CN112164970B - Optical parametric amplification device for signal light in any polarization state - Google Patents
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Abstract
A parametric amplification device of signal light in any polarization state comprises a pump light source module, a horizontal polarization parametric amplification module and a vertical polarization parametric amplification module; the pump light source module outputs two paths of pump light with mutually vertical polarization directions as two paths of incident light, wherein S polarized pump light is incident to the horizontal polarization parametric amplification module, and P polarized pump light is incident to the vertical polarization parametric amplification module; the invention can carry out parametric amplification on broadband signal light in any polarization state, thereby realizing parametric amplification on other polarized light except linearly polarized light, adjusting the amplification factor of P or S polarization by controlling the initial polarization state of input signal light, and quantitatively controlling the polarization state of output light beams by adding a compensation component.
Description
Technical Field
The invention relates to the field of broadband random polarization state laser systems, in particular to an optical parametric amplification device for random polarization state signal light.
Background
In the existing ultrashort pulse laser system, there are two obstacles to the control of the polarization state of the signal light, one is that the wavelength corresponding to the optical polarization components such as the slide polariton faraday is generally corresponding to the narrow band, and there is a limitation (spectrum loss) to the control of the polarization state of the wide band; secondly, when the amplified signal light ratio is strong, the geometric size of the polarization adjusting component is also greatly limited by the damage threshold and the processing technology.
In the prior broadband signal amplifying device, particularly in a device amplifying in a parametric amplification mode, an amplified output signal is generally output in a linearly polarized light state, no relevant report on parametric amplification of broadband light in other polarization states exists, corresponding to the prior relevant ultrashort pulse laser output, particularly ultrashort pulse laser output in TW and PW levels, relevant products are linearly polarized light output, and no effective amplifying means exists at present for the output conditions of needing larger energy and special polarization states.
Disclosure of Invention
The invention provides a device which can be universally used for optical parametric amplification of broadband signals in any polarization state. The broadband signal light in any polarization state can be subjected to parametric amplification, so that parametric amplification of other polarized light except linearly polarized light is realized. Compared with the traditional optical parametric amplification technology, the device has the advantages that the two independent optical parametric amplification modules respectively amplify two polarization components of signal light perpendicular to each other in the two modules in a mode of vertically placing the crystal (along the direction of a light beam), and finally the synthesized signal light is output. The device can amplify broadband signal light in any polarization state in principle. Meanwhile, the state of the amplified polarized light which is finally output can be adjusted by controlling the intensity of the pump light in the device, pre-adjusting the polarization state of the input signal light before amplification and the like.
The technical solution of the invention is as follows:
a parametric amplification device for signal light in any polarization state is characterized in that: the device comprises a pumping light source module, a horizontal polarization parametric amplification module and a vertical polarization parametric amplification module;
the pump light source module outputs two paths of pump light with mutually vertical polarization directions as two paths of incident light, wherein S polarized pump light is incident to the horizontal polarization parametric amplification module, and P polarized pump light is incident to the vertical polarization parametric amplification module;
the signal light in any polarization state is incident to the horizontal polarization parametric amplification module, the synchronization and the coincidence of the S polarization pump light and the signal light in time and space are kept, and the incident angle of the S polarization pump light and the signal light and the placement state of the horizontal polarization parametric amplification module meet the non-collinear matching condition, so that the signal light in the P polarization direction in the signal light is amplified, and the signal light in the S polarization direction is kept unchanged; the signal light amplified in the P polarization direction enters the vertical polarization parametric amplification module (S), the synchronization and the coincidence of the time and the space of the P polarization pump light and the signal light are kept, and the incidence angle of the P polarization pump light and the signal light and the placement state of the vertical polarization parametric amplification module meet the non-collinear matching condition, so that the signal light in the S polarization direction in the signal light is amplified, and the light energy of the signal light in the P polarization direction is kept unchanged.
The light intensity, the beam aperture and the pulse broadband of the P polarized pump light and the S polarized pump light are consistent.
The time difference between the two paths of pump light and between the pump light and the signal light pulse can be adjusted, and the time jitter is as small as possible.
