CN1207825C - Optical parameter chirped pulse amplification laser system - Google Patents
Optical parameter chirped pulse amplification laser system Download PDFInfo
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- CN1207825C CN1207825C CN 03115411 CN03115411A CN1207825C CN 1207825 C CN1207825 C CN 1207825C CN 03115411 CN03115411 CN 03115411 CN 03115411 A CN03115411 A CN 03115411A CN 1207825 C CN1207825 C CN 1207825C
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- 230000003321 amplification Effects 0.000 title claims abstract description 35
- 238000003199 nucleic acid amplification method Methods 0.000 title claims abstract description 35
- 230000003287 optical effect Effects 0.000 title claims abstract description 16
- 239000013078 crystal Substances 0.000 claims abstract description 28
- 238000005086 pumping Methods 0.000 claims description 18
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical group [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 239000010437 gem Substances 0.000 claims description 3
- 229910001751 gemstone Inorganic materials 0.000 claims description 3
- 229910052719 titanium Inorganic materials 0.000 claims description 3
- 239000010936 titanium Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 description 6
- 230000001360 synchronised effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 4
- 229910052779 Neodymium Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 3
- 230000003595 spectral effect Effects 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000011514 reflex Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
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Abstract
The invention relates to an optical parameter chirped pulse amplification laser system, which consists of a femtosecond laser oscillator, a grating pair pulse stretcher, a grating pair pulse compressor, a beam splitter, a first-stage OPA amplifier, a back-stage OPA amplifier, a pump source system pre-amplifier, a first frequency doubling crystal, a dichroic beam splitter, a pump source system main amplification chain, a second frequency doubling crystal and a dichroic reflector.
Description
Technical field:
The present invention relates to laser, particularly a kind of optical parameter chirp impulse amplification laser system its objective is the ultra-intense ultra-short laser pulse that will produce high s/n ratio.
Background technology:
Over past ten years, chirped pulse amplifies (Chirped Pulse Amplification is abbreviated as CPA) technology and has been widely applied to and builds many terawatt (TW)s (promptly 10
12W is abbreviated as TW) the level laser system.But the shortcoming that the superpower ultrashort laser of CPA system still exists some to be difficult to overcome: the output pulse signal to noise ratio of laser system is low, and exists prepulsing to amplify; There is serious spectrum gain narrowing effect in amplification process; Thermal effect in the amplification medium makes the beam quality deterioration of laser system etc. in addition.
Development in recent years amplify (CPA) and optical parameter based on chirped pulse and amplify the brand-new principle that optical parameter chirped pulse that (OpticalParametric Amplification is abbreviated as OPA) combine amplifies (OPCPA).It is earlier femtosecond ultrashort laser pulse flashlight broadening to be become the nanosecond chirped pulse, is amplified by the OPA system of nanosecond intense laser pulse pumping, utilizes grating pair to compress at output at last, obtains the superpower ultrashort laser output of femtosecond.Utilize nonlinear crystals such as LBO or BBO, KDP, DKDP to have more superiority than CPA laser aid with conventional laser amplification medium (as neodymium glass) as the OPCPA laser aid of optical parameter amplifying stage, as: high output signal-to-noise ratio; Very low prepulsing level; Can eliminate the spectrum gain narrowing effect, can provide much wideer that gain bandwidth (about 200 nanoscales) ultrashort to support (less than 10 femtosecond) femto-second laser pulse amplifies than the neodymium glass system; The B integration of system can be done very for a short time, so laser system can obtain high output beam quality or the like.At present, Britain has reported the Rutherford experiment chamber experimental result (Applied Optics, 2000,39 (15): 2422-2427) of the peak power of usefulness OPCPA scheme acquisition near the 1TW/300 femtosecond.This breadboard OPCPA laser system as shown in Figure 1, among the figure:
01-femtosecond laser oscillator, 02-pulse stretcher, 03-OPA laser amplifier, 04-laser pumping source, 05-pulse shortener.
