CN114665367A - High-conversion-efficiency optical parametric amplifier and amplification method thereof - Google Patents
High-conversion-efficiency optical parametric amplifier and amplification method thereof Download PDFInfo
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- CN114665367A CN114665367A CN202210139145.4A CN202210139145A CN114665367A CN 114665367 A CN114665367 A CN 114665367A CN 202210139145 A CN202210139145 A CN 202210139145A CN 114665367 A CN114665367 A CN 114665367A
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- H—ELECTRICITY
- 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
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094049—Guiding of the pump light
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- H—ELECTRICITY
- 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
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
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Abstract
The invention discloses an optical parametric amplifier with high conversion efficiency and an amplification method thereof, and the invention can realize two times of idle frequency light or signal light energy saturation by only placing two nonlinear crystals in a primary optical parametric amplifier, thereby improving the conversion efficiency of the optical parametric pulse amplifier without additionally adding a saturated amplifier with a delay line, and finally reducing the complexity of a system.
Description
Technical Field
The invention relates to the technical field of optical materials, in particular to an optical parametric amplifier with high conversion efficiency and an amplification method thereof.
Background
The ultrafast pulse laser has the advantages of high peak power, narrow pulse width and the like, so the ultrafast pulse laser has wide application prospect in the fields of industry, medical treatment, scientific research, national defense and the like. The optical parametric amplification and the optical parametric chirped pulse amplification become a preferred technical route for developing high-energy ultrafast pulse laser due to the technical advantages of high one-way gain, wide gain bandwidth, high performance-to-noise ratio, unobvious thermal distortion and the like. The optical parametric amplification means that a beam of high-energy pulse pump light and a beam of low-energy pulse signal light are simultaneously incident into a nonlinear crystal, when a certain phase matching condition is met, an idler frequency light is generated, and in the process of amplifying the signal light, the three beams accord with the law of energy conservation. The optical parametric chirped pulse amplification and the optical parametric amplification are different in that the chirped pulse light of picoseconds or even nanoseconds needs to be expanded before the pulse signal light enters the crystal, the pulse width after expansion is consistent with that of the pump light, and finally the amplified chirped signal light is decompressed back to femtosecond level by using a pulse compressor, so that the peak power of the amplified signal light can be obviously improved. However, the two technologies generally face the problem of low conversion efficiency, so how to design an efficient method to meet the application requirements of the industry and other fields for high-energy ultrashort pulse laser becomes a problem to be solved urgently.
Disclosure of Invention
The invention provides an optical parametric amplifier with high conversion efficiency and an amplification method thereof, which are used for solving the problem of low conversion efficiency in the optical parametric amplification process in the prior art.
In a first aspect, the present invention provides a high conversion efficiency optical parametric amplifier comprising: the device comprises a pump light 1, a pump beam shaper 2, a signal light 3, a signal beam shaper 4, a dichroic mirror 5, a first nonlinear crystal 6, a second nonlinear crystal 7 and an optical filter 8;
the pump beam shaper 2 is configured to shape the received pump light 1 into a converging light beam or a diverging light beam, which may be a gaussian light beam or a flat-top light beam;
the signal beam shaper 4 is configured to shape the received signal light 3 into a converging or diverging light beam (which may be a gaussian light beam or a flat-top light beam, of course) so that the converging or diverging light beam is matched with the shaped pump optical mode field on both the first nonlinear crystal 6 and the second nonlinear crystal 7;
the dichroic mirror 5 is used for spatially combining the shaped pump light and the signal light;
the first nonlinear crystal 6 is configured to perform first saturation amplification on the combined pump light and signal light, where the combined pump light and signal light meet a phase matching condition, and obtain attenuated pump light, amplified signal light, and idler frequency light;
the surface of the second nonlinear crystal 7 is plated with a preset film system, and when the pump light and the signal light processed by the first nonlinear crystal 6 pass through the preset film system, the idler frequency light is filtered out, and the distance between the second nonlinear crystal 7 and the first nonlinear crystal 6 is adjusted to obtain the pump light with preset light intensity, so that the signal light reaches the second saturation amplification;
and the optical filter 8 is used for filtering the pump light and the idler frequency light to obtain pure signal light.