The pulse width of the S polarized pump light is slightly smaller than that of the signal light, the beam aperture of the S polarized pump light is slightly smaller than that of the signal light, the pulse width of the P polarized pump light is slightly smaller than that of the signal light, and the beam aperture of the P polarized pump light is slightly smaller than that of the signal light.
8. The pumping light source module comprises a first half wave plate, a second half slide, a first beam reducing device, a second beam reducing device, a first pumping light reflecting mirror and a second pumping light reflecting mirror; two paths of linearly polarized light pump light are respectively adjusted by a first half-wave plate and a second half-slide in respective light paths, so that the polarization directions of the two paths of pump light are mutually vertical, one path of pump light is P polarized light, the other path of pump light is S polarized light, pump light with proper light intensity is obtained by a first beam reducing device and a second beam reducing device of the respective light paths, and then the pump light is respectively guided into the horizontal polarization parameter amplification module and the vertical polarization parameter amplification module by a first pump light reflecting mirror and a second pump light reflecting mirror of the respective light paths.
The first half-wave plate and the second half-wave plate are both narrow-band pump light half-wave plates.
The horizontal polarization parametric amplification module comprises a first beam splitter mirror, a first p-polarization parametric amplification nonlinear crystal, a second beam splitter mirror, a first signal light reflector, a third pumping light reflector, a third beam splitter mirror, a second p-polarization parametric amplification nonlinear crystal, a fourth beam splitter mirror and a second signal light reflector; the vertical polarization parametric amplification module comprises a fifth light splitting reflector, a first s polarization parametric amplification nonlinear crystal, a sixth light splitting reflector, a third signal light reflector, a fourth pumping reflector, a seventh light splitting reflector, a second s polarization parametric amplification nonlinear crystal, an eighth light splitting reflector and a fourth signal light reflector;
the signal light in any polarization state is reflected by the first light splitting reflector and then injected into the first P polarization parametric amplification crystal, meanwhile, the S polarization pump light is transmitted by the first light splitting reflector and then injected into the first P polarization parametric amplification crystal, the time and the space of the signal light and the S polarization pump light are kept synchronous and coincident, and the incident angle of the signal light and the S polarization pump light and the placement state of the first P polarization parametric amplification nonlinear crystal meet the conditions of non-collinear matching, so that the signal light in the P polarization direction in the signal light is amplified in a first stage, and the signal light in the S polarization direction is kept unchanged; the amplified signal light is injected into a second p-polarization parametric amplification nonlinear crystal after being reflected by the second beam splitting reflector, the first signal light reflector and the third beam splitting reflector in sequence; the pump light surplus and idle light output by the same path are transmitted by the second beam splitting reflector and then reach a third pump light reflector, the pump light is reflected by the third pump light reflector and then transmitted by the third beam splitting reflector and then is also injected into the second P-polarization parameter amplification nonlinear crystal, and the incident angle of the signal light and the pump light and the placement state of the second P-polarization parameter amplification nonlinear crystal meet the condition of non-collinear matching, so that the signal light in the P polarization direction in the signal light is further amplified to a stable region, and the signal light in the S polarization direction is still unchanged; the amplified signal light in the P polarization direction is reflected by a fourth light-dividing reflector, a second signal light-dividing reflector and a fifth light-dividing reflector in sequence, and then injected into a first S-polarization parameter amplification nonlinear crystal, meanwhile, the P polarization pump light is transmitted by the fifth light-dividing reflector and then injected into the first S-polarization parameter amplification nonlinear crystal, in the first S-polarization parameter amplification nonlinear crystal, the incident angle of the pump light and the signal light and the placement state of the first S-polarization parameter amplification nonlinear crystal meet the non-collinear matching condition, so that the signal light in the S polarization direction in the signal light is amplified, and the light energy of the signal light in the P polarization direction is kept unchanged; the signal light amplified in the S polarization direction enters a second S-polarization parameter amplification nonlinear crystal after being reflected by the sixth light splitting reflector, the third signal light reflecting mirror and the seventh light splitting reflector in sequence, meanwhile, the pump light allowance is transmitted by the sixth light splitting reflector, reflected by the fourth pump light reflecting mirror, transmitted by the seventh light splitting reflector and injected into the second S-polarization parameter amplification nonlinear crystal, and the incident angle of the signal light and the pump light in the second S-polarization parameter amplification nonlinear crystal and the crystal placement state meet the non-collinear matching condition, so that the S polarization direction in the signal light is amplified, and the signal light after being reflected by the eighth light splitting reflector and the fourth signal light reflecting mirror outputs the polarization signal light after vector superposition.
