CN1317856A - Excited coupling resonance-cavity laser - Google Patents
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- CN1317856A CN1317856A CN 01102490 CN01102490A CN1317856A CN 1317856 A CN1317856 A CN 1317856A CN 01102490 CN01102490 CN 01102490 CN 01102490 A CN01102490 A CN 01102490A CN 1317856 A CN1317856 A CN 1317856A
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Abstract
An excited coupling laser device with resonance cavity is composed of excited coupling cavity, element in said cavity (or not), laser working medium, output lens of resonance cavity, and pump system. By the different combination of excited coupling cavity and said output lens, it has different functions such as seed implantation, regeneration amplification, etc., and high output power and light beam quality.
Description
The present invention relates to a kind of laser of novel resonant cavity.Especially no matter a kind of being applicable to is continuous operation, or high power (energy) the solid excited coupling resonance-cavity laser of pulsed operation (long pulse, the work of Q-switch).In principle, this resonant cavity also is suitable for the laser of other types, as the application of gas laser, liquid laser, chemical laser, fiber laser etc.
A main direction of laser technology development for a long time is to require to obtain when obtaining high power output (energy) high beam quality.To this, two kinds of technical schemes are arranged at present:
First kind of scheme is to obtain the laser output of high light beam qualities by technology such as modeling (transverse mode, longitudinal mode), injection seeds.
Second kind of scheme is, adopt local oscillator-amplification system, promptly, the first order of system (local oscillator level) is only pursued beam quality, and the size of the efficient of laser, power output (energy) etc. are as emphasis, and obtain big power output (energy) by multistage amplification after the first order of system.The progression of required amplifier is then decided by the output size and the final great power of output (energy) that requires of local oscillator level.Cause the amplifier self-excitation for fear of interstage coupling, just need to strengthen each inter-stage distance, adopt isolator, as relay optical system etc.In order to reduce the beam aberration that amplifying stage causes, also need to adopt technology such as phase conjugation sometimes.
All there are some great shortcomings in above-mentioned two kinds of schemes.For example,
For first scheme, adopt modeling technology such as (transverse mode, longitudinal modes) can obtain high beam quality, but they are cost with the power (energy) of sacrificing output laser all.So efficient, the power output (energy) of single mode (transverse mode, longitudinal mode) laser are all lower than the multimode laser.If increase the output of laser, then become multimode operation, beam quality will reduce greatly.
For alternative plan, adopt local oscillator-amplification system can obtain high power output (energy) and high beam quality simultaneously, for example, Randall J.St.Pierre waits people (" SPIE ", Vol.3264,1998) adopt this scheme when work repetition rate 100Hz, obtain each pulse energy 9.4J, average output power 940W, 2 times of diffraction limits.But there are two major defects in it:
(1) because progression increases, and the volume of system increases, stability, reliability reduce.Therefore can not be used for the military laser system that requirement is small-sized, firm, can work under adverse circumstances.
(2) because the gain of continuously operating laser is low, the efficient of its amplifying stage will be very low.Therefore this scheme can not be used for the laser system of requirement continuous operation.
Therefore, the objective of the invention is to propose the different new laser of a kind of and existing laser, because described laser combines Ultrashort cavity, the technology such as seed, regenerative amplification, coupling cavity of injecting together.Therefore, when obtaining high-output power (energy), can obtain high light beam quality, high efficiency.Described laser no longer needs to increase amplifying stage in addition, so structure is small and exquisite, firm, and reliability and stability improve greatly.Owing to have from injecting the function of seed, so can be used in the laser system of continuous operation.
No matter the present invention as embodiment, because this novel excited coupling resonance-cavity laser is specially adapted to high power (energy) solid state laser, is continuous operation with solid state laser, or pulsed operation (long pulse, the work of Q-switch) all is suitable for.Certainly, its principle also is suitable for the laser in other types, as the application in gas laser, liquid laser, chemical laser, the fiber laser etc.