The shaped pump light and the signal light coincide in time and space when entering the first nonlinear crystal 6 and the second nonlinear crystal 7.
Optionally, the pump light 1 and the signal light 3 are from the same laser or two lasers synchronized in time domain.
Alternatively, when the pump light 1 and the signal light 3 come from two time-domain synchronous lasers, the amplifier comprises a pulse pump laser and a pulse signal laser;
the pulse pump laser is used for generating the pump light 1;
the pulse signal laser is used for generating the signal light 3.
Optionally, the predetermined film system is a signal light high reflection film, a pump light and an idler frequency light reflection reducing film.
Optionally, the optical filter 8 is a long-pass filter or a band-pass filter.
Optionally, the central wavelength of the pump light 1 is 1030nm, the pulse width is 400fs, and the single-pulse energy is 1mJ of femtosecond laser pulses;
the central wavelength of the signal light 3 is 1393.3nm, the pulse width is 400fs, and the single pulse energy is 0.5 muJ femtosecond laser pulse.
In a second aspect, the present invention provides a method of optical parametric amplification based on the amplifier of any one of the preceding claims, the method comprising:
shaping a pump light beam 1 by a pump light beam shaper 2 to form a convergent or divergent light beam with a preset divergent angle, and simultaneously shaping a signal light beam 3 by a signal light beam shaper 4 to form a convergent or divergent light beam with the preset divergent angle;
the shaped pump light 1 and the shaped signal light 3 are subjected to spatial beam combination through a dichroic mirror 5, and are incident to the first nonlinear crystal 6 to be subjected to first saturation amplification, so that attenuated pump light, amplified signal light and amplified idler frequency light are obtained;
the attenuated pump light, the attenuated signal light and the attenuated idler frequency light are incident on the second nonlinear crystal 7, the idler frequency light is filtered when passing through a preset film system on the second nonlinear crystal 7, the distance between the second nonlinear crystal 7 and the first nonlinear crystal 6 is adjusted to obtain the pump light with preset light intensity, and meanwhile, the signal light is subjected to second saturation amplification;
and filtering the pump light and the idler frequency light through an optical filter to obtain pure signal light.
Optionally, the pump light 1 and the signal light 3 are from the same laser or two lasers synchronized in time domain;
when the pump light 1 and the signal light 3 come from two time domain synchronous lasers, the amplifier comprises a pulse pump laser and a pulse signal laser;
the pulse pump laser is used for generating the pump light 1;
the pulse signal laser is used for generating the signal light 3.
Optionally, the predetermined film is a signal light high reflection film, a pump light and an idler frequency light antireflection film.
The invention has the following beneficial effects:
the invention can realize the two times of idle frequency light or signal light energy saturation by only placing two nonlinear crystals in the first-stage optical parametric amplifier, and can improve the conversion efficiency of the optical parametric pulse amplifier.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic structural diagram of an optical parametric amplifier with high conversion efficiency according to a first embodiment of the present invention;
FIG. 2a is a schematic diagram illustrating incident light of a second nonlinear crystal coated with a signal light high-reflection film, a pump light and an idler light anti-reflection film according to a first embodiment of the present invention;
FIG. 2b is a schematic diagram illustrating incident light of a second nonlinear crystal coated with an idler-light high-reflection film, a pump-light and a signal-light anti-reflection film according to the first embodiment of the present invention;
fig. 3 is a graph illustrating the variation of the conversion efficiency of the idler at different positions of the nonlinear crystal according to the first embodiment of the present invention.
Detailed Description
The embodiment of the invention aims at the problems that the conversion efficiency is low commonly encountered in the existing optical parametric chirped pulse amplification and optical parametric amplification, and the problems that the device volume of a high-energy optical parametric amplification system is too large and the cost is too high are directly encountered by the solution scheme with low conversion efficiency by improving the average power and the pulse energy of a pump laser source at present.