The placement direction of the nonlinear crystal in the p-polarization signal optical parametric amplification module is perpendicular to the placement direction of the nonlinear crystal used in the s-polarization signal optical parametric amplification module (along the light beam transmission direction), the cutting parameters of the first p-polarization parametric amplification nonlinear crystal and the second p-polarization parametric amplification nonlinear crystal are kept consistent, and the cutting parameters of the first s-polarization parametric amplification nonlinear crystal and the second s-polarization parametric amplification nonlinear crystal are kept consistent.
The length and the number of the crystals depend on the light intensity of the injected signal light and the light intensity of the pumping light, and the specific design parameters need to be based on specific use parameters.
The crystal is a uniaxial and biaxial parametric amplification crystal and comprises BBO, LBO, YCOB, DKDP, KDP or KTP.
The polarization adjusting unit is used for adjusting the polarization state of signal light in any polarization state, and then the signal light enters the first light splitting reflector.
The polarization adjusting unit is a glass slide, an optical rotation sheet, a Faraday and a special polarization device.
And the output polarization state is changed by controlling the light intensity of the two paths of pump light, and the amplified signal light in any polarization state is finally obtained.
The device can solve the problem of amplifying broadband signal light in any polarization state by using a parametric amplification principle, and can perform optical parametric amplification on incident signal light in any polarization state. The amplification factor of P or S polarization can be adjusted by controlling the initial polarization state of the input signal light, and a compensation component is added to quantitatively control the polarization state of the output light beam. The device can be widely applied to an ultrashort pulse laser system, and is particularly suitable for the condition of large-caliber large-energy output under the condition that specific polarized light needs to be amplified.
The invention has the technical effects that:
1) In the amplification process of the device, input polarized light can be decomposed into two independent amplification processes of P-direction polarization parametric amplification and S-direction parametric amplification, the conversion efficiency of pump light is more than 40%, and finally parametric amplification of broadband signal light in any polarization state can be realized.
2) Due to the characteristic of broadband amplification in the parametric amplification process, when the signal light is fully amplified to a stable region, the bandwidth of the broadband signal light can be fully guaranteed.
3) By adjusting the parametric amplification proportion in the horizontal and vertical directions and the phase difference between the e-o components, the terminal polarization state of the output amplified signal can be flexibly controlled.
4) The device can be widely applied to the amplification output of the polarization signal except the linearly polarized light in the ultrashort pulse laser system.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a parametric amplification device for signal light in an arbitrary polarization state according to the present invention;
FIG. 2 is a schematic diagram of the vertical arrangement of crystals in a p-polarization parametric amplification module and an s-polarization parametric amplification module according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a parametric amplification device for signal light in any polarization state according to the present invention, and as shown in the drawing, the parametric amplification device includes a pump light source module and a parametric amplification module, where the pump light module mainly includes a beam reduction device (better kepler type), a half-wave plate (narrow band), and a 45-degree pump light reflector (high damage threshold), and has a function of providing two pump light beams, respectively, where the two pump light beams are linearly polarized light, and output polarization directions of the two pump light beams are adjusted by adjusting angles of the respective half-wave plates, and in general, polarization directions of the two pump light beams are adjusted to two polarization directions perpendicular to each other, that is, p and s polarizations perpendicular to each other. The time synchronization jitter between the two pumping light paths is controlled within 100ps, the relative time difference of the pumping pulses between the two pumping light paths can be adjusted, and the pumping pulses are obtained by splitting the pumping light beams of the same path in an ideal state. The pump light pulse width is determined according to the pulse width condition of the amplified signal light. The effect of the beam-reducing device (generally between 500ps-5 ns) is to adjust the light intensity of the output pump light to a suitable range, such as using Keplerian structure beam-reducing, and the image transfer relationship can be considered, so that the near-field distribution of the pump light falling on the crystal is relatively uniform.
