CN204885804U - A narrow linewidth beam combining module and a multi-wavelength Raman laser with the module - Google Patents
A narrow linewidth beam combining module and a multi-wavelength Raman laser with the module Download PDFInfo
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- CN204885804U CN204885804U CN201520530339.2U CN201520530339U CN204885804U CN 204885804 U CN204885804 U CN 204885804U CN 201520530339 U CN201520530339 U CN 201520530339U CN 204885804 U CN204885804 U CN 204885804U
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Abstract
The utility model provides a multi -wavelength raman laser who restraints module and have this module is closed to narrow linewidth. The narrow linewidth is closed bundle module and is had first laser instrument, a fast axis collimating lens, first wavelength locking device, second laser instrument, the 2nd fast axis collimating lens, second wavelength locking device and slow axis collimating lens, the wavelength of first laser instrument and second laser instrument is different, two laser instruments have the one side of PN junction just close as far as to just mutually, the light that first and second laser instruments sent is carried out the fast axis collimation by corresponding fast axis collimating lens respectively after carry out the narrow linewidth light beam that the wavelength locking formed two fast axis collimations by respective wavelength locking device, the narrow linewidth light beam of these two bundles of fast axis collimations incides same slow axis collimating lens more simultaneously and carries out the slow axis collimation, finally form two bundles of narrow linewidth collimated beams that are parallel to each other. Multi -wavelength raman laser has a plurality of above -mentioned narrow linewidths and closes and restraint the module, closes the close shu guang of narrow linewidth collimated light synthesis for being parallel to each other who restraints outgoing in the module through closing shujing with a plurality of narrow linewidths, closes light beam after restrainting and is assembled by focusing lens and accomplish the coupling on the output optical fibre terminal surface that forms images. The structure of restrainting the module is closed to above -mentioned narrow linewidth makes the emergent light can directly go into to peer into during the focusing lens coupling goes into optic fibre, has removed the light beam and has closed and restraint must be through the mode of closing shu jing, multi -wavelength raman laser's structure has reduced the whole of laser instrument and has adjusted the degree of difficulty, has reduced optical device's use quantity, has still strengthened the flexibility of laser instrument inner structure design under the prerequisite of having guaranteed enough stability.
Description
Technical field
The utility model relates to field of lasers, particularly relates to the wavelength Raman laser that a kind of narrow linewidth is closed bundle module and had this module.
Background technology
In industry, medical science and scientific research field, use the laser of multi-wavelength as work light widely, these light often need to switch fast or use simultaneously, and have higher requirement to the spectral width of LASER Light Source, but do not allow in a lot of situation to change laser in the middle of reality uses or the operating time very of short duration, this just needs the semiconductor laser providing a multi-wavelength narrow linewidth.
Traditional technical scheme is that each comfortable quick shaft direction of light beam of the different wave length sent by multiple chip of laser in coupling optical path and slow-axis direction collimate, and then closes bundle for coaxial light beam through light combination mirror, then is coupled into an optical fiber through condenser lens.In this scheme, because laser is all independently optical path unit, so the synthesis of each laser beam needs independently light combination mirror to carry out conjunction bundle.Because each laser is independently unit, so the number of optical devices of overall laser is more, regulate difficulty large, overall stability is lower; In addition, along with going deep into of laser application field, sometimes need there is higher requirement to the spectral width of LASER Light Source.For above-mentioned technical scheme, multiple optical device unit mutually between the reflection of light beam and interference can affect the width of spectrum, the quantity of device also considerably increases the cost of product, limits stability and the industrialization of laser spectrum.
Summary of the invention
For above-mentioned technical problem, the utility model provides a kind of narrow linewidth and closes bundle module and have the wavelength Raman laser of this module.
Described narrow linewidth closes bundle module, have first auxiliary heat sink, first laser, first fast axis collimation lens, first wave length locked plug-in unit, second is auxiliary heat sink, second laser, second fast axis collimation lens, second wave length locked plug-in unit and slow axis collimating lens, first laser and first wave length locked plug-in unit be fixed in first auxiliary heat sink on, second laser and second wave length locked plug-in unit be fixed in second auxiliary heat sink on, first auxiliary heat sink and the second auxiliary heat sink stepped hole all had for assembling, utilize screw auxiliary heat sink and second assist and be heat sinkly connected and fix by first by described stepped hole, described first laser is different with the wavelength of second laser, two lasers have the one side of PN junction to face mutually and close as much as possible, through carrying out by first wave length locked plug-in unit the narrow linewidth light beam that wavelength locking forms the first fast axis collimation after the light that first laser sends is carried out fast axis collimation by the first fast axis collimation lens, through carrying out by second wave length locked plug-in unit the narrow linewidth light beam that wavelength locking forms the second fast axis collimation after the light that second laser sends is carried out fast axis collimation by the second fast axis collimation lens, the narrow linewidth light beam of this two bundles fast axis collimation incides same slow axis collimating lens more simultaneously and carries out slow axis collimation, the narrow linewidth collimated light beam be parallel to each other is restrainted in final formation two.
