CN106441583A - Spectral phase interference device and spectral interferometry system for reconstruction of ultrafast optical field - Google Patents

Abstract

The invention provides a spectral phase interference device and a spectral interferometry system for reconstruction of an ultrafast optical field. The spectral phase interference device and the spectral interferometry system have the advantages that most of key optical elements are designed based on an isosceles right-angle prism, and excessive use of reflective optical elements in existing devices are avoided, so that the device is simplified structurally greatly; owing to the isosceles right-angle prism design, two-dimensional optical stages capable of leading to vibration of optical paths can be reduced, so that the device or the system designed based on the isosceles right-angle prism is higher in stability and compactness.

Description

Spectral phase interference device and spectral interferometry system for reconstructing ultrafast light field

technical field

The invention belongs to the technical field of ultrafast optics, in particular to a spectral phase interference device and a spectral interferometry system for reconstructing an ultrafast light field.

Background technique

Ultrashort laser pulse technology has been widely used in various fields such as physics, chemistry, materials, biomedicine, national defense, and industrial processing. Therefore, the measurement technology of ultrashort pulse laser time/spectral characteristics is very important.

Among the various existing ultrashort pulse measurement techniques, a commonly used technique is the Spectral Phase Coherent Direct Electric Field Reconstruction (SPIDER) technique using traditional spectral shearing interference. This technology can measure the width, shape and phase of optical pulses. Its advantages are: the measurement is carried out in the spectral domain, and no fast-response receiver is needed; the device does not contain any moving components, which is stable and reliable; Real-time detection of repetition rate.

The existing SPIDER technology has relatively poor measurement accuracy for spectra with complex shapes, or spectra with narrow ultrashort pulses. Moreover, the existing devices or systems often use many reflective optical elements, which makes the system structure more complex and reduces the stability and compactness of the system.

Contents of the invention

The invention provides a spectral phase interference device and a spectral interferometry system for reconstructing an ultrafast light field, aiming to solve the problem of low stability and compactness of the spectral phase interference device based on SPIDER technology.

In order to solve the above technical problems, the present invention provides a spectral phase interference device, which includes:

The first beam splitter, the pulse disperser for generating chirped pulses, the first pulse delay line, the 50:50 non-polarizing beam splitter for generating chirped pulse pairs, the second pulse delay line, the second pulse delay line A 180-degree optical path foldback device, a broadband half-wave plate for two-step phase shift measurement, a focusing mirror, a nonlinear sum-frequency crystal, a third pulse delay line for adjusting the relative time delay of the sum-frequency pulse pair, and a second 180-degree optical path return device, first prism reflector, second prism reflector, focusing lens and spectrometer for measuring spectral interference ring;

The pulse disperser, the first pulse delay line, the second pulse delay line, the first 180-degree optical path return device, the third pulse delay line, the second 180-degree optical path return device, the first prism reflector and the first Both prism reflectors are designed based on isosceles rectangular prisms.

Further, the first beam splitter separates the acquired pulse to be measured into a reflected pulse and a transmitted pulse, and outputs the reflected pulse to the first pulse delay line, and outputs the transmitted pulse to the The pulse disperser;

The first pulse delay line is used to delay the reflected pulse and output the delayed reflected pulse to the focusing mirror;

The pulse disperser is used to stretch the transmitted pulse into a chirped pulse, and output the chirped pulse to the non-polarizing beam splitter;

The non-polarizing beam splitter is used to divide the chirped pulse into a first chirped sub-pulse and a second chirped sub-pulse, and output the first chirped sub-pulse to the second pulse delay line, outputting the second chirped sub-pulse to the broadband half-wave plate;

The second pulse delay line is configured to delay the acquired first chirped sub-pulse, and transmit the delayed first chirped sub-pulse to the focusing mirror;

The broadband half-wave plate is used to cause the second chirped sub-pulse to generate a spectral interference ring with a relative π phase shift, and transmit the phase-shifted second chirped sub-pulse to the first 180-degree optical path return device;

The first 180-degree optical path return device is used to reflect the second chirped sub-pulse to the focusing mirror;

The focusing mirror is used to converge the delayed first chirped sub-pulse and the second chirped sub-pulse with the acquired delayed reflected pulse, and inject the converged pulse into the Described nonlinear sum frequency crystal;