The operation principle of this laser system is: the femtosecond mode locking pulse that femtosecond laser oscillator 01 produces, process pulse stretcher 02 broadening is to nanosecond order, be injected in the OPA laser amplifier 03, as the light pulse of OPA amplifying signal, the laser pulse of discrete laser pumping source 04 generation then is injected in 03 as the pump light that OPA amplifies simultaneously, after 03 amplification of OPA laser amplifier, signal pulse carries out pulse compression by pulse shortener 05 again, obtains the output of 1TW/300 femtosecond laser at last.This laser system is in the OPA amplification process, pumping source and signal source are respectively two independently laser systems, the time synchronized of flashlight and pump light solves by the electronics technology, and time synchronized (TimingSynchronization) between signal pulse and the pump light pulse and time jitter (Timing Jitter) best result are about 100 psecs.Because in the OPCPA amplification process, flashlight only can obtain gain and amplify in this time window of pump light pulse duration, and in the efficient OPCPA amplification system, the pulse duration of flashlight and pump light all is about 1 nanosecond, therefore time synchronization error between flashlight and the pump light and time jitter not only can cause the fluctuating of flashlight gain, and can cause the distortion of spectral shape.Theoretical Calculation and experimental study show, when time jitter is 100 psecs, can cause that the obvious gain of amplifying signal rises and falls and spectrum distortion.In addition, the every work of the pump light of this laser system once needs nearly 20 minutes, making that flashlight can only adopt with aiming at of pump light in the OPA amplification system adds frequency multiplication Nd:YAG light source, cause in the OPA amplifier flashlight and pump light aim at and adjusting that the time is synchronous very complexity and accuracy and reliability reduce.
Summary of the invention:
The present invention is directed to the present above-mentioned OPCPA system key technical problem that flashlight exists in the OPA amplifier aspect exact time synchronization, time jitter and the light path of pump light are accurately aimed at, propose a kind of optical parameter chirped pulse and amplify (OPCPA) laser system, it is synchronous that its flashlight and pump light can reach precise time; Simultaneously pump light is with repetition rate (1-10Hz) operation, thereby makes the first order of OPA amplification system operate at the 1-10Hz state, directly can carry out aiming at and adjusted in concert of flashlight and pump light in the OPA amplifiers at different levels, with raising accuracy and reliability.
Technical solution of the present invention is as follows:
A kind of optical parameter chirp impulse amplification laser system, comprise femtosecond laser oscillator, grating pair pulse stretcher, grating pair pulse shortener, it is characterized in that also having: beam splitter, first order OPA amplifier, back level OPA amplifier, pumping source system pre-amplifier, first frequency-doubling crystal, beam-splitter, the master of pumping source system amplifier chain, second frequency-doubling crystal and reflector, the relative position relation of above-mentioned each component is as follows:
The femtosecond mode locking pulse that this femtosecond laser oscillator produces is listed as through beam splitter and is divided into two-beam, wherein a branch of light is injected into the grating pair pulse stretcher, broadening becomes nanosecond order, be re-introduced into the first order OPA amplifier of amplification system, as the OPA flashlight, after amplifying, be re-introduced into back level OPA amplifier as amplifying signal light; The pre-amplifier amplification back that another Shu Guang that tells from beam splitter is injected into the pumping source system is by the output of first frequency-doubling crystal acquisition frequency doubled light, and beam-splitter is injected into first order OPA amplifier with this part frequency doubled light, as the OPA pump light; The remaining fundamental frequency light pulse that sees through from beam-splitter is re-introduced into the main amplifier chain of pumping source system, amplify the back and obtain frequency doubled light output by second frequency-doubling crystal, level OPA amplifier after reflector is injected into, make the pump light that this OPA amplifies, the flashlight after the level OPA amplifier amplification of back is incorporated into the grating pair pulse shortener again and exports many terawatt (TW)s of femtosecond magnitude laser pulse after compression.
Described femtosecond laser oscillator is a titanium jewel femtosecond laser oscillator, or Yb:YAG femtosecond laser oscillator.
Described OPA amplifier is made by LBO or BBO, KDP, DKDP crystal.
Described first frequency-doubling crystal and second frequency-doubling crystal are DKDP or LBO or KDP crystal.
Described beam-splitter is the dichroism beam-splitter, and described reflector is a dichroic reflectors.
Technique effect of the present invention is:
In OPCPA amplification laser system of the present invention, therefore flashlight and pump light can realize that precise time is synchronous all from same laser oscillator.