Wherein, two described laser relative primary optical axis are that axial symmetry is placed, the optical axis of the light that two lasers send is parallel with primary optical axis but not coaxial, two lasers have the side of PN junction to face the both sides being placed on primary optical axis, and the luminous zone of laser is in the same plane perpendicular to primary optical axis.
Wherein, first is auxiliary heat sink and second assist and heat sinkly have three ledge surfaces respectively, described first laser and first wave length locked plug-in unit are installed in first respectively and assist on heat sink second step surface and the 3rd ledge surface, described second laser and second wave length locked plug-in unit are installed in second respectively and assist on heat sink second step surface and the 3rd ledge surface, assist heat sink first step surface relative com pact to be sticked for two and put.
Wherein, described laser by soldering or direct sintering be arranged on auxiliary heat sink on.
Wherein, described wavelength locking device can be Volume Bragg grating, balzed grating, or plane grating.
Wherein, described module has coupling unit, and described coupling unit has condenser lens and receives optical fiber, and two restraint the incident end face inciding after the narrow linewidth collimated light beam be parallel to each other is focused on by condenser lens and receive optical fiber.
Wherein, the optical axis of described condenser lens and primary optical axis coaxial.
Wherein, described condenser lens is sphere, aspheric surface or GRIN Lens.
Wherein, described fiber end face through grinding and polishing, and is coated with anti-reflection film.
The utility model additionally provides a kind of wavelength Raman laser, there is multiple above-mentioned narrow linewidth and close bundle module and multiple light combination mirror, the narrow linewidth collimated light beam that described multiple narrow linewidth closes the outgoing of bundle module closes the conjunction Shu Guang of bundle for being parallel to each other by light combination mirror, closes the light beam after bundle and is assembled by the condenser lens in above-mentioned coupling unit on the incident end face that is imaged onto and receives optical fiber and complete coupling.
Wherein, the quantity of described light combination mirror is less than or equal to the quantity that described narrow linewidth closes bundle module.
Wherein, described light combination mirror is dichroscope, Dove prism or X prism.
Wherein, the exit end that described multiple narrow linewidth second narrow linewidth of closing in bundle module closes bundle module to the n-th narrow linewidth conjunction bundle module all respectively establishes a light combination mirror, wherein n is the quantity that narrow linewidth closes bundle module, the emergent light that first narrow linewidth closes bundle module is directly transmitted to the light combination mirror being positioned at the second narrow linewidth conjunction bundle module exit end, described light combination mirror is all coated with filter coating, and described filter coating can reflect its corresponding narrow linewidth and closes the wavelength of bundle module and be transmitted into the wavelength being incident upon light combination mirror.
Wherein, the exit end that each narrow linewidth closes bundle module is equipped with light combination mirror, and described light combination mirror is all coated with filter coating, and described filter coating can reflect its corresponding narrow linewidth and closes the wavelength of bundle module and be transmitted into the wavelength being incident upon light combination mirror.
Wherein, described wavelength Raman laser also comprises one or more in thermoelectric refrigerating unit, thermistor, photodetector.
Pass through two sublaser chips in the utility model just to the structure of installing, relieve two sublasers and close the restriction that Shu Bixu uses light combination mirror or speculum, the position that in this module, laser is installed is very close, the collimated light of outgoing is near primary optical axis and be parallel to each other, do not need to carry out conjunction bundle by light combination mirror to light beam again, directly can focus on the enterprising line output of fiber end face by scioptics.Thus reduce the difficulty that laser debugs, and obtain enough spaces and in coupling optical path, insert some extra optics to realize the more application function of laser, enhance the flexibility of laser internal structure design, and, because two sublaser luminous zones are at same plane, its light path is identical, therefore same slow axis collimating lens can also be used to collimate, when reaching same coupling efficiency and output facula, save the usage quantity of optics, farthest reduce production cost and improve production efficiency.
According to wavelength Raman laser of the present utility model, employ narrow linewidth close bundle module array structure, relieve laser need and light combination mirror limit one to one.This laser two wavelength use same light combination mirror, decrease usage quantity and the plated film difficulty of light combination mirror, effectively control the kind and quantity that use device, and, the independence relative due to module and compact conformation, higher manufacturability and repeatability can be ensured debuging in process, ensure the consistency of product and efficient production efficiency.
