CN111509549B - High-peak power femtosecond laser negative/positive chirp pulse cascade amplification system - Google Patents
High-peak power femtosecond laser negative/positive chirp pulse cascade amplification system Download PDFInfo
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- CN111509549B CN111509549B CN202010278955.9A CN202010278955A CN111509549B CN 111509549 B CN111509549 B CN 111509549B CN 202010278955 A CN202010278955 A CN 202010278955A CN 111509549 B CN111509549 B CN 111509549B
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- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
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- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
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Abstract
A high-peak-power femtosecond laser negative/positive chirp pulse cascade amplification system is characterized in thatThe system is a mixed high peak power femtosecond laser system which takes negative chirp pulse amplification as a front end and positive chirp pulse amplification as a rear end. The system comprises a titanium gem mode-locked oscillator, a negative chirp pulse amplification front end, a pulse purification device and a positive chirp pulse amplification rear end. The invention can not only improve the contrast of the high peak power femtosecond laser, but also effectively compensate the residual fourth-order dispersion of the laser system without introducing a high-order dispersion compensation element, and finally realize that the contrast is higher than 10‑12And the high peak power femtosecond laser with the pulse width being the limit value of Fourier transform. In addition, the invention can inhibit the spectrum red shift in the laser amplification process, thereby obtaining wider amplified spectrum and shorter Fourier transform limit pulse width.
Description
Technical Field
The invention relates to chirped pulse amplification and dispersion compensation of a femtosecond laser system, in particular to compensation of residual fourth-order dispersion in a high-peak-power femtosecond laser system based on negative/positive chirped pulse cascade amplification. The high peak power means that the peak power of the laser reaches 1PW (10)15W) above.
Background
Since the invention of the chirp pulse amplification technology in the eighties, the chirp pulse amplification technology immediately becomes a main technical approach for improving the output peak power of a laser system, a plurality of laser laboratories at home and abroad successively carry out related research works, and the output peak power of ultrafast laser is rapidly developed, thereby promoting the continuous deepening of intense field ultrafast scientific research. With the increasing peak power and focus peak intensity of femtosecond pulses, pulse contrast becomes increasingly important. In order to improve the pulse contrast, a technical scheme of double chirped pulse amplification is generally adopted. Namely, the femtosecond seed laser with larger energy (hundreds of micro-joules to millijoules) output by the first-stage chirped pulse amplification system becomes high-contrast seed pulse with larger energy (micro-joules to millijoules) after passing through the pulse purification device. And injecting the high-contrast seed pulse into a second-stage chirped pulse amplification system for amplification, and finally outputting the high-contrast femtosecond pulse with high peak power. In a conventional double-chirped pulse amplification system, the first stage chirped pulse amplification system and the second stage chirped pulse amplification system both adopt a positive chirped pulse amplification mode.
In such a conventional dual-chirped pulse amplification system, it is usually necessary to compensate the residual fourth-order dispersion of the entire laser system by using high-order dispersion compensation devices such as a grating pair, a programmable acousto-optic modulator, and the like, so as to ensure that a compressed pulse output with a narrow pulse width is realized. However, the high-order dispersion compensation devices usually have high energy loss, which can greatly reduce the energy of the high-contrast seed pulse, thereby reducing the contrast of the high-peak power femtosecond laser output by the second-stage chirped pulse amplification system. Therefore, in the conventional double-chirped pulse amplification system, the high-order dispersion compensation can obviously affect the improvement of the pulse contrast. In addition, the spectral red shift in the amplification process of the positively chirped pulse is also one of the important factors that prevent short pulses from being obtained, and the amplified spectrum is narrowed by the severe spectral red shift, so that the pulse width is widened.