Fig. 1 represents structural representation of being excited the coupling cavity laser of the present invention;
Fig. 2 represents the structural representation of traditional laser;
Fig. 3 represents the structural representation of traditional local oscillator one structure for amplifying system;
What Fig. 4 represented first embodiment of the invention is excited coupling cavity laser structure schematic diagram;
What Fig. 5 represented second embodiment of the invention is excited coupling cavity laser structure schematic diagram;
What Fig. 6 represented third embodiment of the invention is excited coupling cavity laser structure schematic diagram;
What Fig. 7 represented fourth embodiment of the invention is excited coupling cavity laser structure schematic diagram;
What Fig. 8 represented fifth embodiment of the invention is excited coupling cavity laser structure schematic diagram;
What Fig. 9 represented sixth embodiment of the invention is excited coupling cavity laser structure schematic diagram;
Below in conjunction with accompanying drawing and each embodiment the structure and the course of work of being excited the coupling cavity laser of the present invention is described in detail.
Below description all be to be example with Nd:YAG (yttrium-aluminium-garnet of Nd ion doped) working-laser material, but the invention is not restricted to Nd:YAG, other solid laser working substances, for example Nd:YLF, Nd:YVO
4, Yb:YAG, N d:YAP, glass etc. is all suitable fully.On the principle, also be applicable to operation materials such as gas, liquid, semiconductor.
At first, referring to Fig. 2, it is a kind of structural representation of traditional laser.This laser normally by the chamber mirror 1,4 of resonant cavity, form in operation material 3, pumping system 5 and the chamber by element 2.
Add etalon, grating or adopt method such as pre-laser can obtain single longitudinal mode laser output, but can not obtain the single longitudinal mode operation of 100% probability, output laser energy (power) is also little.
The employing Ultrashort cavity can obtain the single longitudinal mode operation of 100% probability, but (for example, for the Nd:YAG laser, length＜1mm), therefore, operation material is also very short to require the chamber, and this exports with regard to impossible high-energy (power) laser that obtains owing to the long too weak point in chamber.
Shown in Figure 3 is a kind of local oscillator-amplification laser system, and this laser system is by main shaking, power amplifier, partly forming as unify phase-conjugate mirror etc. of relay optical system.Each parts shown in the figure are respectively: main oscillations laser 9, beam shaping telescope 10, faraday isolator 11,45 ° of all-dielectric film mirrors 12,14,17,18,21,23 are as relaying telescope 13,19,22,25, frequency multiplication assembly 15, first, second, third grade of amplifier 16,20,24, wave plate 26, lens 27, excited Brillouin box 28.Shown main oscillations laser is a unsteady cavity, the reflectivity-variable output coupling mirror, and inject continuous single longitudinal mode seed, therefore obtain single transverse mode, the single longitudinal mode laser of high light beam quality.To improve output energy (power), the distortion of amplifying stage is proofreaied and correct by SBS through multistage amplification (three grades of amplifications for example adopting among the figure) in the output of main oscillations laser.By reducing diffraction loss as relay optical system, isolating amplifying stage, suppress amplified spont-aneous emission and parasitic oscillation and reduce the destruction that spike may cause.Adopt this laser system, can obtain very high beam quality and very big laser output energy (power) simultaneously, but its shortcoming is that system is huge, complicated, is difficult in use under the abominable external field environment, and required expense costliness.
Therefore, the present invention is directed to existing deficiency in the prior art, and under abominable external field environment, use, proposed the coupling cavity laser of being excited of the present invention in order to be suitable for.
Fig. 1 is a structural representation of being excited the coupling cavity laser of the present invention.Described laser by resonant cavity after mirror 1, element in the chamber (diaphragm, Q-switch etc.) 2, working-laser material 3, laser resonant cavity outgoing mirror 4, pumping system 5 is formed.Wherein, mirror 1 itself is the microlaser (perhaps can be used as the part of coupling cavity laser) of a high light beam quality behind the described resonant cavity, and pump light is I
P, by being excited coupling cavity output seed laser I
S, laser output laser is I
L
In the present invention, as mirror 1 behind the mirror behind the resonant cavity of laser resonant cavity, it has chamber mirror M1, and M2 itself is the microlaser of a high light beam quality, and both as the back mirror of laser resonant cavity, also conduct produced seed laser I for it
SLaser.
