CN111948871B - Multi-pass amplification system shared by pump light and signal light - Google Patents
Multi-pass amplification system shared by pump light and signal light Download PDFInfo
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- CN111948871B CN111948871B CN202010829468.7A CN202010829468A CN111948871B CN 111948871 B CN111948871 B CN 111948871B CN 202010829468 A CN202010829468 A CN 202010829468A CN 111948871 B CN111948871 B CN 111948871B
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- 230000003321 amplification Effects 0.000 title claims abstract description 128
- 238000003199 nucleic acid amplification method Methods 0.000 title claims abstract description 128
- 230000003287 optical effect Effects 0.000 claims abstract description 16
- 238000005086 pumping Methods 0.000 claims abstract description 4
- 239000013078 crystal Substances 0.000 claims description 26
- 239000011148 porous material Substances 0.000 claims description 12
- 230000005540 biological transmission Effects 0.000 claims description 8
- 238000003384 imaging method Methods 0.000 claims description 3
- 229910052779 Neodymium Inorganic materials 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000000750 progressive effect Effects 0.000 description 2
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- G—PHYSICS
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/39—Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves
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Abstract
The invention relates to a multi-pass amplification system for sharing pump light and signal light, belonging to the technical field of high-power laser systems, wherein a small-energy laser pulse is injected into the multi-pass amplification system and is subjected to double-pass amplification by an inverter, the laser pulse after double-pass amplification is led out of the multi-pass amplification system by a first reflection element, the laser pulse is used as pump light of an OPA (optical amplifier) amplification stage of the signal light after frequency multiplication, the pump light is used for pumping the signal light to complete OPA (optical amplifier) amplification of the signal light, the amplified signal light is injected into the multi-pass amplification system to carry out CPA (cross talk) amplification, the pump light and the signal light share the multi-pass amplification system, before the large-energy signal light is injected and most of energy of the amplification system is extracted, the small-energy laser pulse is amplified by the first two-pass amplification and is used as large-energy pump light of the OPA amplification stage of the signal light, the signal light realizes kilojoule level energy output by the rear-stage single-pass amplification of the amplification system, the signal-to-noise ratio of the signal light is improved, the energy utilization rate can be effectively improved, and the cost performance of the multi-pass amplification system is improved.
Description
Technical Field
The invention belongs to the technical field of high-power laser systems, and particularly relates to a multi-pass amplification system shared by pump light and signal light.
Background
High power laser drivers are capable of providing laser pulses of megajoule-level energy. At present, the high-power laser driver adopts neodymium glass as a gain medium, adopts a multi-pass amplification configuration, consists of multiple paths of same lasers and the like. The multi-pass amplification system is a main part of the laser driver and provides main energy amplification of kilojoule to kilojoule level, wherein the first-pass amplification amplifies the front-stage input laser by a higher gain factor, and the back-pass amplification extracts most energy to realize high-energy output.
For kilojoule chirped pulse output, if a multi-pass amplification configuration is used, the signal-to-noise ratio is reduced due to leakage of the multi-pass pinhole, and the multi-pass amplification configuration is not suitable for obtaining a higher signal-to-noise ratio. Therefore, single pass progressive amplification (i.e., conventional MOPA amplification) is required to amplify the signal light energy to a certain scale. However, the gain medium used for single-pass progressive amplification is large in number and low in energy utilization.
Disclosure of Invention
In order to solve the above problems, a multi-pass amplification system for both pump light and signal light is proposed, in which the signal light is amplified by a single pass at a rear stage of the multi-pass amplification to achieve kilojoule level output and improve the signal-to-noise ratio, and the pump light is amplified by a multi-pass at a front stage of the multi-pass amplification to fully utilize the energy of the amplification system, thereby improving the signal-to-noise ratio, effectively improving the energy utilization ratio, and improving the cost performance of the multi-pass amplification system.
In order to achieve the purpose, the invention provides the following technical scheme:
a pump light and signal light shared multi-pass amplification system is internally provided with an inverter, small-energy laser pulses are injected into the multi-pass amplification system and subjected to double-pass amplification by the inverter, the laser pulses subjected to double-pass amplification are led out of the multi-pass amplification system by a first reflection element, and are used as large-energy pump light of a signal light parametric pulse amplification stage after frequency multiplication;
the pumping light completes optical parametric pulse amplification of the signal light to the signal light pump, and the amplified signal light is injected into the multi-pass amplification system for pulse amplification, so that kilojoule level pulse light output is realized.