In order to overcome the technical problem, the invention provides a high-peak-power femtosecond laser negative/positive chirped pulse cascade amplification system. In the laser system, a high-order dispersion compensation device is not needed, and the dispersion compensation of the laser pulse, especially the compensation of the fourth-order dispersion can be effectively realized by optimizing the design of the first-stage negative chirped pulse amplification system and the second-stage positive chirped pulse amplification system. Therefore, high-quality compressed pulse output close to the Fourier transform limit can be realized under the condition of ensuring that the pulse contrast is not influenced. In addition, by utilizing mutual compensation of the blue shift of the spectrum amplified by the negative chirp pulse and the red shift of the spectrum amplified by the positive chirp pulse, wider amplified spectrum output can be realized, and thus shorter Fourier transform limit pulse width can be obtained. Compared with the traditional double-chirped pulse amplification laser system, the high-peak power femtosecond laser negative/positive chirped pulse cascade amplification system does not need to use a high-order dispersion compensation device, can save cost, and can simultaneously ensure two key laser parameters of high contrast and high-quality compressed pulses.
Disclosure of Invention
Aiming at the technical problems that in a traditional double-chirped pulse amplification system, pulse contrast is influenced by a high-order dispersion compensation device, spectrum red shift and the like, the invention provides a high-peak-power femtosecond laser negative/positive chirped pulse cascade amplification system. The system overcomes the problem of high-order dispersion compensation in the traditional double-chirp pulse amplification system, and can realize the contrast higher than 10 on the premise of not using a high-order dispersion compensation device by optimizing the design of the negative chirp pulse amplification front end and the positive chirp pulse amplification rear end-12And the high peak power femtosecond laser with the pulse width being the limit value of Fourier transform. In addition, the spectrum blue shift in the amplification of the front-end negative chirp pulse can be used for compensating the spectrum red shift in the amplification process of the rear-end positive chirp pulse, so that a wider amplified spectrum and a shorter Fourier transform limit pulse width are obtained.
The technical scheme adopted by the invention for solving the problems is as follows:
a high peak power femtosecond laser negative/positive chirped pulse cascade amplification system, comprising: the device comprises a titanium gem mode-locked oscillator, a negative chirp pulse amplification front end, a pulse purification device and a positive chirp pulse amplification rear end; the method is characterized in that femtosecond seed light generated by a titanium gem mode-locked oscillator is output to femtosecond light with the magnitude of several milli-joules by a negative chirp pulse amplification front end, then the femtosecond seed light enters a pulse purification device, and the femtosecond seed light is converted into femtosecond seed light with the contrast higher than 10 by the pulse purification device-12The femtosecond light is injected into the rear end of the positive chirp pulse amplification as new seed light, and finally the output contrast is higher than 10-12The pulse width is a femtosecond laser with high peak power of a Fourier transform limit value;
the second-order and third-order dispersion introduced by the negative chirp pulse amplification front end is zero, the fourth-order dispersion is negative, and the output femtosecond light energy is in the magnitude of millijoules;
the second-order and third-order dispersion introduced at the rear end of the amplification of the positively chirped pulse is zero, the fourth-order dispersion is positive, and the output femtosecond light energy is in the order of tens of joules;
the four-order dispersion quantity introduced by the negative chirp pulse amplification front end and the positive chirp pulse amplification back end (9) is equal.
The titanium gem mode-locked oscillator is a commercial titanium gem femtosecond oscillator and outputs an ultrashort pulse sequence with the central wave band of 800nm and 12 fs-15 fs;
the negative dispersion stretcher can be a grating pair or a prism pair, and the introduced dispersion quantity can stretch the femtosecond seed light to be more than 20 ps;
the pulse selector consists of a pair of Glan prisms and a PC box, so that not only can the menu be performed on the pulse sequence, but also the pulse contrast can be improved, and simultaneously, the introduced material dispersion is less;
the negative chirp pulse amplification front end comprises a negative dispersion stretcher, a pulse selector, a negative chirp pulse amplification chain and a positive dispersion compressor which are sequentially arranged along a light path; the negative chirp pulse amplification chain consists of a multi-pass amplifier and an Nd-YAG pump source for providing pumping for the multi-pass amplifier, wherein the multi-pass amplifier is a one-stage multi-pass amplifier or a two-stage multi-pass amplifier.
The positive dispersion compressor may be an optical glass or a chirped mirror.