The nonlinear sum-frequency crystal is used to perform sum-frequency processing on the converged pulses to generate a first sum-frequency pulse and a second sum-frequency pulse, and transmit the first sum-frequency pulse to the first sum-frequency pulse a prism reflector, and transmitting said second sum frequency pulse to said third pulse delay line;

The first prism reflector is used to reflect the first sum-frequency pulse to the second 180-degree optical path return device;

The second 180-degree optical path return device is used to transmit the first sum-frequency pulse to the focusing lens;

The third pulse delay line is used to delay the second sum frequency pulse and transmit the delayed second sum frequency pulse to the second prism reflector;

The second prism reflector is used to reflect the delayed second sum frequency pulse to the focusing lens;

The focusing lens is used to converge the first sum-frequency pulse and the delayed second sum-frequency pulse, and inject the converged pulse into the spectrometer;

The spectrometer is used for recording the spectral interference ring data of the incident pulse.

Further, the spectrometer is used to record the first spectrum when the broadband half-wave plate is adjusted so that the polarization direction of the second chirped sub-pulse is at a parallel angle to the fast axis direction of the broadband half-wave plate Interference ring data; the spectrometer is used to record the second broadband half-wave plate when the polarization direction of the second chirped sub-pulse is at a vertical angle to the fast axis direction of the broadband half-wave plate. Spectral interference ring data.

Further, the first pulse delay line is composed of two 180° reflective mirror groups, one of the 180° reflective mirror groups is placed on a linear translation platform; each of the 180° reflective mirror groups is It includes two isosceles right-angle prisms, the hypotenuse surfaces of the isosceles right-angle prisms are all coated with 45° high-reflection film, and one of the right-angle adjacent surfaces of the two isosceles right-angle prisms is attached to the same reference plane.

Further, the pulse disperser is composed of a first isosceles right-angle prism and a second isosceles right-angle prism, and the first isosceles right-angle prism is placed on a linear translation stage; the first isosceles right-angle prism and the The hypotenuses of the second isosceles right-angle prism are coated with broadband anti-reflection coating for pulse.

Further, the non-polarizing beam splitter is a 50:50 broadband non-polarizing cubic prism beam splitter, and the non-polarizing beam splitter equally divides the chirped pulse into the first chirped sub-pulse and the second chirped sub-pulse.

Further, the second pulse delay line is composed of a third isosceles right-angle prism placed on a linear translation platform, and the hypotenuse of the third isosceles right-angle prism is coated with zero-degree incident pulse central wavelength Nearby broadband anti-reflection coating; the first 180-degree optical path turnback device is made up of the fourth isosceles right-angled prism, the hypotenuse of the fourth isosceles right-angled prism is coated with a broadband near the central wavelength of the pulse to be measured at zero-degree incident AR coating.

Further, the third pulse delay line is composed of a sixth isosceles right-angle prism placed on a linear translation stage, and the hypotenuse of the sixth isosceles right-angle prism is coated with zero-degree incident sum-frequency pulse central wavelength Nearby broadband anti-reflection coating; the second 180-degree optical path return device is made up of the fifth isosceles right-angled prism, and the hypotenuse of the fifth isosceles right-angled prism is coated with zero-degree incident near the center wavelength of the sum-frequency pulse Broadband anti-reflection coating.

Further, both the first prism reflector and the second prism reflector are composed of isosceles right-angle prisms, and their two right-angle adjacent surfaces are coated with a 45° reflective film for sum-frequency pulses.

The present invention also provides a spectral interferometry system for reconstructing an ultrafast light field comprising the above-mentioned spectral phase interference device.

Compared with the prior art, the present invention has the beneficial effects of:

In the device or system provided by the present invention, most of its key optical elements are designed based on isosceles rectangular prisms, which greatly reduces the use of reflective optical elements in existing devices, thereby greatly simplifying the structure of the entire device. Since the design of the isosceles right-angle prism can reduce the use of two-dimensional optical adjustment mounts that can cause optical path vibrations, the device or system based on the design of the isosceles right-angle prism has higher stability and compactness.