Pump light is with repetition rate (1-10Hz) operation, thereby makes the first order of OPA amplification system operate at the 1-10Hz state, directly can carry out aiming at and adjusted in concert of flashlight and pump light in the OPA amplifiers at different levels; Need not to add alignment light source, and aligning and adjusted in concert is simpler and more direct, convenient and accurately.
Description of drawings:
Fig. 1 is existing OPCPA amplification laser system block diagram.
Fig. 2 is an OPCPA amplification laser system specific embodiment block diagram of the present invention.
Among Fig. 2:
1-femtosecond laser oscillator 2-beam splitter
3-grating pair pulse stretcher 4-first order OPA amplifier
The pre-amplifier of level OPA amplifier 6-pumping source system behind the 5-
The 7-first frequency-doubling crystal 8-dichroism beam-splitter
The 9-pumping source master of system amplifier chain 10-second frequency-doubling crystal
11-dichroic reflectors 12-grating pair pulse shortener
Embodiment:
See also Fig. 2 earlier, Fig. 2 is an optical parameter chirp impulse amplification laser system specific embodiment block diagram of the present invention, as seen from the figure, optical parameter chirp impulse amplification laser system of the present invention is made of femtosecond laser oscillator 1, beam splitter 2, grating pair pulse stretcher 3, first order OPA amplifier 4, back level OPA amplifier 5, the pre-amplifier 6 of pumping source system, frequency-doubling crystal 7, dichroism beam-splitter 8, the main amplifier chain 9 of pumping source system, frequency-doubling crystal 10, dichroic reflectors 11, grating pair pulse shortener 12, and the course of work of this OPCPA laser system is as follows:
1064 nanometer mode locking pulses of about 100 femtoseconds of titanium jewel femtosecond laser oscillator 1 generation, one row are listed as through beam splitter 2 and are divided into two-beam, wherein a branch of light is injected into grating pair pulse stretcher 3, broadening is to 300 nanosecond orders, deliver to first order OPA amplifier (lbo crystal) 4 again, as the seed signal light of OPA amplifier system.Another Shu Guang that tells from beam splitter 2 is injected into the pre-amplifier 6 with the pumping source system of 1Hz repetition rate operation.In pre-amplifier 6, after pulse shaping, light spectrum reshaping and amplification, obtain about 800 nanosecond pulsewidth, spectral width less than 1064 nanometer laser pulses of 1 nanometer, obtain frequency doubled lights output by first frequency-doubling crystal (DKDP) 7.By dichroism beam-splitter 8 this part frequency doubled light is reflexed to the first order OPA amplifier 4 of OPCPA laser system, as the pump light of OPA.And be re-introduced into the neodymium glass master amplifier chain 9 of OPA pumping source system from the residue 1064 nanometer fundamental frequency light pulses that beam-splitter 8 sees through, amplify the back and obtain frequency doubled light output by second frequency-doubling crystal (KDP) 10, level OPA amplifier (two lbo crystals) 5 after dichroic reflectors 11 reflexes to is as the pump light of this OPA amplifying stage.Be introduced in grating pair pulse shortener 12 by the flashlight after level OPA amplifier 5 amplifications of back.When the energy of pump light is 10J, behind compressor reducer, obtain peak power and be higher than 10TW, pulse duration is the laser pulse of 120 femtoseconds.
OPCPA laser system embodiment of the present invention, show after tested: the flashlight of amplification process and the time synchronized between the pump light and time jitter are less than 10 psecs, in addition, the prime OPA of OPCPA laser system has adopted the pump mode of 1Hz, OPA amplifying stages at different levels can directly be aimed at, need not to add alignment light source, aim at and adjusted in concert is simple and direct, convenient, accurate.
