Active cooling pulse optical fiber amplifier and control method thereof
Active cooling is achieved by using anti-Stokes pumps and Stokes pumps in active cooling pulse fiber amplifiers, which solves the problems of poor heat release effect and mode distortion, and improves the efficiency and reliability of the amplifier.
Patent Information
- Application Number
- CN202510431898.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-08
- Publication Date
- 2025-07-04
AI Technical Summary
The existing high-power pulse active cooling fiber amplifiers have problems with poor heat release effect, intensity and frequency noise and mode distortion during the amplification process, especially due to external passive heat dissipation methods.
Anti-Stokes pumps and Stokes pumps are used to emit light pulses of different energy at preset frequency. When the signal light pulse is amplified by the gain fiber, the quantum loss is used to generate waste heat and actively cool through phonon transmission to avoid external heat dissipation.
Improves heat release effect, reduces mode distortion and frequency noise, simplifies heat dissipation requirements, and enhances the reliability and efficiency of the amplifier.
Smart Images
Figure CN120262143A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of laser technology, and particularly to an actively cooled pulsed fiber amplifier and its control method. Background Art
[0002] The pulsed actively cooled pulsed fiber amplifier has the advantages of good beam quality, high efficiency, compact structure, high reliability, easy maintenance, etc., and has received extensive attention. Currently, it is widely used in fields such as marking, cleaning, and cutting. High-power pulsed actively cooled pulsed fiber amplifiers mostly use a multi-stage amplification method. When the gain fiber of the amplification stage is amplifying, it is inevitable to generate corresponding waste heat. Therefore, currently, external passive methods such as air cooling or water cooling are used to dissipate heat from the gain fiber of the amplification stage, but this will cause certain intensity and frequency noise, and at the same time, when the gain fiber is unevenly heated, it will cause certain mode distortion, resulting in poor heat dissipation effect of the actively cooled pulsed fiber amplifier. Summary of the Invention
[0003] An embodiment of this application provides an actively cooled pulsed fiber amplifier, which can improve the heat dissipation effect of the actively cooled pulsed fiber amplifier.
[0004] In a first aspect, the actively cooled pulsed fiber amplifier provided by this application includes:
[0005] At least one anti-Stokes pump, which is used to emit anti-Stokes optical pulses at a preset frequency, wherein the duration of the anti-Stokes optical pulses is a first duration;
[0006] At least one Stokes pump, which is used to emit Stokes optical pulses at a preset frequency, wherein the duration of the Stokes optical pulses is a second duration;
[0007] A signal source, which is used to emit signal optical pulses at a preset frequency, wherein the duration of the signal optical pulses is a third duration;
[0008] A gain fiber, which is used to receive the signal optical pulses, the anti-Stokes optical pulses, and the Stokes optical pulses and amplify the signal light;
[0009] Wherein, the photon energy of the Stokes optical pulses is greater than the photon energy of the signal optical pulses, and the photon energy of the signal optical pulses is greater than the photon energy of the anti-Stokes optical pulses;
[0010] There is a target anti-Stokes optical pulse and a target Stokes optical pulse between the end times of an adjacent first signal optical pulse and a second signal optical pulse. The start time of the target anti-Stokes optical pulse is earlier than the start time of the target Stokes optical pulse, and the start time of the target Stokes optical pulse is earlier than the start time of the second signal optical pulse.
[0011] Optionally, the wavelength of the anti-Stokes optical pulse is greater than the wavelength of the signal optical pulse, and the wavelength of the signal optical pulse is greater than the wavelength of the Stokes optical pulse.
[0012] Optionally, the active-cooling pulsed fiber amplifier includes a fiber combiner. The input ends of the fiber combiner are respectively connected to the signal source, the anti-Stokes pump, and the Stokes pump, and the output end of the fiber combiner is connected to the gain fiber.
[0013] Optionally, the fiber combiner is a three-in-one fiber combiner, a seven-in-one fiber combiner, or a nineteen-in-one fiber combiner.
[0014] Optionally, the number of the Stokes pumps is at least two, and the number of the anti-Stokes pumps is at least two.
[0015] Optionally, the end time of the target anti-Stokes optical pulse is not earlier than the start time of the target Stokes optical pulse, and the end time of the target Stokes optical pulse is not earlier than the start time of the second signal optical pulse.
[0016] Optionally, the end time of the target anti-Stokes optical pulse is earlier than the start time of the target Stokes optical pulse, and the end time of the target Stokes optical pulse is earlier than the start time of the second signal optical pulse.
[0017] Optionally, the gain fiber is doped with rare earth elements.
[0018] Optionally, the rare earth element is ytterbium or erbium.