Accompanying drawing explanation
Can to be described in detail by following utility model and institute's accompanying drawings is further understood about advantage of the present utility model and spirit.
Fig. 1 is the light path schematic diagram closing bundle module according to the narrow linewidth of the utility model embodiment.
Fig. 2 is the structural representation closing bundle module according to the narrow linewidth of the utility model embodiment.
Fig. 3 is the coupling unit light path schematic diagram of the narrow linewidth module according to the utility model embodiment.
Fig. 4 is the structural representation of the coupling unit of narrow linewidth module according to the utility model embodiment.
Fig. 5 is the light path schematic diagram of the wavelength Raman laser according to the utility model embodiment.
Fig. 6 is the structural representation of the wavelength Raman laser according to the utility model embodiment.
In figure: 1-1,2-1 are for auxiliary heat sink, 1-2 is the first chip of laser, 2-2 is second laser chip, 1-3,2-3 are fast axis collimation lens, and 1-4,2-4 are wavelength locking device, and 1-5 is slow axis collimating lens, 1-6 is condenser lens, 1-7 is optical fiber, and 1-8 is light combination mirror, and 1-9 is that base plate is heat sink.
Embodiment
Specific embodiment of the utility model is described in detail below in conjunction with accompanying drawing.
Figure 1 shows that the light path schematic diagram closing bundle module according to narrow linewidth of the present utility model, Figure 2 shows that the structural representation of this module.This module has the first auxiliary heat sink 1-1, the second auxiliary heat sink 2-1, the first chip of laser 1-2, second laser chip 2-2, the first fast axis collimation lens 1-3, the second fast axis collimation lens 2-3, first wave length locked plug-in unit 1-4, second wave length locked plug-in unit 2-4 and slow axis collimating lens 1-5.First auxiliary heat sink 1-1 has three ledge surfaces, first chip of laser 1-2 is installed in the second step of the first auxiliary heat sink 1-1 on the surface, first fast axis collimation lens 1-3 is installed in the front end of the first chip of laser 1-2, and first wave length locked plug-in unit 1-4 is installed on the 3rd ledge surface of the first auxiliary heat sink 1-1; Second laser chip 2-2, second wave length locked plug-in unit 2-4 are mounted respectively in the same way on the second step surface and the 3rd ledge surface of the second auxiliary heat sink 2-1, and the second fast axis collimation lens 2-3 is installed in the front end of second laser chip 2-2.First auxiliary heat sink 1-1 can be mounted together in the relative mode be close in both first steps surface with the second auxiliary heat sink 2-1, such as, the auxiliary heat sink 2-1 of first auxiliary heat sink 1-1 and second can have a stepped hole respectively, the auxiliary heat sink 2-1 of the first auxiliary heat sink 1-1 and second being separately installed with chip of laser utilizes screw to be installed together by stepped hole, both first step surfaces are close to relatively, and slow axis collimating lens 1-5 is positioned at the end of the auxiliary heat sink 2-1 of the mounted first auxiliary heat sink 1-1 and second.The first light beam sent from the first chip of laser 1-2 completes after fast axis collimation through the first fast axis collimation lens 1-3 and incides first wave length locked plug-in unit 1-4, thus forms the narrow linewidth light beam of the first fast axis collimation; The second light beam sent from second laser chip 2-2 and the first light beam are parallel to each other, and the second light beam completes after fast axis collimation through the second fast axis collimation lens 2-3 and incides on second wave length locked plug-in unit 2-4, thus form the narrow linewidth light beam of the second fast axis collimation; The narrow linewidth light beam of the first fast axis collimation and the narrow linewidth light beam of the second fast axis collimation are parallel to each other, the symmetrical both sides being distributed in primary optical axis, and incide in slow axis collimating lens 1-5 simultaneously, and the narrow linewidth collimated light beam be parallel to each other is restrainted in last outgoing two.First chip of laser 2-1 can not be identical with the outgoing wavelength of second laser chip 2-2, the optical axis of both emergent lights is parallel with primary optical axis but not coaxial, the side that two chip of laser have PN junction faces the both sides being placed on primary optical axis, its luminous zone is perpendicular to primary optical axis, and two chip of laser become axial symmetry relative to primary optical axis, spacing is between the two little as much as possible.Two chip of laser can by soldering or direct sintering on auxiliary heat sink.Described wavelength locking device can be Volume Bragg grating, balzed grating, or plane grating etc.
