CN101820130A - Method for adjusting non-collinear once chirped pulse optical parameter amplifying system - Google Patents
Method for adjusting non-collinear once chirped pulse optical parameter amplifying system Download PDFInfo
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- CN101820130A CN101820130A CN 201010137464 CN201010137464A CN101820130A CN 101820130 A CN101820130 A CN 101820130A CN 201010137464 CN201010137464 CN 201010137464 CN 201010137464 A CN201010137464 A CN 201010137464A CN 101820130 A CN101820130 A CN 101820130A
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Abstract
The invention discloses a method for adjusting a non-collinear once chirped pulse optical parameter amplifying system. The adjusting method comprises the following steps of: dividing a main laser into two beams and being incident to a crystal with a certain angle to generate self-frequency doubling light and sum frequency light, , and determining the angle of the non-linear crystal and the transmission direction of pump light in the non-collinear once chirped pulse optical parameter amplifying system through observing the strength of the sum frequency light and measuring the light spectrum of the sum frequency light by using a simple and rapid way. The method for adjusting the non-collinear once chirped pulse optical parameter amplifying system is not only suitable for adjusting the chirped pulse optical parameter amplifying system, but also suitable for adjusting a short pulse optical parameter amplifying system.
Description
Technical field
The invention belongs to high energy short-pulse laser field, be specifically related to a kind of method of adjustment of non-collinear once chirped pulse optical parameter amplifying system.
Background technology
Chirped pulse optical parameter amplifying technique has the advantage that gain is high, gain line is roomy, signal to noise ratio is high, is the key technology of development high energy PW impulse laser unit and EW impulse laser unit.Because the macro-energy pump light of using in the macro-energy chirped pulse optical parameter amplifying system mostly is single, and adopt non-colinear phase matched mode usually, existing method of adjustment is generally earlier fixedly pumping angle of light degree, scan non-linearity crystal angle or first fixedly nonlinear crystal angle scan the pump light incident angle again and obtain best nonlinear crystal angle and corresponding with it best pump light incident angle again.Such scanning process need expend a large amount of time; Along with the variation of environmental condition, as variation of temperature, the matching status of nonlinear crystal changes thereupon, just need repeat above-mentioned scanning process, expends a large amount of time and manpower and materials simultaneously.Therefore the method for adjustment that needs a kind of optical parameter amplification system of non-collinear once fast.
Summary of the invention
The method of adjustment that the purpose of this invention is to provide a kind of non-collinear once chirped pulse optical parameter amplifying system.Adopt the present invention can realize the rapid adjustment of non-collinear once optical parameter amplification system.
Method of adjustment of the present invention mainly comprises following content:
A, main laser beam splitting
Main laser then by aperture, is divided into two bundle beam splitting laser at first by dichroic mirror;
B, optical path arrangement
A branch of beam splitting laser in the two bundle beam splitting laser intersects at nonlinear crystal inside through splitting the plate back that rotates to an angle with another bundle beam splitting laser, and observation screen is placed the nonlinear crystal rear;
C, nonlinear crystal are regulated
Two bundle beam splitting laser will produce two bundles from frequency doubled light and a branch of and frequency light in nonlinear crystal; At first estimate on the observation screen and the frequency light intensity, coarse adjustment nonlinear crystal angle makes and light intensity is the strongest frequently; Use the spectrum of spectrometer measurement and frequency light then, accurate adjustment nonlinear crystal angle makes the centre wavelength that equals pump light with the centre wavelength of frequency light;
D, determine the transmission direction of pump light
The first benchmark aperture plate and the second benchmark aperture plate are placed light path, make with frequency light and pass the first benchmark aperture plate earlier, pass the second benchmark aperture plate again; Remove aperture and split plate; The angle of accommodation reflex mirror and dichroic mirror makes pump light pass the first benchmark aperture plate and the second benchmark aperture plate in succession.
The angle δ that splits that splits plate is determined by formula (1):
δ≈2αn
c/（n
s-1） （1）
Wherein α is the angle of main laser and pump light, n
s, n
cBe respectively the refractive index of main laser in splitting plate and nonlinear crystal.
The present invention has only used main laser in a-c step adjustment process, only need the pump light of little energy in the d step, and whole adjustment process is not all used single high energy pump light, therefore only needs a few minutes can finish the adjustment of system.
The present invention mainly by the main laser beam splitting is produced on nonlinear crystal from frequency doubled light and and light frequently, utilize and the accurately angle of definite nonlinear crystal and the incident angle of pump light of light intensity and spectrum frequently.