In addition, considering that factors influencing conversion efficiency in all parametric processes at present except quantum loss of light-light, the more important problem is energy backflow, which means that during parametric conversion, amplified energy of signal light and idler light exceeds that of pump light, and backflow is carried out towards the direction of the pump light, at this time, the energy of the pump light is not completely exhausted, so that the conversion efficiency cannot be further improved, and the energy of the finally amplified idler light or signal light pulse is influenced.
By the arrangement, two pieces of nonlinear crystals are arranged in the first-stage optical parametric amplifier to realize the two times of idle frequency light or signal light energy saturation, so that the conversion efficiency of the optical parametric pulse amplifier is improved, a saturated amplifier with a delay line is not required to be additionally arranged, and the system complexity is reduced. And because the surface of the second nonlinear crystal is plated with the signal light or idler frequency light high-reflection film, the second nonlinear crystal can filter the signal light or idler frequency light, and only other light beams enter the crystal, so that reverse energy conversion is avoided, and the energy conversion efficiency is greatly improved. And secondly, because the use of a filter plate is avoided, the time domain walk-off among the pump light, the signal light and the idle frequency light is reduced, so that the method is not only suitable for picosecond nanosecond pulse amplification but also suitable for direct amplification of femtosecond pulses.
The present invention will be described in further detail below with reference to the drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
A first embodiment of the present invention provides a high conversion efficiency optical parametric amplifier, see fig. 1, comprising: the device comprises a pump light 1, a pump beam shaper 2, a signal light 3, a signal beam shaper 4, a dichroic mirror 5, a first nonlinear crystal 6, a second nonlinear crystal 7 and an optical filter 8;
the pump beam shaper 2 is used for shaping the received pump light 1 into a convergent beam or a divergent beam;
the signal beam shaper 4 is configured to shape the received signal light 3 into a converging or diverging beam, so that the converging or diverging beam is matched with the shaped pump optical mode field on both the first nonlinear crystal 6 and the second nonlinear crystal 7;
the dichroic mirror 5 is used for spatially combining the shaped pump light and the signal light;
the first nonlinear crystal 6 is configured to perform first saturation amplification on the combined pump light and signal light, where the combined pump light and signal light meet a phase matching condition, and obtain attenuated pump light, amplified signal light, and idler frequency light;
the surface of the second nonlinear crystal 7 is plated with a preset film system, and when the pump light and the signal light processed by the first nonlinear crystal 6 pass through the preset film system, the idler frequency light is filtered out, and the distance between the second nonlinear crystal 7 and the first nonlinear crystal 6 is adjusted to obtain the pump light with preset light intensity, so that the signal light reaches the second saturation amplification; the preset film in the embodiment of the invention is a signal light high reflection film, a pump light and idler frequency light reflection reducing film.
As shown in fig. 2a and 2b, the second nonlinear crystal of the embodiment of the present invention has a surface coated with a high reflective film for signal light and idler light, respectively, and it can be seen from the figure that the signal light or idler light can be directly filtered out by the predetermined film system coated on the second nonlinear crystal 7. And the idler frequency light or the signal light is subjected to second saturation amplification by adjusting the positions of the first nonlinear crystal and the second nonlinear crystal. And finally, a filter is adopted to obtain pure signal light or idler frequency light.
As shown in fig. 3, by adjusting the distance between the second nonlinear crystal 7 and the first nonlinear crystal 6, the embodiment of the present invention may obtain a graph of the change of the conversion efficiency of the idler at different positions of the nonlinear crystal, and according to the graph, the optimal thickness of the final second nonlinear crystal 7 and the first nonlinear crystal 6 may be determined.
In practical implementation, the shaped pump light and the signal light are temporally and spatially coincident when entering the first nonlinear crystal 6 and the second nonlinear crystal 7. To ensure that the entire scheme can perform properly.
And the optical filter 8 is used for filtering the pump light and the signal light to obtain pure idler frequency light. The filter 8 is a long pass filter or a band pass filter. The specific setting can be arbitrarily set by those skilled in the art according to the actual needs, and the present invention is not particularly limited to this.