Description of drawings

FIG. 1 is a schematic diagram of a spectral phase interference device provided by an embodiment of the present invention;

Fig. 2 is a schematic diagram of a first pulse delay line provided by an embodiment of the present invention.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

As shown in Figure 1, BS represents the first beam splitter, DL1 represents the pulse delay line, Stretcher represents the pulse disperser, FM represents the focusing mirror, NPS represents the non-polarizing beam splitter, BHW represents the broadband half-wave plate, DL2 represents the second Two-pulse delay line, P4 represents the first 180-degree optical path return device, SHG represents the nonlinear sum frequency crystal, PM1 represents the first prism reflector, DL3 represents the third pulse delay line, P5 represents the second 180-degree optical path return device , Lens means focusing lens, PM2 means second prism reflector, SP means spectrometer, P3 means third isosceles right angle prism, P6 means sixth isosceles right angle prism, P1 means first isosceles right angle prism, P2 means second etc. Waist rectangular prism, M1\M2\M3\M4\M5\M6 all represent reflectors.

The first embodiment of the present invention provides a spectral phase interference device, as shown in Figure 1, the device includes:

The first beam splitter BS, the pulse disperser Stretcher for generating chirped pulses, the first pulse delay line DL1, the 50:50 non-polarizing beam splitter NPS for generating chirped pulse pairs, the second pulse delay Time line DL2, the first 180-degree optical path foldback device P4, a broadband half-wave plate BHW for two-step phase shift measurement, a focusing mirror FM, a nonlinear sum-frequency crystal SHG, and a device for adjusting the relative time delay of the sum-frequency pulse pair The third pulse delay line DL3, the second 180-degree optical path return device P5, the first prism reflector PM1, the second prism reflector PM2, the focusing lens Lens and the spectrometer SP for measuring the spectral interference ring;

Among them, the pulse disperser Stretcher, the first pulse delay line DL1, the second pulse delay line DL2, the first 180-degree optical path return device P4, the third pulse delay line DL3, the second 180-degree optical path return device P5, the second Both the first prism reflector PM1 and the second prism reflector PM2 are designed based on isosceles rectangular prisms. The isosceles right-angle prism can reduce the use of two-dimensional optical adjustment mounts that can cause optical path vibrations, thereby improving the stability of the entire device and making the structure of the entire device more compact.

In the spectral phase interference device provided in this embodiment, the transmission process of the spectrum in the device is as follows:

The first beam splitter BS separates the acquired pulse to be measured into a reflected pulse and a transmitted pulse, and outputs the reflected pulse to the first pulse delay line DL1, and outputs the transmitted pulse to the pulse disperser Stretcher;

The first pulse delay line DL1 is used to delay the reflected pulse and output the delayed reflected pulse to the focusing mirror FM;

The pulse disperser Stretcher is used to stretch the transmitted pulse into a chirped pulse, and output the chirped pulse to the non-polarizing beam splitter NPS;

The non-polarizing beam splitter NPS is used to divide the above-mentioned chirped pulse into a first chirped sub-pulse and a second chirped sub-pulse, and output the first chirped sub-pulse to the second pulse delay line DL2, and divide the second The chirped sub-pulse is output to the broadband half-wave plate BHW;

The second pulse delay line DL2 is used to delay the acquired first chirped sub-pulse, and transmit the delayed first chirped sub-pulse to the focusing mirror FM;

The broadband half-wave plate BHW is used to make the second chirped sub-pulse generate a spectral interference ring with a relative π phase shift, and transmit the phase-shifted second chirped sub-pulse to the first 180-degree optical path return device P4;

The first 180-degree optical path return device P4 is used to reflect the second chirped sub-pulse to the focusing mirror FM;

The focusing mirror FM is used to converge the delayed first chirped sub-pulse and the second chirped sub-pulse with the acquired delayed reflected pulse, and inject the converged pulse into the nonlinear sum frequency crystal SHG ;

The nonlinear sum-frequency crystal SHG is used to perform sum-frequency processing on the above-mentioned converged pulses to generate the first sum-frequency pulse and the second sum-frequency pulse, and transmit the first sum-frequency pulse to the first prism reflector PM1, and transmitting the second sum frequency pulse to the third pulse delay line DL3;

The first prism reflector PM1 is used to reflect the first sum-frequency pulse to the second 180-degree optical path return device P5;

The second 180-degree optical path return device P5 is used to transmit the first sum frequency pulse to the focusing lens Lens;

The third pulse delay line DL3 is used to delay the second sum frequency pulse and transmit the delayed second sum frequency pulse to the second prism reflector PM2;

The second prism reflector PM2 is used to reflect the delayed second sum frequency pulse to the focusing lens Lens;

The focusing lens Lens is used to converge the first sum-frequency pulse and the delayed second sum-frequency pulse, and inject the converged pulse into the spectrometer SP;

The spectrometer SP is used for recording the spectral interference ring data of the incident pulse.

