CN102662289A - Optical parameter chirped pulse amplifying device - Google Patents
Optical parameter chirped pulse amplifying device Download PDFInfo
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- CN102662289A CN102662289A CN201210138150XA CN201210138150A CN102662289A CN 102662289 A CN102662289 A CN 102662289A CN 201210138150X A CN201210138150X A CN 201210138150XA CN 201210138150 A CN201210138150 A CN 201210138150A CN 102662289 A CN102662289 A CN 102662289A
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- chirped pulse
- optical parameter
- opcpa
- regenerative amplifier
- parameter chirped
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
An optical parameter chirped pulse amplifying device comprises a chirped pulse mode-locked laser, an optical splitter, a low-temperature ytterbium-doped yttrium aluminium garnet (Yb: YAG) regenerative amplifier, a frequency doubling crystal, a stretcher, a nonlinear crystal and a compressor. The isogenous optical parameter chirped pulse amplifying (OPCPA) device is realized by means of excellent thermal management performance of Yb: YAG crystals and the gain narrowing effect of the regenerative amplifier. The device provided by the invention is simple and compact and high in signal-to-noise ratio; the repetition frequency of the device can be increased to several thousand hertz kHz; and the device can be applicable for picosecond (ps) level of cascading OPCPA.
Description
Technical field
The present invention is that a kind of optical parameter chirped pulse amplifies (being designated hereinafter simply as OPCPA) device, mainly is applicable to the signal to noise ratio (S/N ratio) and the repetition frequency that improve OPCPA, and its advantage is simple and compact for structure, and signal to noise ratio (S/N ratio) is high, and repetition frequency is high to number kHz.
Background technology
High s/n ratio high repetition frequency ultrashort laser pulse has a wide range of applications in fields such as Laser Processing, laser medicine, laser physics and chemistry.But you clap in watt ultrashort laser pulse target practice experiment in kilojoule; Parametric fluorescence in the optical parameter amplification process can cause the OPCPA signal to noise ratio (S/N ratio) to descend; Prepulsing or main pulse base can change before laser pulse arrives or destroy the target material, cause the failure of an experiment of practicing shooting.Present main amplification gain medium neodymium-doped yttrium-aluminum garnet (Nd:YAG) in advance with neodymium glass (Nd:glass) because influence of thermal effect and can not limit the OPCPA broad application at steady operation under the repetition frequency necessarily.
The main method of the raising signal to noise ratio (S/N ratio) that has proposed at present has saturable absorber, the rotation of non linear elliptic polarization, the generation of cross polarization ripple, non-linear Sagnac (Sagnac) interference, plasma somascope, body Bragg grating (VBG) spectral filter etc.These methods all need extras, and complex structure, filter also can extra introducing high-order nonlinear effects, and its signal to noise ratio (S/N ratio) reduces.
Summary of the invention
The objective of the invention is to overcome the deficiency of above-mentioned prior art, a kind of optical parameter chirped pulse multiplying arrangement is provided, this device should have simple and compact for structure, and signal to noise ratio (S/N ratio) is high, the high advantage to number kHz of repetition frequency.
Technical solution of the present invention is following:
A kind of optical parameter chirped pulse multiplying arrangement; Characteristics are: be divided into two bundles from the chirped pulse sequence of chirped pulse mode-locked laser output through behind the beam splitter; Wherein a branch of successively through shining on the nonlinear crystal behind low temperature Yb:YAG regenerative amplifier, the frequency-doubling crystal, another Shu Yici exports after through stretcher, described nonlinear crystal and compressor reducer.
Said regenerative amplifier can amplify the energy that injects light pulse, and pumping source is semiconductor laser (LD), amplifying power 10
7, Pockers cell and LD are by the seed source synchronous triggering.
Principle of work of the present invention:
In the optical parameter chirped pulse multiplying arrangement because pump light time window effect; Parametric fluorescence is limited in the gain window usually; Therefore the signal to noise ratio (S/N ratio) that causes of prepulsing descends and in OPCPA, can obtain reduction through the time window enhancement effect, requires the pump light pulsewidth less than 10ps.
The gain line style of regenerative amplifier operation material is a Gaussian function, and small signal gain coefficient is maximum at the peak value place, and offset peak place small signal gain coefficient is less.After chirped pulse comes and goes repeatedly in the regenerative amplification chamber; The more and more narrow that departs from the spectrum of launching main peak owing to can not get amplifying on time and spectrum; Light pulse can be compressed to picosecond magnitude, and the pumping time window is limited to picosecond magnitude, improves the signal to noise ratio (S/N ratio) of OPCPA.
Reduce with temperature, the Yb:YAG crystal shows the Stimulated Light-emission cross section and becomes characteristic big, that emission spectrum narrows down, thermal conductivity increases.The Yb:YAG crystal microchip is placed in the vacuum chamber by liquid nitrogen refrigerating, can realizes the regenerative amplifier of number kHz.