That is to say, in the embodiment of the present invention, two nonlinear crystals are placed in the first-stage optical parametric amplifier, so that the idler frequency light or signal light energy saturation can be achieved twice, and the conversion efficiency of the optical parametric pulse amplifier can be improved.
In specific implementation, the pump light 1 and the signal light 3 in the embodiment of the present invention are from the same laser or two lasers synchronized in time domain.
When the pump light 1 and the signal light 3 come from two time domain synchronous lasers, the amplifier comprises a pulse pump laser and a pulse signal laser;
in the embodiment of the present invention, the pump light 1 is generated by the pulse pump laser, and the signal light 3 is generated by the pulse signal laser.
The amplifier according to the invention will be explained and illustrated in detail below by means of a specific embodiment:
the optical parametric amplification method with high conversion efficiency provided by the embodiment of the invention comprises the following steps:
1. the pump light is beam-shaped to become a converging or diverging beam (gaussian beam or flat-top beam) with a certain divergence angle.
2. The signal light is shaped into a converging or diverging beam (gaussian beam or flat-top beam) having a certain divergence angle.
3. The shaped pump light and the signal light are spatially combined through the dichroic mirror and enter the first nonlinear crystal, and first saturation amplification is realized by adjusting the size of light spots of the pump light and the signal light on the crystal to obtain attenuated pump light and amplified signal light and idler frequency light.
4. The amplified signal light, idler frequency light and attenuated pump light are incident into the second nonlinear crystal again, the surface of the nonlinear crystal is plated with a signal light high-reflection film, a pump and idler frequency light antireflection film, only the pump light and the idler frequency light enter the crystal, and the idler frequency light is subjected to second saturation amplification by adjusting the distance between the first nonlinear crystal and the second nonlinear crystal, namely the intensity of the pump light.
5. The optical filter filters the residual pump light and the signal light to obtain the finally required idler frequency light.
Specifically, as shown in fig. 1, the present invention provides an optical parametric amplifier with high conversion efficiency, which includes: the device comprises pump light 1, a pump beam shaper 2, signal light 3, a signal beam shaper 4, a dichroic mirror 5, a first nonlinear crystal 6, a second nonlinear crystal 7 and a long-pass optical filter 8.
The pump light 1 is beam-shaped by a pump beam shaper 2 into a flat-topped or gaussian beam. The signal light 3 is beam-shaped by a signal beam shaper 4 to match the shaped pump laser. The shaped pump light and the signal light are synchronously coupled into a first nonlinear crystal 6 through a dichroic mirror 5, and first optical parametric amplification is carried out to obtain amplified signal light, idler frequency light and attenuated pump light. The amplified signal light, the idler frequency light and the attenuated pump light are input into the second nonlinear crystal 7 together, and the surface of the input end of the crystal is plated with a signal light high-reflection film, so that the problem of energy backflow does not exist in secondary parametric amplification, the energy of the pump light can be continuously transferred to the signal light and the idler frequency light, and the conversion efficiency is greatly improved. And finally, filtering the residual pump light and signal light by using a long-pass optical filter 8 to obtain a finally required pure idler frequency optical signal.
In the embodiment of the invention, the pulse pumping laser adopts femtosecond laser pulse with the central wavelength of 1030nm, the pulse width of 400fs and the single-pulse energy of 1 mJ. The pulse signal laser adopts femtosecond laser pulses with the center wavelength of 1393.3nm, the pulse width of 400fs and the single-pulse energy of 0.5 muJ. The pulse pump laser is adjusted into a flat-top beam through a beam shaper, and the pulse signal laser is adjusted into a flat-top beam through the beam shaper in order to match the pump beam, so that the two beams of light are combined by a dichroic mirror and then input into a first nonlinear crystal KTA to meet the two types of phase matching, and primary optical parametric amplification is carried out to generate 3950.2 nm idle frequency light and amplified 1393.3nm signal light. The idler frequency light is saturated and amplified by adjusting the sizes of the pump light spot and the signal light spot on the crystal. And then the amplified signal light, idler frequency light and attenuated pump light are incident into a second nonlinear crystal KTA again for second optical parametric amplification, and a signal light high-reflection film, a pumping film and an idler frequency light antireflection film are plated on the surface of the crystal, so that the signal light is directly filtered, and only the pumping light and the idler frequency light are transmitted, and the amplified idler frequency light and the attenuated pump light are further obtained. And the idler frequency light is subjected to second saturation amplification by adjusting the positions of the first nonlinear crystal and the second nonlinear crystal. And finally, filtering the pump light and the signal light by using a long-pass filter to obtain the amplified idler frequency light pulse.