In optical parameter amplification system, the centre frequency and the wave vector of the ideler frequency light that main laser, pump light and they produce in nonlinear crystal satisfy relational expression (2)
When the centre frequency of pump light was the twice of main laser centre frequency, the centre frequency of ideler frequency light just in time equaled the centre frequency of main laser, and the inverse process that this moment, optical parameter was amplified is equivalent to the frequency multiplication process of main laser.
The present invention with the main laser beam splitting again and frequently, the direction of a branch of main laser of that of deflection is equivalent to the transmission direction of ideler frequency light, two bundle beam splitting light be equivalent to the transmission direction of pump light with the frequency light direction.Therefore, accurately determine above-mentioned and frequently in the process angle of nonlinear crystal and and the transmission direction of light frequently, just equaled accurately to determine the angle of nonlinear crystal in the parameter amplification process and the transmission direction of pump light.
Adopt method of the present invention to adjust non-linear once chirped pulse optical parameter amplifying system, adjustment process is simple, quick and cost is low.The present invention is applicable to that the centre frequency of pump light is the situation of main laser centre frequency twice.The present invention is not only applicable to chirped pulse optical parameter amplifying system, is applicable to the short pulse optical parameter amplification system simultaneously yet.
Description of drawings
Fig. 1 is the light channel structure schematic diagram of the method for adjustment of non-collinear once chirped pulse optical parameter amplifying system of the present invention.
Fig. 2 for the main laser beam splitting light that adopts the present invention and on observation screen, obtain from frequency doubled light and and the effect photo of light frequently
Among the figure, 1. main laser 2. dichroic mirrors 3. apertures 4. are split plate 5. nonlinear crystals 6. first benchmark aperture plates 7. second benchmark aperture plates 8. observation screens 9. spectrometers 10. pump lights 11. speculums.
Embodiment
The present invention is further illustrated below in conjunction with accompanying drawing.
Fig. 1 is the light channel structure schematic diagram of the method for adjustment of non-collinear once chirped pulse optical parameter amplifying system of the present invention, as can be seen from Figure 1, the centre wavelength of main laser 1 is 1053nm, the centre wavelength of pump light 10 is 526.5nm, nonlinear crystal 5 is three lithium borates (LBO) crystal, main laser 1 is 1.75 degree with the angle of pump light 10, and phase matching angle is 15.3 degree.
Main laser 1 is divided into two bundle beam splitting laser by aperture 3 then at first by dichroic mirror 2, and wherein a branch of beam splitting laser turns over certain angle and restraints beam splitting laser with another and intersect at nonlinear crystal 5 inside through splitting plate 4.
Fig. 2 for the main laser beam splitting light that adopts the present invention and on observation screen, obtain from frequency doubled light and and the effect photo of light frequently.As can be seen from Figure 2, the beam splitting laser of main laser 1 will produce two bundles from frequency doubled light and a branch of and frequency light in nonlinear crystal 5, on observation screen 8, can be visually observed three hot spots, the hot spot on both sides be two bundle beam splitting laser from frequency doubled light, middle hot spot be and frequency light.The angle of coarse adjustment nonlinear crystal 5 makes and frequency light intensity maximum, and the brightness of two side spots is as far as possible little; Use the spectrum of spectrometer 9 measurements and frequency light then, the angle of accurate adjustment nonlinear crystal 5 makes the centre wavelength that equals pump light 10 with the centre wavelength of frequency light.
The first benchmark aperture plate 6 and the second benchmark aperture plate 7 are placed light path, make with frequency light and pass the first benchmark aperture plate 6 earlier, pass the second benchmark aperture plate 7 again; Remove aperture 3 and split plate 4; The angle of accommodation reflex mirror 11 and dichroic mirror 2 makes pump light 10 pass the first benchmark aperture plate 6 and the second benchmark aperture plate 7 in succession, and adjustment process is finished.
Method of the present invention also is applicable to the adjustment of short pulse optical parameter amplification system.
In sum, the invention provides a kind of non-collinear once chirped pulse optical parameter amplifying system method of adjustment, can realize accurately adjusting fast of system.
Claims (2)
1. the method for adjustment of a non-collinear once chirped pulse optical parameter amplifying system is characterized in that comprising following content:
A, main laser beam splitting
Main laser (1) then by aperture (3), is divided into two bundle beam splitting laser at first by dichroic mirror (2);
B, optical path arrangement
A branch of beam splitting laser in the two bundle beam splitting laser intersects at nonlinear crystal (5) inside through splitting plate (4) back that rotates to an angle with another bundle beam splitting laser, and observation screen (8) is placed nonlinear crystal (5) rear;
C, nonlinear crystal are regulated
Two bundle beam splitting laser will produce two bundles from frequency doubled light and a branch of and frequency light in nonlinear crystal (5); At first estimate on the observation screen and the frequency light intensity, coarse adjustment nonlinear crystal (5) angle makes and light intensity is the strongest frequently; Use the spectrum of spectrometer (9) measurement and frequency light then, accurate adjustment nonlinear crystal (5) angle makes the centre wavelength that equals pump light (10) with the centre wavelength of frequency light;
D, determine the transmission direction of pump light
The first benchmark aperture plate (6) and the second benchmark aperture plate (7) are placed light path, make with frequency light and pass the first benchmark aperture plate (6) earlier, pass the second benchmark aperture plate (7) again; Remove aperture (3) and split plate (4); The angle of accommodation reflex mirror (11) and dichroic mirror (2) makes pump light pass the first benchmark aperture plate (6) and the second benchmark aperture plate (7) in succession.