The pulse purification device can be a cross polarization filter or a saturable absorber.
The positive dispersion stretcher can be an Offner type stretcher or a Martinez type stretcher, and the introduced dispersion amount is required to be capable of stretching the new femtosecond seed light to be more than 1 ns.
The positive chirp pulse amplification rear end comprises a positive dispersion stretcher, a positive chirp pulse amplification chain and a negative dispersion compressor which are sequentially arranged along a light path; the positive chirp pulse amplification chain comprises a first-stage multi-pass amplifier, a second-stage multi-pass amplifier, a once-to-say amplifier, an Nth-stage multi-pass amplifier and a high-energy pump source which are sequentially arranged along a light path, wherein the high-energy pump source provides a pump for each stage of multi-pass amplifier, and the energy of the high-energy pump source is greater than that of the Nd-YAG pump source.
The negative dispersion compressor may be a general double grating or a four grating structure.
Compared with the prior art, the invention has the following remarkable characteristics:
1. high-order dispersion compensation elements are not required to be introduced, pulse energy is not reduced, and therefore two important parameters of high contrast and near Fourier transform limit pulse width can be considered at the same time;
2. the spectrum red shift in the laser amplification process can be inhibited while the fourth-order dispersion is compensated, so that a wider amplified spectrum and a shorter Fourier transform limit pulse width are obtained.
Drawings
FIG. 1: the invention relates to a structural schematic diagram of a high peak power femtosecond laser negative/positive chirp pulse cascade amplification system;
FIG. 2: the invention discloses a structural schematic diagram of an embodiment of a high peak power femtosecond laser negative/positive chirped pulse cascade amplification system.
Detailed Description
The invention is further illustrated by the following examples in connection with the accompanying drawings.
Fig. 1 is a schematic structural diagram of a high peak power femtosecond laser negative/positive chirped pulse cascade amplification system of the present invention, including: the device comprises a titanium gem mode-locked oscillator 1, a negative chirp pulse amplification front end 2, a pulse purification device 8 and a positive chirp pulse amplification rear end 9; the femtosecond seed light generated by the titanium gem mode-locked oscillator 1 is firstly output femtosecond light with the magnitude of several milli-joules by the negative chirp pulse amplification front end 2 and then converted into femtosecond seed light with the contrast higher than 10 by the pulse purification device 8-12And as new seed light, injecting the new seed light into the rear end 9 of the positive chirp pulse amplification, and finally outputting the light with the contrast ratio higher than 10-12High peak power femtosecond laser with pulse width at the limit of Fourier transform.
Example (b):
fig. 2 is a schematic structural diagram of an embodiment of a high peak power femtosecond laser negative/positive chirped pulse cascade amplification system of the present invention, which mainly comprises a titanium sapphire mode-locked oscillator 1, a negative chirped pulse amplification front end 2, a pulse purification device 8, and a positive chirped pulse amplification back end 9. The negative chirped pulse amplification front end 2 comprises a negative dispersion stretcher 3, a pulse selector 4, a negative chirped pulse amplification chain and a positive dispersion compressor 7; the positive chirp pulse amplification back end 9 comprises a positive dispersion stretcher 10, a positive chirp pulse amplification chain and a negative dispersion compressor 16; the negative chirp pulse amplification chain comprises a primary multi-pass amplifier 5 and an Nd-YAG pump laser 6; the positively chirped pulse amplification chain comprises a first-stage multi-pass device 11, a second-stage multi-pass device 12, a third-stage multi-pass device 13, a fourth-stage multi-pass device 14 and a high-energy pump source 15.