The device specifically comprises a first half-wave plate 1, a second half-slide 4, a first beam reduction device 2, a second beam reduction device 5, a first pump light reflecting mirror 3 and a second pump light reflecting mirror 6. Two paths of input pump light are linearly polarized light, the polarization directions of the two paths of pump light are mutually vertical through the adjustment of the first half-wave plate 1 and the second half-wave plate 4 in respective light paths, one path of pump light is P polarized light, the other path of pump light is S polarized light, pump light with proper light intensity is obtained through the first beam reducing device 2 and the second beam reducing device 5 of the respective light paths, the pump light is respectively led into the parametric amplification unit through the first pump light reflecting mirror 3 and the second pump light reflecting mirror 6, and the energy of the two paths of pump light is generally set to be consistent with the output light intensity led into the parametric amplification unit except the polarization directions which are mutually vertical in principle. The time difference between the pump light and the signal light pulse between the two pump lights is required to be adjustable, and the time jitter is as small as possible (ideally, the pump light is provided after being split by the same light source). The first half-wave plate and the second half-wave plate are both narrow-band pump light half-wave plates.
In the parametric amplification module, main components comprise two groups of parametric amplification nonlinear crystals with consistent parameters, a broadband signal light 45-degree reflector, a reflection light splitting (synthesizing) mirror (signal light 45-degree reflection, pump light and idle light 45-degree transmission) and the like; the parametric amplification unit comprises two parts: the first part is a horizontal polarization parametric amplification module which is characterized in that the polarization direction of pump light is S polarization, the placement direction of a nonlinear crystal meets the non-collinear I-type matching requirement, and a p-polarization direction signal in signal light is fully amplified in the crystal and is output to a subsequent module amplification module after being amplified to a stable region; the second part is a vertical polarization parametric amplification module, and is characterized in that the polarization direction of pump light is P polarization, the crystal placing direction is mutually perpendicular to the crystal placing direction of the first part, the placing direction meets the non-collinear I-type matching requirement, S polarization direction signals in signal light are fully amplified in the crystal and output after reaching a stable region, the strength of the P polarization direction signals amplified in the first unit in the signal light is kept unchanged (the parametric amplification matching condition is not met), and finally light beams are output by vector synthesis of two polarization directions (P and S) (the crystals of the two units are consistent, and the crystal length is consistent with the cutting angle).
The device specifically comprises a horizontal polarization P parameter amplification module which is composed of a polarization adjusting unit 7, a first light splitting reflector 8, a second light splitting reflector 10, a first signal light reflector 11, a third pumping light reflector 12, a third light splitting reflector 14, a first P-polarization parameter amplification nonlinear crystal 9, a second P-polarization parameter amplification nonlinear crystal 15, a fourth light splitting reflector 16, a second signal light reflector 18, a first light collector 13 and a second light collector 17. The vertical polarization S parametric amplification module is composed of a fifth light splitting reflector 19, a sixth light splitting reflector 22, a third signal light reflector 23, a fourth pumping reflector 24, a seventh light splitting reflector 26, a first S polarization parametric amplification nonlinear crystal 20, a second S polarization parametric amplification nonlinear crystal 27, an eighth light splitting reflector 28, a fourth signal light reflector 30, a third light collector 25 and a fourth light collector 29.
In this embodiment, signal light in any polarization state is modulated (or cancelled as the case may be) by the polarization modulation unit 7, and then injected into the first p-polarization parametric amplification nonlinear crystal 9 by the first beam splitter mirror 8, and simultaneously the path of S-polarized pump light also reaches the first p-polarization parametric amplification nonlinear crystal 9 by passing through the first beam splitter mirror 8, the two beams of light keep time and space synchronization and coincide, in principle, the pulse width of the pump light is slightly smaller than the pulse width of the signal light, and the beam diameter of the pump light is slightly smaller than the beam diameter of the signal light. The incident angles of the pump light and the signal light and the placement state of the first P-polarization parametric amplification nonlinear crystal 9 satisfy a non-collinear matching condition, under which the signal light in the P-polarization direction in the signal light is amplified in the first stage, while the signal light in the S-polarization direction remains unchanged (does not satisfy the matching condition).