FIG. 2 shows the variation of the conversion efficiency of the idler at different positions of the nonlinear crystal. In a single KTA crystal, the idler frequency light is continuously amplified before the thickness of the crystal is 1.7mm, the energy saturation is achieved at the position of 1.7mm, the output power reaches 150 mu J, and the conversion efficiency is 15.0%. As the length of the crystal increases, the power of the signal light and the idler frequency light exceeds that of the pump light, and the phenomenon of energy reverse conversion occurs. In order to avoid energy reverse flow, 1393.3nm signal light is stripped at a position of 1.7mm, and only idler light and pump light interact in the last 0.5mm crystal, and it can be obviously found from a black dotted line in the figure that the energy reverse flow is effectively inhibited, the conversion efficiency is further improved, saturation is achieved at a position of 2.2mm, the conversion efficiency reaches 22.5%, and the conversion efficiency of optical parametric amplification is greatly improved.
The above results show that the two idler frequency light energy saturations can be realized only by placing two nonlinear crystals in the first-stage optical parametric amplifier, and the second nonlinear crystal is coated with a signal light high-reflection film on the surface, so that the signal light can be filtered, only the pump light and the idler frequency light enter the crystal, thereby avoiding energy inverse conversion, and remarkably improving the energy conversion efficiency.
In accordance with a second embodiment of the present invention, there is provided a method of optical parametric amplification based on the amplifier according to any of the first embodiments of the present invention, the method comprising:
shaping the pump light 1 into a convergent or divergent light beam with a preset divergence angle by a pump light beam shaper 2, and shaping the signal light 3 into a convergent or divergent light beam with a preset divergence angle by a signal light beam shaper 4;
the shaped pump light 1 and the shaped signal light 3 are spatially combined through a dichroic mirror 5, and are incident to the first nonlinear crystal 6 for first saturation amplification, so that attenuated pump light, amplified signal light and amplified idler frequency light are obtained;
the attenuated pump light, the attenuated signal light and the attenuated idler frequency light are incident on the second nonlinear crystal 7, the idler frequency light is filtered when passing through a preset film system on the second nonlinear crystal 7, the distance between the second nonlinear crystal 7 and the first nonlinear crystal 6 is adjusted to obtain the pump light with preset light intensity, and meanwhile, the signal light is subjected to second saturation amplification;
and filtering the pump light and the idler frequency light through an optical filter to obtain pure signal light.
Specifically, the pump light 1 and the signal light 3 in the embodiment of the present invention are from the same laser or two lasers synchronized in time domain;
when the pump light 1 and the signal light 3 come from two time domain synchronous lasers, the amplifier comprises a pulse pump laser and a pulse signal laser;
the pulse pump laser is used for generating the pump light 1;
the pulse signal laser is used for generating the signal light 3.
The relevant content of the embodiments of the present invention can be understood by referring to the first embodiment of the present invention, and will not be discussed in detail herein.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, and the scope of the invention should not be limited to the embodiments described above.