Claims (5)
1, a kind of optical parameter chirp impulse amplification laser system, comprise femtosecond laser oscillator (1), grating pair pulse stretcher (3), grating pair pulse shortener (12), it is characterized in that also having: beam splitter (2), first order OPA amplifier (4), back level OPA amplifier (5), pumping source system pre-amplifier (6), first frequency-doubling crystal (7), beam-splitter (8), the master of pumping source system amplifier chain (9), second frequency-doubling crystal (10) and reflector (11), the relative position relation of above-mentioned each component is as follows:
The femtosecond mode locking pulse that this femtosecond laser oscillator (1) produces is listed as through beam splitter (2) and is divided into two-beam, wherein a branch of light is injected into grating pair pulse stretcher (3), broadening becomes nanosecond order, be re-introduced into first order OPA amplifier (4), as the OPA flashlight, after amplifying, be re-introduced into back level OPA amplifier (5) as amplifying signal light, another Shu Guang that tells from beam splitter (2) is injected into the pre-amplifier (6) of pumping source system, amplify the back and obtain frequency doubled light output by first frequency-doubling crystal (7), beam-splitter (8) is injected into first order OPA amplifier (4) with this part frequency doubled light, as the OPA pump light; The remaining fundamental frequency light pulse that sees through from beam-splitter (8) is re-introduced into the main amplifier chain (9) of pumping source system, amplify the back and obtain frequency doubled light output by second frequency-doubling crystal (10), level OPA amplifier (5) after reflector (11) is injected into, make the pump light that this OPA amplifies, the flashlight after back level OPA amplifier (5) amplification is incorporated into grating pair pulse shortener (12) again and exports many terawatt (TW)s of femtosecond magnitude laser pulse after compression.
2, optical parameter chirp impulse amplification laser system according to claim 1 is characterized in that described femtosecond laser oscillator is a titanium jewel femtosecond laser oscillator, or Yb:YAG femtosecond laser oscillator.
3, optical parameter chirp impulse amplification laser system according to claim 1 is characterized in that described OPA amplifier made by LBO or BBO or KDP or DKDP crystal.
4, optical parameter chirp impulse amplification laser system according to claim 1 is characterized in that described first frequency-doubling crystal (7) and second frequency-doubling crystal are DKDP crystal or KDP crystal.
5, optical parameter chirp impulse amplification laser system according to claim 1 is characterized in that described beam-splitter (8) is the dichroism beam-splitter, and described reflector (11) is a dichroic reflectors.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 03115411 CN1207825C (en) | 2003-02-14 | 2003-02-14 | Optical parameter chirped pulse amplification laser system |
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| CN 03115411 CN1207825C (en) | 2003-02-14 | 2003-02-14 | Optical parameter chirped pulse amplification laser system |
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| CN1207825C true CN1207825C (en) | 2005-06-22 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100504566C (en) * | 2006-04-21 | 2009-06-24 | 中国科学院物理研究所 | Chirp impulse compression method and device |
| CN101191970B (en) * | 2006-11-20 | 2010-06-23 | 中国科学院西安光学精密机械研究所 | Ultrafast optical parametric image amplification method and equipment thereof |
| CN100452569C (en) * | 2007-05-29 | 2009-01-14 | 中国科学院上海光学精密机械研究所 | Optical parameter chirped pulse amplification laser system |
| CN102162966B (en) * | 2011-04-06 | 2012-09-26 | 中国航空工业集团公司北京长城计量测试技术研究所 | Spectrum spreading device for femtosecond laser frequency comb |
| FR2984535B1 (en) * | 2011-12-14 | 2014-01-17 | Commissariat Energie Atomique | METHOD AND APPARATUS FOR OPTICAL PARAMETRIC AMPLIFICATION OF FREQUENCY DERIVED PULSES USING TWO PUMP SIGNALS AND ENABLING THE ENLARGEMENT OF THE GAIN SPECTRAL BAND |
| CN108565670B (en) * | 2018-04-08 | 2020-10-09 | 上海理工大学 | Method for realizing spectrum high-resolution coherent anti-Stokes Raman scattering light source |
| CN111082292A (en) * | 2019-12-09 | 2020-04-28 | 中国科学院上海光学精密机械研究所 | Quasi-continuous or continuous chirp pulse amplified fiber laser system |
| CN111064069B (en) * | 2019-12-29 | 2024-05-28 | 北京工业大学 | All-fiber femtosecond chirped pulse amplification system |
| CN111948871B (en) * | 2020-08-18 | 2022-01-28 | 中国工程物理研究院激光聚变研究中心 | Multi-pass amplification system shared by pump light and signal light |
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