Further, the device comprises a first-stage spatial filter, an amplifying medium and a second-stage spatial filter, wherein the first-stage spatial filter comprises a first lens, a first small pore plate and a second lens, the second-stage spatial filter comprises a third lens, a second small pore plate and a fourth lens, and the inverter is located at the second small pore plate.
Further, the low-energy laser pulse is injected from the first small hole plate, is subjected to one-pass amplification through the amplification medium and is transmitted to the second small hole plate, the laser pulse subjected to one-pass amplification is transmitted to the inverter through the second reflection element, is transmitted to the second small hole plate and the amplification medium again after passing through the inverter, double-pass amplification is completed, and the multi-pass amplification system is led out through the first-stage spatial filter and the first reflection element.
Further, the first small hole plate and the second small hole plate have the same structure, and the small holes in the first small hole plate and the small holes in the second small hole plate meet the conjugate imaging relationship.
Furthermore, a center hole located at the center of the first small hole plate and off-axis holes located at the periphery of the first small hole plate are formed in the first small hole plate, the signal light is transmitted through the center hole, and the small-energy laser pulses are transmitted through the off-axis holes.
Furthermore, the second reflecting element is positioned at the off-axis hole of the second small hole plate so as to change the transmission direction of the small-energy laser pulse and realize the transmission of the small-energy laser pulse between the second-stage spatial filter and the inverter.
Further, a single frequency doubling crystal or a plurality of cascaded frequency doubling crystals are adopted to carry out frequency doubling on the laser pulse output by double-pass amplification to be used as the high-energy pump light of the signal light parametric pulse amplification stage.
Further, the pump light and the signal light are incident to a nonlinear crystal at a small angle phase matching angle for optical parametric pulse amplification, wherein the nonlinear crystal is a BBO crystal, an LBO crystal or a KDP crystal.
Further, the signal light amplified by the optical parametric pulse is injected from the first orifice plate, is amplified in a single pass by the amplifying medium and is transmitted to the second-stage spatial filter, and the kilojoule-level pulse light is output by the fourth lens.
The invention has the beneficial effects that:
before high-energy signal light is injected and most energy of the amplification system is extracted to realize kilojoule level pulse light output, the first two-pass amplification of the multi-pass amplification is utilized to amplify the small-energy laser pulse by higher times and serve as the high-energy pump light of the signal light parameter pulse amplification level, the signal light utilizes the back-stage one-pass amplification of the amplification system to realize the kilojoule level energy output, the design defect that the signal-to-noise ratio is reduced due to the fact that the signal light is amplified in multiple passes and leaked from multiple passes through holes is avoided, the signal-to-noise ratio of the signal light is improved, the energy utilization rate is effectively improved, and the cost performance of the multi-pass amplification system is improved.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2(a) is a schematic structural view of a first orifice plate;
fig. 2(b) is a schematic structural view of the second orifice plate.
In the drawings: 1-a first lens, 2-a first aperture plate, 3-a second lens, 4-neodymium glass amplification medium, 5-a third lens, 6-a second aperture plate, 7-a fourth lens, 8-an inverter, 9-small energy laser pulse, 10-signal light, 11-a first reflecting element, 12-frequency doubling crystal, 13-a third reflecting element and 14-nonlinear crystal;
the solid line represents a transmission optical path of the pump light, and the dotted line represents a transmission optical path of the signal light;
PA1-1, PA1-2 and PA1-3 represent orifices of the first orifice plate, and PA2-1, PA2-2 and PA2-3 represent orifices of the second orifice plate.
Detailed Description
In order to make the technical solutions of the present invention better understood, the following description of the technical solutions of the present invention with reference to the accompanying drawings of the present invention is made clearly and completely, and other similar embodiments obtained by a person of ordinary skill in the art without any creative effort based on the embodiments in the present application shall fall within the protection scope of the present application. In addition, directional terms such as "upper", "lower", "left", "right", etc. in the following embodiments are directions with reference to the drawings only, and thus, the directional terms are used for illustrating the present invention and not for limiting the present invention.
