CN111948871A - 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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- CN111948871A CN111948871A CN202010829468.7A CN202010829468A CN111948871A CN 111948871 A CN111948871 A CN 111948871A CN 202010829468 A CN202010829468 A CN 202010829468A CN 111948871 A CN111948871 A CN 111948871A
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- 230000003321 amplification Effects 0.000 title claims abstract description 134
- 238000003199 nucleic acid amplification method Methods 0.000 title claims abstract description 134
- 230000003287 optical effect Effects 0.000 claims abstract description 9
- 238000005086 pumping Methods 0.000 claims abstract description 6
- 239000013078 crystal Substances 0.000 claims description 26
- 230000005540 biological transmission Effects 0.000 claims description 8
- 238000003384 imaging method Methods 0.000 claims description 3
- 239000011148 porous material Substances 0.000 description 8
- 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
- 101100456571 Mus musculus Med12 gene Proteins 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- 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
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, 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 signal light OPA amplification-level large-energy pump light after frequency multiplication;
the pumping light completes OPA amplification of the signal light to the signal light pump, and the amplified signal light is injected into the multi-pass amplification system for CPA amplification, so that kilojoule level chirped 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 cascade of multiple frequency doubling crystals is adopted to double frequency the laser pulse output by the double-pass amplification, and the double frequency laser pulse is used as the high-energy pump light of the signal light OPA amplification stage.
Further, the pump light and the signal light are incident to a nonlinear crystal at a small angle phase matching angle for OPA amplification, and the nonlinear crystal is a BBO crystal, an LBO crystal or a KDP crystal.
Further, the signal light amplified by the OPA is injected from the first orifice plate, is amplified in a single pass by the amplifying medium, is transmitted to the second-stage spatial filter, and is output as kilojoule-level chirped pulse light through 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 output of kilojoule-level chirped pulse light, the high-energy laser pulse is amplified by a high multiple through the first two-pass amplification of the multi-pass amplification and serves as the high-energy pump light of an OPA (optical phase amplifier) amplification level of the signal light, the rear-stage one-pass amplification of the amplification system is utilized to realize output of the kilojoule-level energy of the signal light, the design defect that the signal-to-noise ratio is reduced due to multi-pass small hole leakage caused by multi-pass amplification of the signal light is overcome, 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;
PA 1-1, PA 1-2 and PA 1-3 represent orifices of the first orifice plate, and PA 2-1, PA 2-2 and PA 2-3 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 multi-pass amplification system for both pump light and signal light, the signal light including a first optical parametric pulse amplification stage (OPA amplification stage) and a first chirped pulse amplification stage (CPA amplification stage).
Specifically, 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 through the inverter, the laser pulses subjected to double-pass amplification are guided out of the multi-pass amplification system through a first reflection element, and the laser pulses subjected to double-pass amplification are used as high-energy pump light of an OPA (optical phase amplification) amplification level of signal light after frequency multiplication; the pumping light completes OPA amplification of the signal light to the signal light pump, the amplified signal light is injected into the multi-pass amplification system for CPA amplification, and kilojoule level chirp pulse light is output.
The inventor makes pumping light and signal light share a multi-pass amplification system by optimizing light path design, before high-energy signal light is injected and most energy of the amplification system is extracted to realize kilojoule level chirped pulse light output, the high-energy laser pulse is amplified by a high multiple by utilizing the first two-pass amplification of the multi-pass amplification and is used as the high-energy pumping light of an OPA (optical amplifier) amplification level of the signal light, the kilojoule level energy output is realized by utilizing the back-stage one-pass amplification of the amplification system of the signal light, the design defect that the signal-to-noise ratio is reduced due to multi-pass small hole leakage caused by the multi-pass amplification of the signal light is avoided, the signal-to-noise ratio of the signal light is improved, the energy utilization rate is effectively improved, and the cost.
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 OPA amplification stage.
And (3) the pump light and the signal light are incident to a nonlinear crystal at a small angle phase matching angle for OPA 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 OPA is injected from the first small hole plate, is amplified in a single pass through the amplifying medium, is transmitted to the second small hole plate of the second-stage spatial filter, and outputs kilojoule-level chirped 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 (PA 1-1) 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 (PA 2-2) 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 (PA 2-1) 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 (PA 1-2) 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 OPA 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 for OPA amplification, the signal light amplified by the OPA is injected from a central hole (PA 1-3) of the first small pore plate 2, is amplified in a single pass by the amplification medium 4 and is transmitted to a central hole (PA 2-3) of the second small pore plate 6, and is output by 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 OPA amplification stages and a set of CPA amplification stages of "neodymium glass amplification medium + two-stage spatial filter" are adopted, so that while ensuring high energy, high signal-to-noise ratio and high beam quality kilojoule level chirped pulse light output, energy amplification of pump light in a multi-pass amplification system can be realized, 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 (9)
1. A multi-pass amplification system shared by pump light and signal light 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 an OPA (optical phase amplification) amplification level of the signal light after frequency multiplication;
the pumping light completes OPA amplification of the signal light to the signal light pump, and the amplified signal light is injected into the multi-pass amplification system for CPA amplification, so that kilojoule level chirped pulse light output is realized.
2. The pump light and signal light shared multipass amplification system of claim 1, comprising a first stage spatial filter comprising a first lens, a first aperture plate and a second lens, an amplification medium, and a second stage spatial filter comprising a third lens, a second aperture plate and a fourth lens, the inverter being located at the second aperture plate.
3. The pump light and signal light shared multipass amplification system of claim 2, 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.
4. The pump light and signal light shared multipass amplification system of claim 3, 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.
5. The pump light and signal light shared multipass amplification system of claim 4, 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.
6. The pump light and signal light shared multipass amplification system of claim 5, 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.
7. The multi-pass amplification system for both pump light and signal light as claimed in any one of claims 3-6, wherein a single frequency doubling crystal or a cascade of multiple frequency doubling crystals is used to double the frequency of the laser pulses output by the two-pass amplification as the high-energy pump light for the OPA amplification stage of the signal light.
8. The multi-pass amplification system of claim 7, wherein the pump light and the signal light are incident on the nonlinear crystal at a small phase matching angle for OPA amplification.
9. The multi-pass amplification system for both pump light and signal light according to claim 8, wherein the signal light amplified by OPA is injected from the first aperture plate, amplified by a single pass through the amplification medium, transmitted to the second spatial filter, and output as kilojoule chirped pulse light through the fourth lens.
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