In Fig. 1, mirror 1 end face M2 and outgoing mirror 4 constitute the resonant cavity of lasers behind the resonant cavity, or the part of amplifier or coupling cavity.5 pairs of working-laser materials of pumping system 3 carry out pumping, when pump intensity surpasses certain value, then form laser or seed laser is amplified, at last from output cavity mirror 4 output high light beam qualities, high power (energy) laser I
L
In the present invention, mirror 1 behind the described resonant cavity, and the material that it adopts is operation material 3 (for example, Nd:YAG, Nd:YLF, a Nd:YVO with main laser
4, Yb:YAG, Nd:YAP, glass etc.) crystal of from 0.5 to 10 millimeter of identical, length.But it can also mix in the operation material with main laser different, special impurity and (for example, mix the Cr of 1at.%
4+Deng), the geometry of described operation material can be garden rod, plate-like, sheet, bulk, lath, optical fiber etc.
Directly the chamber mirror both ends of the surface of mirror 1 plate high-intensity deielectric-coating behind resonant cavity, with the chamber mirror M1 of mirror 1 behind the formation resonant cavity, M2.Chamber mirror M1 grows tall instead (R＞99.9%) to the work laser wave, and simultaneously to pump light wavelength high saturating (T＞85%).Chamber mirror M2 is to work optical maser wavelength partial reflection, its reflectivity R ≈ 5～99%, and it is decided by the concrete application requirements of laser.M2 also can be an independent outgoing mirror.And, can be at M1, insert the element that needs in the resonant cavity that M2 constitutes.Mirror 1 is excited itself behind the resonant cavity, and is a whole cavity laser (according to the structure of M1, M2, mirror 1 also can be the disengagement chamber laser behind the resonant cavity).Form loss grating (or owing to being Ultrashort cavity) owing to mixing, it exports single longitudinal mode laser high light beam quality, 100% probability.And its output becomes the seed of chamber mirror M2, outgoing mirror 4 formation main lasers just.Therefore, chamber mirror M1, M2, outgoing mirror 4 constitute injection seeds chamber laser again.As the case may be, M2,4 can be a laser, also can be regenerative amplifier, multipass amplifier etc.In addition, the reflectivity of control chamber mirror M2 (for example R ≈ 50%, or lower) makes in chamber mirror M1, the M2 and can not form laser generation, and chamber mirror 1 just becomes the part of coupling cavity laser.Constitute the coupling cavity laser by mirror behind the resonant cavity 1 with outgoing mirror 4, it has the adjustable within the specific limits characteristic of pulsewidth.This multi-functional combination increases beam quality improvement, efficient raising, stability, the reliability of whole laser.
For being excited the coupling cavity laser, can adopt the chamber mirror M1 and the M2 of different size according to needs to the performance requirement of whole laser and output.For example,
Chamber mirror M1 can be concave surface, plane, convex surface.
Chamber mirror M2 can be concave surface, plane, convex surface.
Fig. 1, Fig. 4～Fig. 9 are several exemplary embodiments of laser.
Among Fig. 1, constitute Ping-Ping metastable resonators, the seed laser I of its output high light beam quality by chamber mirror M1-M2
SBy amplifying or the mode competition effect, (regeneration) amplification in the Ping that is made of M2, output cavity mirror 4-Ping metastable resonators is at last from output cavity mirror 4 output high light beam qualities, high power (energy) laser I
L
In first embodiment shown in Figure 4, constitute Ping-Ping metastable resonators by chamber mirror M1-M2, the seed laser I of its output high light beam quality
sBy amplifying or the mode competition effect, (regeneration) amplification in the flat-recessed stable cavity that is made of M2, output cavity mirror 4 is at last from output cavity mirror 4 output high light beam qualities, high power (energy) laser I
L
Among first embodiment shown in Figure 4, chamber mirror 4 can also be a convex surface, is made of flat-protruding unsteady cavity structure chamber mirror M2, output cavity mirror 4.So, the high light beam quality seed laser I that exports in the Ping-Ping metastable resonators laser that constitutes by chamber mirror M1-M2
S, by amplifying or the mode competition effect, (regeneration) amplification in flat-protruding stable cavity that chamber mirror M2, outgoing mirror 4 constitute is at last from output cavity mirror 4 output high light beam qualities, high power (energy) laser I
L
Among second embodiment shown in Figure 5, constitute flat-recessed stable cavity, the seed laser I of its output high light beam quality by chamber mirror M1-M2
SBy amplifying or the mode competition effect, (regeneration) amplification in flat-protruding unsteady cavity that chamber mirror M2, output cavity mirror 4 constitute is at last from output cavity mirror 4 output high light beam qualities, high power (energy) laser I
L
Among the 3rd embodiment shown in Figure 6, constitute flat-recessed stable cavity, the seed laser I of its output high light beam quality by chamber mirror M1-M2