The first embodiment is as follows:
a pump light and signal light shared multi-pass amplification system is characterized in that an inverter is arranged in the multi-pass amplification system, small-energy laser pulses are injected into the multi-pass amplification system and subjected to double-pass amplification by the inverter, the laser pulses subjected to double-pass amplification are led out of the multi-pass amplification system by a first reflection element, and are used as large-energy pump light of a signal light parametric pulse amplification stage after frequency multiplication; the pumping light completes optical parametric pulse amplification of the signal light to the signal light pump, the amplified signal light is injected into the multi-pass amplification system for pulse amplification, and kilojoule level pulse light is output.
The inventor designs by optimizing the light path, make pump light and signal light share the multipass amplification system, before the high-energy signal light is injected and extracted and most energy of the amplification system realizes kilojoule level pulse light output, utilize the first two-pass amplification of multipass amplification to amplify the higher multiple of the low-energy laser pulse and regard as the high-energy pump light of signal light parameter pulse amplification level, the signal light utilizes the back-end single-pass amplification of the amplification system to realize kilojoule level energy output, the design defect that the signal light leaks and causes the signal-to-noise ratio to reduce by the multipass aperture because of multipass amplification is avoided, has both improved the signal-to-noise ratio of the signal light, can effectively improve the energy utilization ratio, has improved the cost performance of the multipass amplification system.
Specifically, the amplifying system further comprises a first-stage spatial filter, an amplifying medium and a second-stage spatial filter, the first-stage spatial filter comprises a first lens, a first small pore plate and a second lens, the second-stage spatial filter comprises a third lens, a second small pore plate and a fourth lens, and the inverter is located at the second small pore plate. The first small hole plate and the second small hole plate have the same structure, and the small holes in the first small hole plate and the small holes in the second small hole plate meet the conjugate imaging relationship. Specifically, the first small hole plate is provided with a center hole located at the center of the first small hole plate and off-axis holes located at the periphery of the first small hole plate, the signal light is transmitted through the center hole, the low-energy laser pulse is transmitted through the off-axis holes, and meanwhile, the off-axis holes of the second small hole plate are provided with second reflecting elements so as to change the transmission direction of the low-energy laser pulse and realize the transmission of the low-energy laser pulse between the second-stage spatial filter and the reverser.
The small-energy laser pulse is injected from the first small hole plate, is subjected to one-pass amplification through the amplification medium and is transmitted to the second small hole plate, the second reflection element reflects the laser pulse subjected to one-pass amplification to the inverter, the structure of the inverter can refer to the structure disclosed by CN201410464536.9, the inverter transmits the laser pulse to the second small hole plate and the amplification medium again, the laser pulse is subjected to two-pass amplification, the laser pulse is guided out of the multi-pass amplification system through the first reflection element after passing through the first-stage spatial filter, and then the laser pulse output by the two-pass amplification is subjected to frequency multiplication through a single frequency multiplication crystal or a plurality of cascade frequency multiplication crystals to be used as large-energy pump light of the signal light parametric pulse amplification stage.
And the pump light and the signal light are incident to a nonlinear crystal at a small angle phase matching angle to perform optical parametric pulse amplification, wherein the nonlinear crystal is a BBO crystal (small caliber), an LBO crystal (medium caliber) or a KDP crystal (large caliber). The signal light amplified by the optical parametric pulse is injected from the first small pore plate, is amplified in a single pass through the amplifying medium, is transmitted to the second small pore plate of the second-stage spatial filter, and outputs kilojoule-level pulse light through the fourth lens.
Example two:
the structure of the multi-pass amplifying system is shown in fig. 1 and fig. 2, and the same parts in this embodiment as those in the first embodiment are not described again, except that:
the amplifying medium 4 is neodymium glass amplifying medium, the frequency doubling crystal 12 is KDP crystal, and the nonlinear crystal 14 is LBO crystal.
The magnifying system comprises a first stage spatial filter comprising a first lens 1, a first aperture plate (PA1)2 and a second lens 3, a magnifying medium 4, a second stage spatial filter comprising a third lens 5, a second aperture plate (PA2)6 and a fourth lens 7, and an inverter 8.
Specifically, a small-energy laser pulse 9 is injected from a first off-axis hole (PA1-1) of the first small hole plate 2, is amplified for one stroke by the amplifying medium 4 and is transmitted to a second off-axis hole (PA2-2) of the second small hole plate 6, the laser pulse amplified in one pass is transmitted to the inverter 8 through the second reflecting element, the laser pulse passing through the inverter 8 is transmitted to the off-axis hole I (PA2-1) of the second small hole plate 6 and the amplifying medium 4 again for double-pass amplification, and the multi-pass amplification system is led out by the first reflection element 11 after passing through an off-axis hole II (PA1-2) of the first small hole plate 2 and the first lens 1, frequency is multiplied by the frequency doubling crystal 12 and injected into the nonlinear crystal 14 through the third reflecting element 13 to be used as large-energy pump light of the signal light parametric pulse amplification stage, among them, the first, second, and third reflective elements 11, 13 are preferably mirrors.