The amplified signal light is reflected to a first signal light reflecting mirror 11 through a second beam splitting reflecting mirror 10, reaches a third beam splitting reflecting mirror 14 after being reflected by the first beam splitting reflecting mirror, and is injected into a second p-polarization parameter amplification nonlinear crystal 15 after being reflected; the surplus of the pump light and the idle light output by the same path reach a third pump light reflecting mirror 12, the idle light enters a light collector 13, the pump light is reflected and then is injected into a crystal 15 through a third light splitting reflecting mirror 14, the incidence angle of the pump light and the signal light in the crystal and the placement state of a second P-polarization parametric amplification nonlinear crystal 15 meet the non-collinear matching condition, under the condition, the P-polarization direction signal light in the signal light is further amplified to a stable region, and the S-polarization direction signal light is still unchanged (does not meet the matching condition); the signal light with the p-polarization direction amplified enters the subsequent S-polarization parametric amplification module through the fourth light splitting mirror 16. The free light portion and the remaining pump light enter the light collector 17.
The signal light amplified in the P polarization direction is reflected by the second signal light reflector 18 to reach the fifth light reflector 19, and is injected into the first S-polarization parameter amplification nonlinear crystal 20 after being reflected by the second signal light reflector 18, meanwhile, the pump light (P polarization) of the path is injected into the first S-polarization parameter amplification nonlinear crystal 20 after being transmitted by the fifth light reflector 19, the incident angle of the pump light and the signal light in the crystal and the placement state of the first S-polarization parameter amplification nonlinear crystal 20 meet the non-collinear matching condition, under the condition, the signal light in the S polarization direction in the signal light is amplified, and the light energy of the signal light in the P polarization direction is kept unchanged (not meet the matching condition); the signal light amplified in the S polarization direction is reflected by the sixth beam splitter 22 to reach the third signal splitter 23, reflected by the sixth beam splitter 26 and then enters the second S polarization parametric amplification nonlinear crystal 27, the idle light enters the optical collector 25, and the remaining part of the pump light is reflected by the fourth pump beam splitter 24 and then injected into the crystal 27 through the seventh beam splitter 26, wherein the incident angle of the signal light and the pump light in the crystal and the placement state of the crystal satisfy a non-collinear matching condition. The idle light part and the residual pump light generated in the amplification process enter the light collector 29, the S polarization direction in the signal light is amplified in the crystal and then is reflected by the eighth light reflecting mirror 28 and the fourth signal light reflecting mirror 30 and then is output, and because the signal light P and the S component signal are amplified in the front and the rear two amplification modules respectively, the polarization signal after vector superposition is obtained behind the fourth signal light reflecting mirror 30; the final polarization state can be changed by controlling the respective light intensities of the two paths and adjusting the polarization unit 7, and the amplified signal light in any polarization state is finally obtained.
The two paths of pump light are linearly polarized light, and the polarization directions of the pump light are mutually vertical (p and s). The time jitter between the light sources is small (zero synchronous jitter is good), the relative time difference can be adjusted, except the polarization direction, other indexes such as output light intensity, light beam caliber, pulse broadband and the like are kept consistent, and corresponding pump light is respectively provided for an s-parameter amplification module and a p-parameter amplification module of a signal light path. The positions of nonlinear crystals used in the p-polarization signal optical parametric amplification module and the s-polarization signal optical parametric amplification module are mutually vertical (along the transmission direction of light beams), and the lengths of the crystals are consistent with cutting parameters. In the signal light p-polarization amplification module, the pump light is s-polarized light, and the included angle between the signal light and the pump light in the parametric amplification crystal and the crystal placement state meet the non-collinear I-class phase matching condition; in the signal light s-polarization amplification module, the pump light is p-polarized light, the included angle between the signal light and the pump light in the parametric amplification crystal and the crystal placement state still meet the non-collinear I-class phase matching condition, and the spatial positions of the crystals in the two modules are vertical (along the light direction). When the signal light with any polarization direction enters the parametric amplification light path unit, the P polarization direction and the S polarization direction of the signal light are respectively amplified, and finally the output amplified light signals are vector synthesis in two mutually perpendicular directions. The final output polarization state can be adjusted and controlled by changing the pumping light intensity of the two parametric amplification modules and adding a polarization adjusting device 7 in the modes of glass slide, optical rotation and the like before being injected into the amplification unit. The pump light intensity of the parametric amplification module and the polarization adjusting devices 7 such as a glass slide, an optical rotation sheet, a Faraday device, a special polarization device and the like are added before the pump light intensity is injected into the amplification unit for adjusting and controlling. The length and number of the crystals depend on the light intensity of the injected signal light and the light intensity of the pump light, and the specific design parameters need to be based on specific use parameters, such as stronger incident signal light or low requirement on the amplification factor of the signal light, or only the first p-polarization parametric amplification nonlinear crystal 9 and the first s-polarization parametric amplification nonlinear crystal 20 can be used for amplifying the two crystals. The crystal may be a conventional uniaxial or biaxial parametric amplification crystal such as BBO, LBO, YCOB, DKDP, KDP, KTP, etc.