[0019] In a second aspect, a control method for the active-cooling pulsed fiber amplifier provided by the present application is applied to a control system of the active-cooling pulsed fiber amplifier. The control system of the active-cooling pulsed fiber amplifier includes a control device and the active-cooling pulsed fiber amplifier according to any one of the first aspect. The control method for the active-cooling pulsed fiber amplifier includes:
[0020] Controlling the anti-Stokes pump to emit anti-Stokes optical pulses at a preset frequency, where the duration of the anti-Stokes optical pulse is a first duration;
[0021] Control the Stokes pump to emit Stokes optical pulses at a preset frequency, where the duration of the Stokes optical pulses is a second duration;
[0022] Control the signal source to emit signal optical pulses at a preset frequency, where the duration of the signal optical pulses is a third duration.
[0023] In this application, compared with the related art, the active cooling pulsed fiber amplifier of this application includes: at least one anti-Stokes pump, which is used to emit anti-Stokes optical pulses at a preset frequency, where the duration of the anti-Stokes optical pulses is the first duration; at least one Stokes pump, which is used to emit Stokes optical pulses at a preset frequency, where the duration of the Stokes optical pulses is the second duration; a signal source, which is used to emit signal optical pulses at a preset frequency, where the duration of the signal optical pulses is the third duration; a gain fiber, which is used to receive the signal optical pulses, anti-Stokes optical pulses, and Stokes optical pulses and amplify the signal optical pulses; where the photon energy of the Stokes optical pulses is greater than the photon energy of the signal optical pulses, and the photon energy of the signal optical pulses is greater than the photon energy of the anti-Stokes optical pulses; there is a target anti-Stokes optical pulse and a target Stokes optical pulse between the end times of adjacent first signal optical pulses and second signal optical pulses, the start time of the target anti-Stokes optical pulse is earlier than the start time of the target Stokes optical pulse, and the start time of the target Stokes optical pulse is earlier than the start time of the second signal optical pulse. In the active cooling pulsed fiber amplifier of this application, the anti-Stokes pump first performs pulsed pumping to generate anti-Stokes optical pulses, and the anti-Stokes optical pulses enter the gain fiber. At this time, the gain fiber absorbs the energy of the anti-Stokes pump, and some ground-state particles absorb the energy of the anti-Stokes pump and transition to the corresponding energy levels; later, the Stokes pump performs pulsed pumping to generate Stokes optical pulses, and the Stokes optical pulses enter the gain fiber. Since the photon energy corresponding to the Stokes pump is greater than the photon energy of the anti-Stokes pump, the Stokes optical pulses will not be amplified. At this time, the gain fiber absorbs the energy of the Stokes pump, and some ground-state particles absorb the energy of the Stokes pump and transition to the corresponding energy levels; finally, the signal optical pulses enter the gain fiber. At this time, since the signal optical photon energy is lower than the photon energy of the Stokes pump but higher than the photon energy of the anti-Stokes pump, the signal optical pulses are amplified by absorbing the energy of the Stokes optical pulses through the gain fiber. Due to quantum deficit, some waste heat is generated, and its energy is transmitted through phonons. At this time, the upper-level particles generated by the anti-Stokes pump in the gain fiber before absorb the phonon energy, absorb the waste heat, and release photons with a wavelength lower than that of the anti-Stokes optical pulses, completing the active cooling of the signal optical amplification process. When the amplifier performs signal optical amplification, there is no need to use air cooling or water cooling to dissipate heat from the gain fiber, solving the problems of intensity and frequency noise, and reducing the occurrence of mode distortion, and can improve the heat dissipation effect of the active cooling pulsed fiber amplifier. Description of the Drawings
[0024] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.
[0025] Figure 1 It is a schematic structural diagram of an embodiment of an actively cooled pulsed fiber amplifier provided by an embodiment of the present application;
[0026] Figure 2 It is a schematic diagram of the working principle of an embodiment of an actively cooled pulsed fiber amplifier provided by an embodiment of the present application;
[0027] Figure 3 It is a timing diagram of the anti-Stokes optical pulse emitted by the anti-Stokes pump, the Stokes optical pulse emitted by the Stokes pump, and the signal optical pulse emitted by the signal source in an embodiment of an actively cooled pulsed fiber amplifier provided by an embodiment of the present application;
[0028] Figure 4 It is a timing diagram of the anti-Stokes optical pulse emitted by the anti-Stokes pump, the Stokes optical pulse emitted by the Stokes pump, and the signal optical pulse emitted by the signal source in another embodiment of an actively cooled pulsed fiber amplifier provided by an embodiment of the present application;
[0029] Figure 5 It is a schematic flowchart of an embodiment of the control method of an actively cooled pulsed fiber amplifier provided by an embodiment of the present application. Specific embodiments
[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.
[0031] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically defined.
[0032] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected" and "coupled" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection, an electrical connection or a connection capable of mutual communication; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.
[0033] Referring to Figure 1 , the active cooling pulsed fiber amplifier provided by the present application includes a signal source 1, at least one anti-Stokes pump 2, at least one Stokes pump 3, and a gain fiber 5.