SBy amplifying or the mode competition effect, (regeneration) amplification in the male-female pseudo confocal unsteady resonator that chamber mirror M2, output cavity mirror 4 constitute is at last from output cavity mirror 4 output high light beam qualities, high power (energy) laser I
L
Among the 4th embodiment shown in Figure 7, constitute flat-protruding unsteady cavity, the seed laser I of its output high light beam quality by chamber mirror M1-M2
SBy amplifying or the mode competition effect, (regeneration) amplification in Ping-Ping metastable resonators that chamber mirror M2, output cavity mirror 4 constitute is at last from output cavity mirror 4 output high light beam qualities, high power (energy) laser I
L
Among the 5th embodiment shown in Figure 8, constitute flat-protruding unsteady cavity, the seed laser I of its output high light beam quality by chamber mirror M1-M2
SBy amplifying or the mode competition effect, (regeneration) amplification in flat-recessed stable cavity that chamber mirror M2, output cavity mirror 4 constitute is at last from output cavity mirror 4 output high light beam qualities, high power (energy) laser I
L
Among the 6th embodiment shown in Figure 9, constitute recessed-protruding unsteady cavity, the seed laser I of its output high light beam quality by chamber mirror M1-M2
SBy amplifying or the mode competition effect, (regeneration) amplification in flat-protruding unsteady cavity that chamber mirror M2, output cavity mirror 4 constitute is at last from output cavity mirror 4 output high light beam qualities, high power (energy) laser I
L
In above-mentioned several examples, if the reflectivity of minimizing chamber mirror M2 (R ≈ 50%, or lower), then chamber mirror M1, M2 can not form laser generation, and this moment chamber mirror M1, M2,4 coupling is each other strengthened, and their constitute coupling cavity laser.
Specifically selecting which kind of chamber type (stable cavity, metastable resonators, unsteady cavity) for use or wishing is the laser (injecting seed laser, seed-travelling-wave amplifier, seed-regenerative amplifier, coupling cavity laser etc.) of which kind of type, decides according to concrete application requirements.
The typical solid working-laser material is Nd:YAG, Nd:YLF, Nd:YVO
4, Yb:YAG, Nd:YAP, glass etc., from 1 to 15 millimeter of its diameter, long from 2 to 200 millimeters of rod.Running hours can also be together in series with many rods.Operation material can also be geometries such as lath, thin slice, dish, optical fiber.
Though the present invention is illustrated with the above embodiments and accompanying drawing; but the present invention is not limited to embodiment and accompanying drawing; after every those skilled in the art has seen specification of the present invention; thinkable any deformation program of the present invention all should be regarded as within protection scope of the present invention.
Claims (10)
1. excited coupling resonance-cavity laser is characterized in that:
Described laser by resonant cavity after mirror (1), element in the chamber (diaphragm, Q-switch etc.) (2), working-laser material (3), laser resonant cavity outgoing mirror (4), pumping system (5) is formed.Wherein, mirror behind the described resonant cavity (1) itself is the microlaser (perhaps can be used as the part of coupling cavity laser) of a high light beam quality, and pumping system (5) output pump light is I
P, by being excited coupling cavity output seed laser I
S, laser output laser is I
L
2. according to the excited coupling resonance-cavity laser of claim 1, it is characterized in that:
Mirror behind the described resonant cavity (1) is excited itself, and can be a whole cavity laser, also can be the disengagement chamber laser, and its output becomes chamber mirror (M2), the seed laser of output cavity mirror (4) institute formation main laser just;
Described operation material of being excited coupling cavity (1) employing can be the operation material identical with the main laser system, for example, and Nd:YAG, Nd:YLF, Nd:YVO
4, Yb:YAG, Nd:YAP, glass etc., the crystal that length is from 0.5 to 10 millimeter, it can also adopt in the operation material that mixes with main laser different, special impurity (for example, to mix the Cr of 1at.%
4+Deng);
The chamber mirror both ends of the surface of mirror behind the described resonant cavity (1) plate high-intensity deielectric-coating, be excited the chamber mirror (M1 of coupling cavity (1) with formation, M2), chamber mirror (M1) grows tall instead (R＞99.9%) to the work laser wave, and simultaneously to pump light wavelength high saturating (T＞85%), chamber mirror (M2) is to the partial reflection of work optical maser wavelength, its reflectivity R ≈ 5～99%, can (M1 M2) inserts the element that needs in the resonant cavity of Gou Chenging, and chamber mirror (M2) also can be an independent outgoing mirror at the chamber mirror; The seed laser that mirror behind the resonant cavity (1) is constituted is a diode pumping, also can be lamp pumping or alternate manner pumping, and described laser can be whole cavity configuration, also can be the cramped construction that separates.