Experiments show that the invention can solve the problem of amplifying broadband signal light in any polarization state by using a parametric amplification principle, and can carry out optical parametric amplification on incident signal light in any polarization. The amplification factor of P or S polarization can be adjusted by controlling the initial polarization state of the input signal light, and a compensation component is added to quantitatively control the polarization state of the output light beam. The device can be widely applied to an ultrashort pulse laser system, and is particularly suitable for the condition of large-caliber large-energy output under the condition that specific polarized light needs to be amplified.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (13)
1. A parametric amplification device for signal light of an arbitrary polarization state, characterized in that: the device comprises a pumping light source module, a horizontal polarization parametric amplification module (P) and a vertical polarization parametric amplification module (S);
the pump light source module outputs two paths of pump light with mutually vertical polarization directions as two paths of incident light, wherein S polarized pump light is incident to the horizontal polarization parametric amplification module (P), and P polarized pump light is incident to the vertical polarization parametric amplification module (S);
the signal light in any polarization state is incident to the horizontal polarization parametric amplification module (P), the synchronization and coincidence of the S polarization pump light and the signal light in time and space are kept, and the incident angle of the S polarization pump light and the signal light and the placement state of the horizontal polarization parametric amplification module (P) meet the non-collinear matching condition, so that the signal light in the P polarization direction in the signal light is amplified, and the signal light in the S polarization direction is kept unchanged; the signal light amplified in the P polarization direction is incident to the vertical polarization parametric amplification module (S), the synchronization and coincidence of the time and the space of the P polarization pump light and the signal light are kept, and the incidence angle of the P polarization pump light and the signal light and the placement state of the vertical polarization parametric amplification module (S) meet the non-collinear matching condition, so that the signal light in the S polarization direction in the signal light is amplified, and the signal light energy in the P polarization direction is kept unchanged;
and the output polarization state is changed by controlling the light intensity of the two paths of pump light, and the amplified signal light in any polarization state is finally obtained.
2. A parametric amplification device for signal light of an arbitrary polarization state as defined in claim 1, wherein: the light intensity, the beam caliber and the pulse broadband of the P polarized pump light and the S polarized pump light are consistent.
3. A parametric amplification device for signal light of an arbitrary polarization state as defined in claim 1 or 2, wherein: the time difference between the two paths of pump light and between the pump light and the signal light pulse can be adjusted.
4. A parametric amplification device for signal light of an arbitrary polarization state as defined in claim 3, wherein: the pulse width of the S polarized pump light is smaller than that of the signal light, the beam aperture of the S polarized pump light is smaller than that of the signal light, the pulse width of the P polarized pump light is smaller than that of the signal light, and the beam aperture of the P polarized pump light is smaller than that of the signal light.