Further, the spectrometer SP is used to record the first spectral interference ring data when adjusting the broadband half-wave plate BHW so that the polarization direction of the second chirped sub-pulse is at a parallel angle to the fast axis direction of the broadband half-wave plate BHW; The spectrometer SP is also used to record the second spectral interference ring data when the broadband half-wave plate BHW is adjusted so that the polarization direction of the second chirped sub-pulse is at a vertical angle to the fast axis direction of the broadband half-wave plate BHW.

Suppose the calculation formula of the _first spectral interference ring data D1 measured by the spectrometer SP is as follows:

D ₁ ＝|E ₁ (ω)| ² +|E ₂ (ω-Ω)| ² +2|E ₁ (ω)E ₂ (ω-Ω)|cos[ωτ+ψ(ω)-ψ(ω -Ω)]

Among them, E represents the electric field, τ represents the time delay between the first sum frequency pulse and the second sum frequency pulse, Ω represents the center frequency difference between the first sum frequency pulse and the second sum frequency pulse, and ψ represents the phase.

Correspondingly, the calculation formula of the _second spectral interference ring data D2 measured by the spectrometer SP is as follows:

D ₂ ＝|E ₁ (ω)| ² +|E ₂ (ω-Ω)| ² -2|E ₁ (ω)E ₂ (ω-Ω)|cos[ωτ+ψ(ω)-ψ(ω -Ω)]

The time (spectrum) amplitude and phase of the ultrashort pulse laser can be obtained by two Fourier transforms, and the calculation formula is as follows:

D ₁ -D ₂ =4|E ₁ (ω)E ₂ (ω-Ω)|cos[ωτ+ψ(ω)-ψ(ω-Ω)]

As shown in Figure 2, the first pulse delay line DL1 is composed of two 180° mirror groups, one of which is placed on a linear translation platform; each 180° mirror group includes two An isosceles right-angle prism, the hypotenuse surface of the isosceles right-angle prism is coated with 45° high-reflection film, and one of the right-angle adjacent surfaces of the two isosceles right-angle prisms is attached to the same reference plane. It should be noted that the first pulse delay line provided by the present invention as shown in FIG. 2 not only has the function of delaying the pulse, but also has the function of simultaneously realizing multiple turns of the optical path. Therefore, by adjusting one of the two 180° mirror groups, the amount of translation in the direction perpendicular to the incident light can control the number of light reentry times, that is, the first pulse delay line DL1 can flexibly control the light in its interior. The number of times of multiple turns makes the structure of the first pulse delay line more compact and has the advantage of flexible adjustment.

The pulse disperser Stretcher consists of the first isosceles right-angle prism P1 and the second isosceles right-angle prism P2, the first isosceles right-angle prism P1 is placed on the linear translation stage; the first isosceles right-angle prism P1 and the second isosceles right-angle prism The P2's hypotenuse faces are coated with a broadband AR coating for pulses. The incident light of the pulse disperser Stretcher provided by the present invention is generally incident at an angle near 0 degree.

The non-polarizing beam splitter NPS is a 50:50 broadband non-polarizing cubic prism beam splitter, and the non-polarizing beam splitter NPS equally divides the chirped pulse into the first chirped sub-pulse and the second chirped sub-pulse pulse. The non-polarizing beam splitter NPS provided by the present invention is designed as a cubic prism structure, in order to divide the incident pulse incident on the non-polarizing beam splitter NPS into two sub-pulses with equal proportions, and the polarization states of the two sub-pulses are the same as The polarization states of the incident pulses are the same.