Claims (10)
1. A high conversion efficiency optical parametric amplifier, comprising: the device comprises a pump light (1), a pump beam shaper (2), a signal light (3), a signal beam shaper (4), a dichroic mirror (5), a first nonlinear crystal (6), a second nonlinear crystal (7) and an optical filter (8);
the pump beam shaper (2) is used for shaping the received pump light (1) into a convergent light beam or a divergent light beam;
the signal beam shaper (4) is used for shaping the received signal light (3) into a convergent or divergent light beam so that the convergent or divergent light beam is matched with the shaped pump optical mode field on the first nonlinear crystal (6) and the second nonlinear crystal (7);
the dichroic mirror (5) is used for spatially combining the shaped pump light and the signal light;
the first nonlinear crystal (6) is used for performing first saturation amplification on the combined pump light and signal light to enable the combined pump light and signal light to meet a phase matching condition, so that attenuated pump light, amplified signal light and idler frequency light are obtained;
the surface of the second nonlinear crystal (7) is plated with a preset film system, and when the pump light, the signal light and the idler frequency light processed by the first nonlinear crystal (6) pass through the preset film system, the signal light is filtered when the preset film system is a signal light high reflection film, a pump light and idler frequency light antireflection film; when the preset film is an idler frequency light high-reflection film, a pumping light and an idler frequency light antireflection film, the idler frequency light is filtered, the pumping light with preset light intensity is obtained by adjusting the distance between the second nonlinear crystal (7) and the first nonlinear crystal (6), and meanwhile, the signal light or the idler frequency light is subjected to second saturation amplification;
the optical filter (8) filters other irrelevant beams according to the laser band to be amplified finally to obtain pure signal light or idler frequency light.
2. The amplifier of claim 1,
the shaped pump light and the signal light are coincident in time and space when entering the first nonlinear crystal (6) and the second nonlinear crystal (7).
3. The amplifier of claim 1,
the pump light (1) and the signal light (3) come from the same laser or two lasers with synchronous time domain.
4. Amplifier according to claim 3, characterized in that the amplifier comprises a pulsed pump laser and a pulsed signal laser when the pump light (1) and the signal light (3) come from two time domain synchronous lasers;
the pulsed pump laser for generating the pump light (1);
the pulse signal laser is used for generating the signal light (3).
5. Amplifier according to any of claims 1-4,
the preset film system is a signal light high-reflection film, a pumping light and idler frequency light antireflection film or an idler frequency light high-reflection film, a pumping light and a signal light antireflection film.
6. Amplifier according to any of claims 1-4,
the optical filter (8) is a long-pass filter or a band-pass filter.
7. Amplifier according to any of claims 1-4,
the center wavelength of the pump light (1) is 1030nm, the pulse width is 400fs, and the single-pulse energy is 1mJ femtosecond laser pulse;
the central wavelength of the signal light (3) is 1393.3nm, the pulse width is 400fs, and the single-pulse energy is 0.5 muJ femtosecond laser pulse.
8. A method of optical parametric amplification based on the amplifier of any one of claims 1-7, comprising:
shaping the beam of the pump light (1) by a pump beam shaper (2) to form a convergent or divergent beam with a preset divergence angle, and shaping the beam of the signal light (3) by a signal beam shaper (4) to form a convergent or divergent beam with a preset divergence angle;
the shaped pump light (1) and the signal light (3) are subjected to spatial beam combination through a dichroic mirror (5), and are incident to the first nonlinear crystal (6) to be subjected to first saturation amplification, so that attenuated pump light, amplified signal light and amplified idler frequency light are obtained;
the attenuated pump light, the attenuated signal light and the attenuated idler frequency light are incident on the second nonlinear crystal (7), when the attenuated pump light, the attenuated signal light and the attenuated idler frequency light pass through a preset film system on the second nonlinear crystal (7), the attenuated signal light or the attenuated idler frequency light is filtered, the distance between the second nonlinear crystal (7) and the first nonlinear crystal (6) is adjusted, so that the pump light with preset light intensity is obtained, and meanwhile, the signal light or the idler frequency light is subjected to second saturation amplification;
other irrelevant beams are filtered by the optical filter to obtain pure signal light or idler frequency light.
9. The method of claim 1,
the pump light (1) and the signal light (3) come from the same laser or two lasers with synchronous time domain;
when the pump light (1) and the signal light (3) come from two time domain synchronous lasers, the amplifier comprises a pulse pump laser and a pulse signal laser;
the pulsed pump laser for generating the pump light (1);
the pulse signal laser is used for generating the signal light (3).
10. The method according to claim 8 or 9,
the preset film system is a signal light high-reflection film, a pumping light and idler frequency light antireflection film or an idler frequency light high-reflection film, a pumping light and a signal light antireflection film.
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