5. A parametric amplification device for signal light of arbitrary polarization state as in any one of claims 1, 2 or 4, wherein: the pumping light source module comprises a first half-wave plate (1), a second half-slide (4), a first beam reducing device (2), a second beam reducing device (5), a first pumping light reflecting mirror (3) and a second pumping light reflecting mirror (6) to form two paths of light paths comprising the first half-wave plate (1), the first beam reducing device (2), the first pumping light reflecting mirror (3) and the second half-slide (4), the second beam reducing device (5) and the second pumping light reflecting mirror (6); two paths of linearly polarized pumping light are respectively adjusted by a first half-wave plate (1) and a second half-slide (4) in respective light paths, so that the polarization directions of the two paths of pumping light are mutually vertical, one path of pumping light is P polarized light, the other path of pumping light is S polarized light, the pumping light is obtained by a first beam reducing device (2) and a second beam reducing device (5) of the respective light paths, and the pumping light is respectively led into a horizontal polarization parameter amplification module (P) and a vertical polarization parameter amplification module (S) by a first pumping light reflector (3) and a second pumping light reflector (6) of the respective light paths.
6. A parametric amplification device for signal light of arbitrary polarization state as defined in claim 5, wherein the first half-wave plate (1) and the second half-wave plate (4) are both narrow-band pump light half-wave plates.
7. The parametric amplification device for signal light with any polarization state according to any one of claims 1, 2 or 4, wherein the horizontal polarization parametric amplification module (P) comprises a first beam splitting mirror (8), a first P-polarization parametric amplification nonlinear crystal (9), a second beam splitting mirror (10), a first signal light mirror (11), a third pumping light mirror (12), a third beam splitting mirror (14), a second P-polarization parametric amplification nonlinear crystal (15), a fourth beam splitting mirror (16) and a second signal light mirror (18); the vertical polarization parametric amplification module (S) comprises a fifth light splitting reflector (19), a first S-polarization parametric amplification nonlinear crystal (20), a sixth light splitting reflector (22), a third signal light reflector (23), a fourth pump light reflector (24), a seventh light splitting reflector (26), a second S-polarization parametric amplification nonlinear crystal (27), an eighth light splitting reflector (28) and a fourth signal light reflector (30);
signal light in any polarization state is reflected by the first light splitting reflector (8) and then injected into the first P-polarization parametric amplification nonlinear crystal (9), meanwhile, S-polarization pump light is transmitted by the first light splitting reflector (8) and then injected into the first P-polarization parametric amplification nonlinear crystal (9), the signal light and the S-polarization pump light keep time synchronization and coincidence with space, and the incident angle of the signal light and the S-polarization pump light and the placement state of the first P-polarization parametric amplification nonlinear crystal (9) meet the conditions of non-collinear matching, so that the signal light in the P polarization direction in the signal light is amplified for the first stage, and the signal light in the S polarization direction keeps unchanged; the amplified signal light is reflected by the second beam splitting reflector (10), the first signal light reflector (11) and the third beam splitting reflector (14) in sequence and then injected into a second p-polarization parametric amplification nonlinear crystal (15); the pump light allowance and idle light which are output in the same path reach a third pump light reflecting mirror (12) after being transmitted by the second beam splitting reflecting mirror (10), the pump light is reflected by the third pump light reflecting mirror (12), then is transmitted by the third beam splitting reflecting mirror (14), and is also injected into a second P-polarization parametric amplification nonlinear crystal (15), and the incident angle of the signal light and the pump light and the placement state of the second P-polarization parametric amplification nonlinear crystal (15) meet the matching condition of non-collinearity and the like, so that the signal light in the P polarization direction in the signal light is further amplified to a stable region, and the signal light in the S polarization direction is still unchanged; the further amplified signal light obtained in the P polarization direction is reflected by a fourth light reflecting mirror (16), a second signal light reflecting mirror (18) and a fifth light reflecting mirror (19) in sequence and then injected into a first S polarization parameter amplification nonlinear crystal (20), meanwhile, the P polarization pump light is transmitted by the fifth light reflecting mirror (19) and then injected into the first S polarization parameter amplification nonlinear crystal (20), in the first S polarization parameter amplification nonlinear crystal (20), the incident angle of the pump light and the signal light and the placement state of the first S polarization parameter amplification nonlinear crystal (20) meet the non-collinear matching condition, so that the signal light in the S polarization direction in the signal light is amplified, and the light energy of the P polarization direction signal is kept unchanged; the signal light amplified in the S polarization direction sequentially passes through the sixth light splitting reflector (22), the third signal light reflector (23) and the seventh light splitting reflector (26) to be reflected and then enters the second S-polarization parametric amplification nonlinear crystal (27), meanwhile, the pump light allowance is transmitted by the sixth light splitting reflector (22), then is reflected by the fourth pump light reflector (24), is transmitted by the seventh light splitting reflector (26), and then is injected into the second S-polarization parametric amplification nonlinear crystal (27), and the signal light in the second S-polarization parametric amplification nonlinear crystal (27), the incident angle of the pump light and the crystal placement state meet the non-collinear matching condition, so that after the S polarization direction in the signal light is amplified, the signal light is reflected by the eighth light splitting reflector (28) and the fourth signal light reflector (30) to output the polarization signal light after vector superposition.