The second pulse delay line DL2 is composed of the third isosceles right-angle prism P3 placed on the linear translation stage, the hypotenuse of the third isosceles right-angle prism P3 is coated with a broadband amplifier near the central wavelength of the pulse to be measured at zero-degree incident. Permeable membrane. It should be noted that fixing the isosceles rectangular prism on the linear translation stage can make it function as a time delay line. Therefore, in the present invention, the third isosceles right-angle prism P3 is fixed on the linear translation stage, so that it forms a pulse delayer DL2 as a whole, which plays a role of time delay. At the same time, the optical path can be adjusted by translating the third isosceles rectangular prism P3 in the direction of incident light.

In the embodiment of the present invention, the broadband half-wave plate BHW is placed in the chirped pulse optical path. Therefore, the broadband requirement for the phase control of the broadband half-wave plate BHW is relatively low, which is more conducive to the control of the π phase shift in the subsequent process.

The first 180-degree optical path refolder P4 is composed of a fourth isosceles right-angle prism, and the hypotenuse of the fourth isosceles right-angle prism is coated with a broadband anti-reflection coating near the central wavelength of the pulse to be measured with zero-degree incident.

The third pulse delay line DL3 is composed of the sixth isosceles right angle prism P6 placed on the linear translation platform, the hypotenuse of the sixth isosceles right angle prism P6 is coated with a broadband amplifier near the central wavelength of the zero-degree incident sum frequency pulse. Permeable membrane. Fixing an isosceles rectangular prism on a linear translation stage allows it to function as a time delay line. Therefore, in the present invention, the sixth isosceles right-angle prism P6 is fixed on the linear translation stage, so that it forms a pulse delayer DL3 as a whole, which plays a role of time delay. The hypotenuse of the sixth isosceles rectangular prism provided by the present invention is coated with an anti-reflection coating for the sum-frequency pulse, which is mainly used to adjust the relative time delay between the first sum-frequency pulse and the second sum-frequency pulse, Thereby adjusting the density of the spectral interference ring data recorded by the spectrometer in the subsequent process.

The second 180-degree optical path refolder P5 is composed of a fifth isosceles right-angle prism, and the hypotenuse of the fifth isosceles right-angle prism is coated with a broadband anti-reflection coating near the central wavelength of the zero-degree incident sum-frequency pulse. The second 180-degree optical path return device P5 is not only used for returning and transmitting the first sum frequency pulse, but also used for balancing the dispersion of the optical paths of the first sum frequency pulse and the second sum frequency pulse.

Both the first prism reflector PM1 and the second prism reflector PM2 are composed of isosceles right-angle prisms, and their two right-angle adjacent surfaces are coated with a 45° reflection film for sum frequency pulses.

In addition, it should be noted that in the embodiment of the present invention, several reflectors such as M1 to M6 are also applied to play a cooperative role in the device, so that the pulse is reflected to the corresponding position, which will not be described in detail here repeat.

In the simulation experiment of this embodiment, when the pulse to be measured is about 10 femtoseconds, the first beam splitter BS divides the pulse to be measured into two beams, and the reflected pulse is output to the first pulse delayer DL1, and the The transmitted pulse is output to the focusing mirror FM, and the transmitted pulse is output to the pulse disperser Stretcher, and the transmitted pulse is stretched by the pulse disperser Stretcher into a chirped pulse with a time width of about 5 picoseconds. After the chirped pulse passes through the NPS, it is divided into a first chirped sub-pulse and a second chirped sub-pulse. The first chirped sub-pulse is transmitted to the focusing mirror FM through the isosceles right-angle prism P3 placed on a linear translation stage, and the second chirped sub-pulse is transmitted to the focusing mirror through the broadband half-wave plate BHW and the first 180-degree optical path return device P4. Mirror FM. Using an off-axis parabolic mirror as the focusing mirror FM, the above three pulses are incident and focused to the nonlinear sum-frequency crystal SHG, thereby generating the first sum-frequency pulse and the second sum-frequency pulse. In this experiment, the nonlinear sum-frequency crystal SHG is a nonlinear sum-frequency crystal, and a β-BBO crystal with a thickness of about tens of microns can be used. The first type of phase matching can also be used for the second type of phase matching. The spectral shapes of the first and second sum pulses are similar, but the center frequencies are shifted by about 2.5 nm. The first sum frequency pulse then passes through PM1 and P5, while the second sum frequency pulse passes through isosceles rectangular prisms P6 and PM2 placed on a linear translation stage. The relative time delay of the two sum frequency pulses is about 400 femtoseconds. Finally, the two sum-frequency pulses are focused by the lens Lens at the incident slit of the spectrometer SP, and thus received by the spectrometer. During measurement, adjust the broadband half-wave plate BHW so that the polarization direction of its incident pulse is parallel to the fast axis of the wave plate, and the spectrometer SP records the data of the first spectral interference ring; then turn the broadband half-wave plate BHW so that the polarization direction of its incident pulse Perpendicular to the fast axis of the wave plate, the spectrometer SP records the data of the second spectral interference ring. In this experiment, the spectrometer SP is a fiber optic spectrometer with a spectral resolution of about 0.02 nm.