2. method of adjustment according to claim 1 is characterized in that the described angle δ that splits that splits plate (4) is determined by formula (1):
δ≈2αn
c/（n
s-1） （1）
Wherein α is the angle of main laser and pump light, n
s, n
cBe respectively the refractive index of main laser in splitting plate and nonlinear crystal.
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| CN 201010137464 CN101820130A (en) | 2010-04-01 | 2010-04-01 | Method for adjusting non-collinear once chirped pulse optical parameter amplifying system |
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| CN 201010137464 CN101820130A (en) | 2010-04-01 | 2010-04-01 | Method for adjusting non-collinear once chirped pulse optical parameter amplifying system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108155554A (en) * | 2018-01-31 | 2018-06-12 | 深圳大学 | A kind of photoparametric laser amplifier preparation method and photoparametric laser amplifier |
| CN108649419A (en) * | 2018-03-02 | 2018-10-12 | 上海交通大学 | Superelevation mean power optical parameter chirped pulse amplification device |
| CN113189824A (en) * | 2021-04-21 | 2021-07-30 | 中国科学院上海光学精密机械研究所 | Broadband optical parametric amplification device based on double nonlinear optical processes |
| CN114413794A (en) * | 2022-01-29 | 2022-04-29 | 中国工程物理研究院激光聚变研究中心 | System and method for measuring optimal phase matching angle of large-diameter KDP crystal |
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| CN1315671A (en) * | 2000-03-28 | 2001-10-03 | 中国科学院物理研究所 | Ultrashort pulse chirp optical parametric laser amplifier |
| CN1315765A (en) * | 2000-03-28 | 2001-10-03 | 中国科学院物理研究所 | Ultrashort pulse chirped optical parameter laser |
| CN101154789A (en) * | 2006-09-30 | 2008-04-02 | 中国科学院西安光学精密机械研究所 | Optical Parametric Amplification System Based on All-Fiber Laser |
| CN101211088A (en) * | 2006-12-28 | 2008-07-02 | 中国科学院西安光学精密机械研究所 | Single crystal tunable broadband non-collinear femtosecond optical parametric amplification method and device |
-
2010
- 2010-04-01 CN CN 201010137464 patent/CN101820130A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1315671A (en) * | 2000-03-28 | 2001-10-03 | 中国科学院物理研究所 | Ultrashort pulse chirp optical parametric laser amplifier |
| CN1315765A (en) * | 2000-03-28 | 2001-10-03 | 中国科学院物理研究所 | Ultrashort pulse chirped optical parameter laser |
| CN101154789A (en) * | 2006-09-30 | 2008-04-02 | 中国科学院西安光学精密机械研究所 | Optical Parametric Amplification System Based on All-Fiber Laser |
| CN101211088A (en) * | 2006-12-28 | 2008-07-02 | 中国科学院西安光学精密机械研究所 | Single crystal tunable broadband non-collinear femtosecond optical parametric amplification method and device |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108155554A (en) * | 2018-01-31 | 2018-06-12 | 深圳大学 | A kind of photoparametric laser amplifier preparation method and photoparametric laser amplifier |
| CN108155554B (en) * | 2018-01-31 | 2019-08-16 | 深圳大学 | A kind of photoparametric laser amplifier preparation method and photoparametric laser amplifier |
| CN108649419A (en) * | 2018-03-02 | 2018-10-12 | 上海交通大学 | Superelevation mean power optical parameter chirped pulse amplification device |
| CN113189824A (en) * | 2021-04-21 | 2021-07-30 | 中国科学院上海光学精密机械研究所 | Broadband optical parametric amplification device based on double nonlinear optical processes |
| CN114413794A (en) * | 2022-01-29 | 2022-04-29 | 中国工程物理研究院激光聚变研究中心 | System and method for measuring optimal phase matching angle of large-diameter KDP crystal |
| CN114413794B (en) * | 2022-01-29 | 2023-09-22 | 中国工程物理研究院激光聚变研究中心 | System and method for measuring optimal phase matching angle of large-caliber KDP crystal |
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Application publication date: 20100901 |