Described two bundle narrow linewidth collimated light beams are coupled in optical fiber by coupling unit.Figure 3 shows that the light path schematic diagram be coupled is carried out in utilization according to the coupling unit of narrow linewidth module of the present utility model, Figure 4 shows that the structural representation of this coupling unit.Through the narrow linewidth collimated light beam that two bundles of above-mentioned narrow linewidth conjunction bundle module outgoing are parallel to each other, be directly incident in condenser lens 1-6, beams converge after condenser lens 1-6 focuses on is on the end face of optical fiber 1-7, the size of its hot spot is not more than optical fiber core diameter, the angle of divergence is less than angle corresponding to fiber numerical aperture, to realize efficient coupling.Described condenser lens can be sphere, aspheric surface or GRIN Lens.The end face of described optical fiber can be polished and polishing, and is coated with anti-reflection film.
Adopt this two chip of laser just to the structure of installing, relieve two lasers and close the restriction that Shu Bixu uses light combination mirror or speculum, the position of installing due to two chip of laser is very close, the collimated light of outgoing is near primary optical axis and be parallel to each other, do not need to carry out conjunction bundle by light combination mirror to light beam again, directly can focus on the enterprising line output of fiber end face by scioptics.Thus reduce the difficulty that laser debugs, and obtain enough spaces and in coupling optical path, insert some extra optics to realize the more application function of laser, enhance the flexibility of laser internal structure design, and, because two sublaser luminous zones are at same plane, its light path is identical, therefore same slow axis collimating lens can also be used to collimate, when reaching same coupling efficiency and output facula, save the usage quantity of optics, farthest reduce production cost and improve production efficiency.
Above-mentioned narrow linewidth closes the building block that bundle module can be used as wavelength Raman laser, Figure 5 shows that the light path schematic diagram according to wavelength Raman laser of the present utility model, Figure 6 shows that the structural representation of above-mentioned wavelength Raman laser.As shown in Figure 5, multiple narrow linewidth being closed bundle module is arranged on the heat sink 1-9 of base plate, the exit end that each narrow linewidth closes bundle module is provided with a light combination mirror 1-8, the narrow linewidth collimated light beam closing the outgoing of bundle module from each narrow linewidth closes bundle by light combination mirror, and be incident to condenser lens 1-6, coupling output on the end face converging to optical fiber 1-7 after condenser lens 1-6 focuses on.Wherein, the output wavelength of preferred each chip of laser is different, more preferably in each narrow linewidth conjunction bundle module, the wavelength of laser equidistantly arranges according to order overlapping alignment from small to large or from big to small, makes light beam close bundle for concentrated collimated light beam by adjusting each light combination mirror 1-8.Certainly, the quantity of light combination mirror also can be less than the quantity that narrow linewidth closes bundle module, such as, be directly incident on the modes such as the light combination mirror of the second conjunction bundle module by the emergent light making the first narrow linewidth close bundle module, make the quantity of light combination mirror be less than narrow linewidth and close the quantity of restrainting module.
Described light combination mirror can be dichroscope, Dove prism, X prism etc., it can be coated with filter coating, makes light combination mirror 1-8 can reflect corresponding narrow linewidth and closes the optical wavelength of bundle module outgoing and transmission from the optical wavelength that adjacent light combination mirror 1-8 reflects and transmission is come.Such as, the wavelength of laser is followed successively by λ 1, λ 2, λ 3, λ 4 λ n-1, λ n, λ n+1, λ n+2, and the wavelength that corresponding first narrow linewidth closes bundle module is λ 1, λ 2, then light combination mirror plated film demand fulfillment, and λ 1 ~ λ 2 reflects; It is λ 3, λ 4 that second narrow linewidth closes the wavelength restrainting module, light combination mirror plated film demand fulfillment, and λ 3 ~ λ 4 reflects, λ 1 ~ λ 2 transmission, the like n-th narrow linewidth close bundle module wavelength be λ n, λ n+1, light combination mirror plated film demand fulfillment, λ n ~ λ n+1 reflects, λ 1 ~ λ n-1 transmission.
Above-mentioned wavelength Raman laser also can comprise in thermoelectric refrigerating unit, thermistor, photodetector one or more; These devices can be directly installed on base plate heat sink on.
This use narrow linewidth closes the wavelength Raman laser that bundle module array is formed, and the laser needs and the light combination mirror that relieve each wavelength limit one to one.This laser two wavelength use same light combination mirror, decrease usage quantity and the plated film difficulty of light combination mirror, effectively control the kind and quantity that use device, and, the independence relative due to module and compact conformation, higher manufacturability and repeatability can be ensured debuging in process, ensure the consistency of product and efficient production efficiency.
Just preferred embodiment of the present utility model described in this specification, above embodiment is only in order to illustrate the technical solution of the utility model but not to restriction of the present utility model.All those skilled in the art comply with design of the present utility model by the available technical scheme of logical analysis, reasoning, or a limited experiment, all should within scope of the present utility model.
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