8. The parametric amplification device for signal light of any polarization state according to claim 7, wherein a placement orientation of the nonlinear crystal in the horizontally polarized signal light parametric amplification module and a placement orientation of the nonlinear crystal used in the vertically polarized signal light parametric amplification module are perpendicular to each other in a light beam transmission direction, cutting parameters of the first p-polarization parametric amplification nonlinear crystal (9) and the second p-polarization parametric amplification nonlinear crystal (15) are kept consistent, and cutting parameters of the first s-polarization parametric amplification nonlinear crystal (20) and the second s-polarization parametric amplification nonlinear crystal (27) are kept consistent.
9. The parametric amplification device for signal light of an arbitrary polarization state according to claim 7, wherein lengths and numbers of the first p-polarization parametric amplification nonlinear crystal (9), the second p-polarization parametric amplification nonlinear crystal (15), the first s-polarization parametric amplification nonlinear crystal (20), and the second s-polarization parametric amplification nonlinear crystal (27) depend on an intensity of the injected signal light and an intensity of the pump light.
10. The parametric amplification device for signal light of an arbitrary polarization state according to claim 7, wherein the first p-polarization parametric amplification nonlinear crystal (9), the second p-polarization parametric amplification nonlinear crystal (15), the first s-polarization parametric amplification nonlinear crystal (20), and the second s-polarization parametric amplification nonlinear crystal (27) are uniaxial or biaxial parametric amplification crystals including BBO, LBO, YCOB, DKDP, KDP, or KTP.
11. The parametric amplification device for signal light with arbitrary polarization state of claim 7, further comprising a polarization adjusting unit (7), wherein the signal light with arbitrary polarization state is incident to the first beam splitting mirror (8) after the polarization state of the signal light with arbitrary polarization state is adjusted by the polarization adjusting unit.
12. The parametric amplification device of signal light with arbitrary polarization state of claim 11, wherein the adjusting polarization unit (7) is a glass slide, an optical rotation sheet or a faraday polarization device.
13. The parametric amplification device of signal light with any polarization state of claim 1, 2 or 4, wherein the output polarization state is changed by controlling the light intensity of the two pumping lights, so as to finally obtain the amplified signal light with any polarization state.
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| JPH07170003A (en) * | 1993-12-15 | 1995-07-04 | Mitsubishi Heavy Ind Ltd | Laser oscillation equipment capable of changing wavelength |
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| CN108565670A (en) * | 2018-04-08 | 2018-09-21 | 上海理工大学 | Frequency spectrum High-resolution coherent anti-Stokes Raman scatters light source implementation method |
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| US6150630A (en) * | 1996-01-11 | 2000-11-21 | The Regents Of The University Of California | Laser machining of explosives |
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| JPH07170003A (en) * | 1993-12-15 | 1995-07-04 | Mitsubishi Heavy Ind Ltd | Laser oscillation equipment capable of changing wavelength |
| JP2001024264A (en) * | 1999-07-05 | 2001-01-26 | Toshiba Corp | Wavelength converting laser device |
| CN103311791A (en) * | 2013-05-15 | 2013-09-18 | 中国科学院上海光学精密机械研究所 | Femtosecond optical parameter amplifier |
| CN105048265A (en) * | 2015-08-24 | 2015-11-11 | 哈尔滨工业大学 | High-power long-wave infrared 8 micron-12 micron laser device based on polarization beam combination technology |
| CN108565670A (en) * | 2018-04-08 | 2018-09-21 | 上海理工大学 | Frequency spectrum High-resolution coherent anti-Stokes Raman scatters light source implementation method |
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