It should be noted that, compared with the prior art, the spectral interference device provided by the present invention records two pieces of spectral interference ring data through a two-step phase-shifting technique, so that the data processing can easily eliminate the DC and AC flow in the traditional device. The impact of time interception brings two benefits: First, when the shape of the measured spectrum is more complex, or the spectrum of the measured ultrashort pulse is narrow and the time is wide, it can effectively avoid the DC flow The overlap with the AC quantity in the time domain effectively broadens the measurable range; secondly, the selected AC component is no longer intercepted by the time window, but by the weighted subtraction of the spectral interference rings measured by two spectrometers with the same performance , can effectively reduce the influence of noise.

In summary, in the device provided by the first embodiment of the present invention, most of its key optical elements are designed based on isosceles rectangular prisms, which greatly reduces the use of reflective optical elements in existing devices, thereby greatly simplifying the structure of the entire device. Since the design of the isosceles right-angle prism can reduce the use of two-dimensional optical adjustment mounts that can cause optical path vibrations, the device or system based on the design of the isosceles right-angle prism has higher stability and compactness.

The second embodiment of the present invention provides a spectral interferometry system for reconstructing an ultrafast light field. The system includes all the components contained in the above-mentioned spectral phase interference device, and has the functions of the above-mentioned spectral phase interference device. I won't go into details here.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention within.

Claims (10)

1. a kind of spectrum phase interference device is it is characterised in that described device includes：

First beam splitter, for producing the type pulse disporsion device of chirped pulse, the first pulse delay line, being used for producing chirped pulse pair 50:50 non-polarizing beamsplitter, the second pulse delay line, the first 180 degree light path turning device, it is used for realizing two step phase-shift measurements Broad band half wave piece, focus lamp, non-linear and frequency crystal, for adjusting and frequency pulse is prolonged to the 3rd pulse of relative time-delay When line, the second 180 degree light path turning device, the first prism reflector, the second prism reflector, condenser lenses and be used for measuring light The spectrogrph of spectrum interference ring；

Described type pulse disporsion device, the first pulse delay line, the second pulse delay line, the first 180 degree light path turning device, the 3rd pulse Delay line, the second 180 degree light path turning device, the first prism reflector and the second prism reflector are based on isosceles right-angle prism It is designed.

2. device as claimed in claim 1 it is characterised in that：

Described first beam splitter, the pulse separation to be measured obtaining is become reflected impulse and transmitted pulse, and by described reflected impulse Export to described first pulse delay line, described transmitted pulse is exported to described type pulse disporsion device；

Described first pulse delay line, is used for making described reflected impulse to produce time delay, and by the reflected impulse of time delay export to Described focus lamp；

Described type pulse disporsion device, is changed into chirped pulse for entering line broadening to described transmitted pulse, and exports chirped pulse to institute State non-polarizing beamsplitter；

Described non-polarizing beamsplitter, warbles subpulse for described chirped pulse is divided into the first subpulse and second of warbling, and Described first subpulse of warbling is exported to described second pulse delay line, the described second subpulse of warbling is exported to described width Band half-wave plate；

Described second pulse delay line, the subpulse of warbling of first for making acquisition produces time delay, and the Zhou by time delay Subpulse of singing transmits to described focus lamp；

Described broad band half wave piece, for making the described second subpulse of warbling produce the spectral interference ring of relatively π phase shift, and by phase shift The subpulse of warbling of second afterwards transmits to described first 180 degree light path turning device；

Described first 180 degree light path turning device, for reflexing to focus lamp by the described second subpulse of warbling；