3. according to the excited coupling resonance-cavity laser of claim 1, it is characterized in that:
The chamber mirror M1-M2 of mirror behind the described resonant cavity (1) constitutes Ping-Ping metastable resonators, by the seed laser I of the formed laser output of described Ping-Jie's Ping stable cavity high light beam quality
S, by amplifying or the mode competition effect, (regeneration) amplification in the Ping-Ping stable cavity that is made of chamber mirror M2, output cavity mirror (4) is at last from output cavity mirror 4 output high light beam qualities, high power (energy) laser I
L
4. according to the excited coupling resonance-cavity laser of claim 1, it is characterized in that:
The chamber mirror M1-M2 of mirror behind the described resonant cavity (1) constitutes Ping-Ping stable cavity, by the seed laser I of the formed laser output of described Ping-Ping stable cavity high light beam quality
S, by amplifying or the mode competition effect, (regeneration) amplification in the flat-recessed stable cavity that is made of chamber mirror M2, output cavity mirror (4) is at last from output cavity mirror (4) output high light beam quality, high power (energy) laser I
L
5. according to the excited coupling resonance-cavity laser of claim 1, it is characterized in that:
The chamber mirror M1-M2 of mirror behind the described resonant cavity (1) constitutes Ping-Ping stable cavity, by the seed laser I of the formed laser output of described Ping-Ping stable cavity high light beam quality
S, by amplifying or the mode competition effect, (regeneration) amplification in the flat-protruding stable cavity that is made of chamber mirror M2, output cavity mirror (4) is at last from output cavity mirror (4) output high light beam quality, high power (energy) laser I
L
6. according to the excited coupling resonance-cavity laser of claim 1, it is characterized in that:
The chamber mirror M1-M2 of mirror behind the described resonant cavity (1) constitutes flat-recessed stable cavity, by the seed laser I of the formed laser output of described putting down-recessed stable cavity high light beam quality
S, by amplifying or the mode competition effect, (regeneration) amplification in flat-protruding astable chamber that chamber mirror M2, output cavity mirror (4) constitute is at last from output cavity mirror 4 output high light beam qualities, high power (energy) laser I
L
7. according to the excited coupling resonance-cavity laser of claim 1, it is characterized in that:
The chamber mirror M1-M2 of mirror behind the described resonant cavity (1) constitutes flat-recessed stable cavity, by the seed laser I of the formed laser output of described putting down-recessed stable cavity high light beam quality
S, by amplifying or the mode competition effect, (regeneration) amplification in the confocal astable chamber of recessed-protruding void that chamber mirror M2, output cavity mirror (4) constitute is at last from output cavity mirror 4 output high light beam qualities, high power (energy) laser I
L
8. according to the excited coupling resonance-cavity laser of claim 1, it is characterized in that:
The chamber mirror M1-M2 of mirror behind the described resonant cavity (1) constitutes flat-protruding astable chamber, by the seed laser I of the formed laser output in described putting down-protruding astable chamber high light beam quality
s, by amplifying or the mode competition effect, (regeneration) amplification in Ping-Jie's Ping stable cavity that chamber mirror M2, output cavity mirror (4) constitute is at last from output cavity mirror 4 output high light beam qualities, high power (energy) laser I
L
9. according to the excited coupling resonance-cavity laser of claim 1, it is characterized in that:
The chamber mirror M1-M2 of mirror behind the described resonant cavity (1) constitutes flat-protruding unstable cavity laser, the seed laser I of its output high light beam quality
SBy amplifying or the mode competition effect, (regeneration) amplification in flat-recessed stable cavity that chamber mirror M2, output cavity mirror (4) constitute is at last from output cavity mirror (4) output high light beam quality, high power (energy) laser IL.