The pump light and the signal light 10 are incident to the nonlinear crystal 14 at a small angle phase matching angle to perform optical parametric pulse amplification, the signal light amplified by the optical parametric pulse is injected from a central hole (PA1-3) of the first small pore plate 2, is amplified in a single pass through the amplification medium 4 and is transmitted to a central hole (PA2-3) of the second small pore plate 6, and is output through the fourth lens 7, so that the signal light with high energy, high signal-to-noise ratio and high beam quality is obtained.
In summary, in this embodiment, a set of optical parametric pulse amplification stage and a set of pulse amplification stage of "neodymium glass amplification medium + two-stage spatial filter" are adopted, so that energy amplification of pump light in a multi-pass amplification system can be realized while high energy, high signal-to-noise ratio and high beam quality kilojoule level pulse light output are ensured, and energy of the multi-pass amplification system is effectively utilized, thereby greatly improving cost performance of the amplification system, and providing a new preferred scheme for construction of a future laser driver.
The present invention has been described in detail, and it should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Claims (8)
1. A multi-pass amplification system shared by pump light and signal light is characterized by comprising a first-stage spatial filter, an amplification medium and a second-stage spatial filter, wherein the first-stage spatial filter comprises a first lens, a first small pore plate and a second lens, and the second-stage spatial filter comprises a third lens, a second small pore plate and a fourth lens;
the second small hole plate is provided with an inverter, small-energy laser pulses are injected into the multi-pass amplification system and are subjected to double-pass amplification through the inverter, the laser pulses subjected to double-pass amplification are guided out of the multi-pass amplification system through the first reflection element, and the laser pulses subjected to double-pass amplification are used as large-energy pump light of a signal light parametric pulse amplification level;
the pumping light completes optical parametric pulse amplification of the signal light to the signal light pump, and the amplified signal light is injected into the multi-pass amplification system for pulse amplification, so that kilojoule level pulse light output is realized.
2. The pump light and signal light shared multipass amplification system of claim 1, wherein the low-energy laser pulse is injected from a first small aperture plate, is subjected to one-pass amplification by the amplification medium and is transmitted to a second small aperture plate, the laser pulse subjected to one-pass amplification is transmitted to the inverter by the second reflection element, is transmitted to the second small aperture plate and the amplification medium again after passing through the inverter, is subjected to two-pass amplification, and is led out of the multipass amplification system by the first reflection element through the first stage spatial filter.
3. The pump light and signal light shared multipass amplification system of claim 2, wherein the first aperture plate and the second aperture plate have the same structure, and the apertures in the first aperture plate and the apertures in the second aperture plate satisfy a conjugate imaging relationship.
4. The pump light and signal light shared multipass amplification system of claim 3, wherein the first aperture plate has a central hole at its center and off-axis holes at its periphery, the signal light is transmitted through the central hole, and the low-energy laser pulses are transmitted through the off-axis holes.
5. The pump light and signal light shared multipass amplification system of claim 4, wherein the second reflective element is located at an off-axis aperture of the second aperture plate to change the direction of transmission of the low-energy laser pulses to achieve transmission of the low-energy laser pulses between the second stage spatial filter and the inverter.
6. The pump light and signal light shared multi-pass amplification system of any one of claims 2-5, wherein a single frequency doubling crystal or a cascade of multiple frequency doubling crystals is used to double frequency the laser pulses output by the two-pass amplification as the high-energy pump light of the signal light parametric pulse amplification stage.
7. The pump light and signal light shared multipass amplification system of claim 6, wherein the pump light and the signal light are incident on the nonlinear crystal at a small angle phase matching angle for optical parametric pulse amplification.
8. The pump light and signal light shared multi-pass amplification system of claim 7, wherein the signal light amplified by the optical parametric pulse is injected from the first aperture plate, amplified by the amplification medium in a single pass, transmitted to the second spatial filter, and output as kilojoule level pulse light through the fourth lens.
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