Described focus lamp, for by the first of described time delay warble subpulse and described second warble subpulse and obtain The reflected impulse of time delay converges, and the pulse after converging is incident to described non-linear and frequency crystal；

Described non-linear and frequency crystal, for carrying out the pulse after described convergence and frequency is processed, to generate first and frequency pulse With second and frequency pulse, and described first and frequency pulse are transmitted to described first prism reflector, and by described second and frequency Pulse is transmitted to described 3rd pulse delay line；

Described first prism reflector, for by described first and frequency pulse-echo to described second 180 degree light path turning device；

Described second 180 degree light path turning device, for transmitting described first and frequency pulse to described condenser lenses；

Described 3rd pulse delay line, is used for making described second and frequency pulses generation time delay, and by the second of time delay and frequency arteries and veins Punching is transmitted to described second prism reflector；

Described second prism reflector, for by the second of described time delay and frequency pulse-echo to described condenser lenses；

Described condenser lenses, for converging second and the frequency pulse of described first and frequency pulse and described time delay, and will converge Pulse after poly- is incident to described spectrogrph；

Described spectrogrph, for by the spectral interference loop data record of incident pulse.

3. device as claimed in claim 1 or 2 it is characterised in that：

Described spectrogrph, for adjust described broad band half wave piece, make described second warble subpulse polarization direction with described When the quick shaft direction of broad band half wave piece is in parallel angle, record the first spectral interference loop data；

Described spectrogrph, for adjust described broad band half wave piece, make described second warble subpulse polarization direction with described When the quick shaft direction of broad band half wave piece is in vertical angle, record the second spectral interference loop data.

4. device as claimed in claim 1 or 2 is it is characterised in that described first pulse-delay line is by two 180 ° of catadioptric mirrors Group composition, one of described 180 ° of catadioptric microscope groups are placed in and linearly move on translation stage；

Each described 180 ° of catadioptric microscope group all comprises two isosceles right-angle prisms, and the hypotenuse surface of described isosceles right-angle prism all plates There are 45 ° of high-reflecting films, and one of right angle proximal surface of two described isosceles right-angle prisms is all labelled on same datum level.

5. device as claimed in claim 1 or 2 it is characterised in that described type pulse disporsion device by the first isosceles right-angle prism and Second isosceles right-angle prism group becomes, and described first isosceles right-angle prism is placed on linear translation platform；

Described first isosceles right-angle prism is all coated with the broadband increasing for pulse with the inclined edge surfaces of described second isosceles right-angle prism Permeable membrane.

6. device as claimed in claim 1 or 2 is it is characterised in that described non-polarizing beamsplitter is 50:50 broadband is unpolarized Block prism beam splitter, described chirped pulse is divided into described first and warbles subpulse and described the by described non-polarizing beamsplitter Two warble subpulse.

7. device as claimed in claim 1 or 2 is it is characterised in that described second pulse delay line is by being placed in linear translation platform On third class waist corner cube prism composition, the inclined edge surfaces of described third class waist corner cube prism are coated with the incident pulse to be measured of zero degree Broadband anti-reflection film near centre wavelength；

Described first 180 degree light path turning device is made up of the 4th isosceles right-angle prism, the hypotenuse of described 4th isosceles right-angle prism Face is coated with the broadband anti-reflection film near the incident pulse center wavelength to be measured of zero degree.

8. device as claimed in claim 1 or 2 is it is characterised in that described 3rd pulse delay line is by being placed in linear translation platform On the 6th isosceles right-angle prism group become, the inclined edge surfaces of described 6th isosceles right-angle prism are coated with zero degree incident and frequency pulse Broadband anti-reflection film near centre wavelength；

Described second 180 degree light path turning device is become by the 5th isosceles right-angle prism group, the hypotenuse of described 5th isosceles right-angle prism Be coated with face zero degree incident and the broadband anti-reflection film near frequency pulse center wavelength.

9. device as claimed in claim 1 or 2 is it is characterised in that described first prism reflector is anti-with described second prism Emitter is become by isosceles right-angle prism group, and is all coated with for 45 ° of reflectance coatings with frequency pulse on two right angle proximal surface.

10. a kind of spectral interference measuring system rebuilding ultrafast light field is it is characterised in that described system is included as claim 1- Spectrum phase interference device any one of 9.