The invention has the advantages that:
1, compact conformation, the pump light of OPA does not have stretcher, can not introduce the high-order phase noise.It directly utilizes the gain narrowing effect of regenerative amplifier that the pump light pulsewidth that the OPCPA parameter amplifies is limited in picosecond magnitude, can effectively suppress parametric fluorescence, improves signal to noise ratio (S/N ratio);
2, utilize the good thermal behavior of Yb:YAG crystal, can realize the OPCPA output of number kHz;
3, homology OPCPA has eliminated the requirement of psec OPCPA to synchronization accuracy.
Description of drawings
Fig. 1 is the structural representation of OPCPA device of the present invention.
Among the figure:
1-chirped pulse mode-locked laser; The 2-beam splitter; 3-low temperature Yb:YAG regenerative amplifier; The 4-frequency-doubling crystal; The 5-stretcher; The 6-nonlinear crystal; The 7-compressor reducer;
Embodiment
Below in conjunction with embodiment and accompanying drawing the present invention is further specified, but should not limit protection scope of the present invention with this.
See also Fig. 1 earlier, Fig. 1 is the structural representation of OPCPA device of the present invention.Visible by figure; Optical parameter chirped pulse multiplying arrangement of the present invention; Constitute: be divided into two bundles through behind the beam splitter from the chirped pulse sequence of chirped pulse mode-locked laser output; Wherein a branch of successively through shining on the nonlinear crystal behind regenerative amplifier, the frequency-doubling crystal, another Shu Yici exports after through stretcher, described nonlinear crystal and compressor reducer.
Said beam splitter is divided into input optical signal the two-beam signal of different light intensity degree.
Said regenerative amplifier can amplify the energy that injects light pulse, and pumping source is LD, amplifying power 10
7, Pockers cell and LD are by the seed source synchronous triggering.
Use high s/n ratio high repetition frequency OPCPA device shown in Figure 1; The optical fiber mode-locked laser adopts the nonlinear polarization rotation technique to combine chirped pulse spectral filtering method to realize output center wavelength 1030nm, spectrum width 8.9nm; Repetition frequency 15.2MHz; Regenerative amplifier is the low temperature Yb:YAG regenerative amplifier of liquid nitrogen refrigerating, and OPCPA repetition frequency 10Hz improves 10 times than traditional neodymium glass OPCPA.
Claims (1)
1. optical parameter chirped pulse multiplying arrangement; Be characterised in that it constitutes: behind the chirped pulse sequence process beam splitter (2) of chirped pulse mode-locked laser (1) output, be divided into two bundles; Wherein a branch of process low temperature Yb:YAG regenerative amplifier (3) carries out energy and amplifies; Pass through afterwards that the pump light as optical parameter chirped pulse multiplying arrangement shines on the nonlinear crystal (6) after frequency-doubling crystal (4) frequency multiplication, the flashlight of another Shu Zuowei optical parameter chirped pulse multiplying arrangement is exported through stretcher (5), described nonlinear crystal (6) and compressor reducer (7) back successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210138150XA CN102662289A (en) | 2012-05-04 | 2012-05-04 | Optical parameter chirped pulse amplifying device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210138150XA CN102662289A (en) | 2012-05-04 | 2012-05-04 | Optical parameter chirped pulse amplifying device |
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| CN102662289A true CN102662289A (en) | 2012-09-12 |
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| CN201210138150XA Pending CN102662289A (en) | 2012-05-04 | 2012-05-04 | Optical parameter chirped pulse amplifying device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110187588A (en) * | 2019-04-29 | 2019-08-30 | 华中科技大学 | A kind of broadband optical parameter amplification method and device based on cascaded transistor |
| CN112903123A (en) * | 2021-02-01 | 2021-06-04 | 中国科学院上海光学精密机械研究所 | Method and device for measuring single signal-to-noise ratio boost degree of plasma mirror based on synchronous chirp probe pulse |
-
2012
- 2012-05-04 CN CN201210138150XA patent/CN102662289A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110187588A (en) * | 2019-04-29 | 2019-08-30 | 华中科技大学 | A kind of broadband optical parameter amplification method and device based on cascaded transistor |
| CN110187588B (en) * | 2019-04-29 | 2020-11-17 | 华中科技大学 | Broadband optical parametric amplification method and device based on cascade crystal |
| CN112903123A (en) * | 2021-02-01 | 2021-06-04 | 中国科学院上海光学精密机械研究所 | Method and device for measuring single signal-to-noise ratio boost degree of plasma mirror based on synchronous chirp probe pulse |
| CN112903123B (en) * | 2021-02-01 | 2022-08-09 | 中国科学院上海光学精密机械研究所 | Method and device for measuring single signal-to-noise ratio boost degree of plasma mirror based on synchronous chirp probe pulse |
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Application publication date: 20120912 |