Chamber mirror (4) can also be a convex surface, constitutes flat-protruding unsteady cavity structure by chamber mirror M2, output cavity mirror (4).So, constitute the high light beam quality seed laser I that exports in flat-protruding unstable cavity laser by chamber mirror M1-M2
S, by amplifying or the mode competition effect, (regeneration) amplification in flat-protruding astable chamber that chamber mirror M2, output cavity mirror 4 constitute is at last from output cavity mirror 4 output high light beam qualities, high power (energy) laser I
L
10. according to the excited coupling resonance-cavity laser of claim 1, it is characterized in that:
The chamber mirror M1-M2 of mirror behind the described resonant cavity (1) constitutes recessed-protruding unstable cavity laser, the seed laser I of its output high light beam quality
SBy amplifying or the mode competition effect, (regeneration) amplification in flat-protruding unsteady cavity that chamber mirror M2, output cavity mirror 4 constitute is at last from output cavity mirror 4 output high light beam qualities, high power (energy) laser I
L
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| CN 01102490 CN1317856A (en) | 2001-02-09 | 2001-02-09 | Excited coupling resonance-cavity laser |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354901A (en) * | 2011-09-30 | 2012-02-15 | 武汉新特光电技术有限公司 | Semiconductor side pumped solid-state laser |
| CN101981769B (en) * | 2008-03-31 | 2012-08-22 | 伊雷克托科学工业股份有限公司 | Multi-pass optical power amplifier |
| CN105428980A (en) * | 2015-12-30 | 2016-03-23 | 北京国科世纪激光技术有限公司 | Design method of end-pumped resistance-trimming laser |
| CN105428979A (en) * | 2015-12-30 | 2016-03-23 | 北京国科世纪激光技术有限公司 | Design method of end-pumped wire-drawing die punching laser |
| CN106207738A (en) * | 2016-09-22 | 2016-12-07 | 广州安特激光技术有限公司 | Low-repetition-frequency passive Q-adjusted regenerative amplification lamp pump picosecond laser |
| CN108827431A (en) * | 2018-06-06 | 2018-11-16 | 南京邮电大学 | A kind of opto-mechanical chamber mass sensor based on OPCL coupling |
-
2001
- 2001-02-09 CN CN 01102490 patent/CN1317856A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101981769B (en) * | 2008-03-31 | 2012-08-22 | 伊雷克托科学工业股份有限公司 | Multi-pass optical power amplifier |
| CN102354901A (en) * | 2011-09-30 | 2012-02-15 | 武汉新特光电技术有限公司 | Semiconductor side pumped solid-state laser |
| CN102354901B (en) * | 2011-09-30 | 2014-07-23 | 武汉新特光电技术有限公司 | Semiconductor side pumped solid-state laser |
| CN105428980A (en) * | 2015-12-30 | 2016-03-23 | 北京国科世纪激光技术有限公司 | Design method of end-pumped resistance-trimming laser |
| CN105428979A (en) * | 2015-12-30 | 2016-03-23 | 北京国科世纪激光技术有限公司 | Design method of end-pumped wire-drawing die punching laser |
| CN106207738A (en) * | 2016-09-22 | 2016-12-07 | 广州安特激光技术有限公司 | Low-repetition-frequency passive Q-adjusted regenerative amplification lamp pump picosecond laser |
| CN108827431A (en) * | 2018-06-06 | 2018-11-16 | 南京邮电大学 | A kind of opto-mechanical chamber mass sensor based on OPCL coupling |
| CN108827431B (en) * | 2018-06-06 | 2020-08-14 | 南京邮电大学 | An optomechanical cavity mass sensor based on OPCL coupling |
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