The femtosecond seed light generated by the titanium gem mode-locked oscillator 1 is firstly expanded by the negative dispersion stretcher 3 to be changed into negative chirp picosecond light, then is changed into picosecond light with certain repetition frequency by the pulse selector 4, the picosecond light is amplified to a plurality of milli-focal orders by the multi-pass amplifier 6, then is compressed by the positive dispersion compressor 7 to output the milli-focal femtosecond light, and then is converted into femtosecond seed light with the contrast higher than 10 by the pulse purification device 8-12The high-energy femtosecond light is injected into the positive dispersion stretcher 10 as new seed light, stretched into positively chirped nanosecond light, amplified into high-energy nanosecond light with dozens of joule orders through the first-stage multi-pass amplifier 11, the second-stage multi-pass amplifier 12, the third-stage multi-pass amplifier 13 and the fourth-stage multi-pass amplifier 14 in sequence, and finally compressed by the negative dispersion compressor 16 to output the high-energy nanosecond light with the contrast higher than 10-12And a high peak power femtosecond laser with the pulse width being the limit value of Fourier transform.
In addition, the invention is not only suitable for PW-magnitude high-peak-power femtosecond laser systems, but also can be used for higher peak power and even EW (10)18W) laser system.
Claims (1)
1. A high peak power femtosecond laser negative/positive chirped pulse cascade amplification system, comprising: the device comprises a titanium gem mode-locked oscillator (1), a negative chirp pulse amplification front end (2), a pulse purification device (8) and a positive chirp pulse amplification rear end (9); it is characterized in that the femtosecond generated by the titanium gem mode-locked oscillator (1)The seed light is firstly output by the negative chirp pulse amplification front end (2) to be femtosecond light with the magnitude of several milli-joules, then enters the pulse purification device (8), and is converted into the light with the contrast ratio higher than 10 by the pulse purification device (8)-12Is injected into the rear end (9) of the positive chirp pulse amplification as new seed light, and finally the output contrast is higher than 10-12The pulse width is a femtosecond laser with high peak power of a Fourier transform limit value;
the second-order and third-order dispersion introduced by the negative chirp pulse amplification front end (2) is zero, the fourth-order dispersion is negative, and the output femtosecond light energy is in the millijoule level;
the second-order and third-order dispersion introduced by the positive chirp pulse amplification rear end (9) is zero, the fourth-order dispersion is positive, and the output femtosecond light energy is in the order of tens of joules;
the four-order dispersion quantity introduced by the negative chirp pulse amplification front end (2) and the positive chirp pulse amplification rear end (9) is equal;
the negative chirp pulse amplification front end (2) comprises a negative dispersion stretcher, a pulse selector, a negative chirp pulse amplification chain and a positive dispersion compressor which are sequentially arranged along a light path; the negative chirp pulse amplification chain consists of a multi-pass amplifier and an Nd, namely a YAG pump source which provides a pump for the multi-pass amplifier, wherein the multi-pass amplifier is a one-stage multi-pass amplifier or a two-stage multi-pass amplifier;
the positive chirp pulse amplification rear end (9) comprises a positive dispersion stretcher, a positive chirp pulse amplification chain and a negative dispersion compressor which are sequentially arranged along a light path; the positive chirp pulse amplification chain comprises a first-stage multi-pass amplifier, a second-stage multi-pass amplifier, a once-through amplifier, an Nth-stage multi-pass amplifier and a high-energy pump source which are sequentially arranged along a light path, wherein the high-energy pump source provides a pump for each stage of multi-pass amplifier, and the energy of the high-energy pump source is greater than that of an Nd-YAG pump source.
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| CN111999960B (en) * | 2020-08-20 | 2021-12-17 | 华中科技大学 | Positive/negative second-order dispersion obtaining method and system suitable for time domain optics |
| CN113437621B (en) * | 2021-06-17 | 2022-12-06 | 中国科学院上海光学精密机械研究所 | High-power laser time-space chirped pulse amplification system |
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| CN107247380A (en) * | 2017-08-11 | 2017-10-13 | 深圳大学 | A kind of pair of chirp frequency spectrum photoparametric amplifier and amplification method |
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| EP2320528A1 (en) * | 2009-11-10 | 2011-05-11 | Ecole Polytechnique | Source of short pulses of high-energy photons and method of generating a short pulse of high-energy photons |
| CN101814689A (en) * | 2010-04-08 | 2010-08-25 | 四川大学 | Method for improving signal-to-noise ratio of femtosecond laser by using chirp matched optical parametric chirped pulse amplification |
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