[0034] In the embodiment of the present application, the anti-Stokes pump 2 is used to emit anti-Stokes optical pulses at a preset frequency, where the duration of the anti-Stokes optical pulses is the first duration; the Stokes pump 3 is used to emit Stokes optical pulses at a preset frequency, where the duration of the Stokes optical pulses is the second duration; the signal source 1 is used to emit signal optical pulses at a preset frequency, and the duration of the signal optical pulses is the third duration; the gain fiber 5 is used to receive the signal optical pulses, anti-Stokes optical pulses, and Stokes optical pulses and amplify the signal light; where the photon energy of the Stokes optical pulses is greater than the photon energy of the signal optical pulses, and the photon energy of the signal optical pulses is greater than the photon energy of the anti-Stokes optical pulses; there is a target anti-Stokes optical pulse and a target Stokes optical pulse between the end times of adjacent first signal optical pulse and second signal optical pulse, the start time of the first signal optical pulse is earlier than the start time of the target anti-Stokes optical pulse, and the start time of the target Stokes optical pulse is earlier than the start time of the second signal optical pulse.
[0035] Specifically, there is a target anti-Stokes optical pulse and a target Stokes optical pulse between the end times of adjacent first signal optical pulse and second signal optical pulse. The first signal optical pulse and the second signal optical pulse are two adjacent signal optical pulses. The target anti-Stokes optical pulse is an anti-Stokes optical pulse between two adjacent signal optical pulses. The target Stokes optical pulse is a Stokes optical pulse between two adjacent signal optical pulses. Among the adjacent first signal optical pulse and second signal optical pulse, the end time of the first signal optical pulse is not later than the start time of the target anti-Stokes optical pulse, and the end time of the target Stokes optical pulse is not later than the end time of the second signal optical pulse.
[0036] In the embodiment of the present application, the signal source 1, at least one anti-Stokes pump 2, and at least one Stokes pump 3 can be one of a semiconductor laser, a solid-state laser, and a gas laser.
[0037] In the embodiment of the present application, the actively cooled pulsed fiber amplifier includes a fiber combiner 4. The input ends of the fiber combiner 4 are respectively connected to the signal source 1, the anti-Stokes pump 2, and the Stokes pump 3, and the output end of the fiber combiner 4 is connected to the gain fiber 5. The gain fiber 5 is used for signal amplification.
[0038] In the embodiment of the present application, the fiber combiner 4 is a three-in-one type of fiber combiner 4. In other embodiments, the fiber combiner 4 is a seven-in-one type of fiber combiner 4 or a nineteen-in-one type of fiber combiner 4. The fiber combiner 4 is a key optical device for efficiently combining optical signals output from multiple fibers into a single fiber, and is widely used in high-power laser systems, optical fiber communication, sensing, medical, and other fields.
[0039] As Figure 2 shown, in the active cooling pulsed fiber amplifier of the present application, the anti-Stokes pump 2 first performs pulsed pumping to generate anti-Stokes optical pulses. The anti-Stokes optical pulses enter the gain fiber 5 through the fiber combiner 4. At this time, the gain fiber 5 absorbs the energy of the anti-Stokes pump 2, and some ground-state particles absorb the energy of the anti-Stokes pump 2 and transition to the corresponding energy levels. Later, the Stokes pump 3 performs pulsed pumping to generate Stokes optical pulses. The Stokes optical pulses enter the gain fiber 5 through the fiber combiner 4. Since the photon energy corresponding to the Stokes pump 3 is greater than the photon energy of the anti-Stokes pump 2, the Stokes optical pulses will not be amplified. At this time, the gain fiber 5 absorbs the energy of the Stokes pump 3, and some ground-state particles absorb the energy of the Stokes pump 3 and transition to the corresponding energy levels. Finally, the signal optical pulses enter the gain fiber 5 through the fiber combiner 4. At this time, since the photon energy of the signal light is lower than the photon energy of the Stokes pump 3 but higher than the photon energy of the anti-Stokes pump 2, the signal light is amplified by absorbing the energy of the Stokes optical pulses through the gain fiber 5. Due to quantum deficit, some waste heat is generated, and its energy is transmitted through phonons. At this time, the upper-level particles generated by the anti-Stokes pump 2 in the gain fiber 5 absorb the phonon energy, absorb the waste heat, and release photons with a wavelength lower than that of the anti-Stokes optical pulses, completing the active cooling of the signal light amplification process.
[0040] In the embodiment of the present application, the wavelength of the anti-Stokes optical pulses is greater than the wavelength of the signal optical pulses, and the wavelength of the signal optical pulses is greater than the wavelength of the Stokes optical pulses.
[0041] In a specific embodiment, the wavelengths of the anti-Stokes optical pulses, the signal optical pulses, and the Stokes optical pulses are within the absorption spectrum or excitation spectrum of the gain fiber 5.
[0042] Specifically, the wavelength of the anti-Stokes optical pulses is 1080 nm, the wavelength of the signal optical pulses is 1030 nm, and the wavelength of the anti-Stokes optical pulses is 976 nm. Of course, in other embodiments, the wavelengths of the anti-Stokes optical pulses, the signal optical pulses, and the Stokes optical pulses can be set according to specific circumstances.
[0043] In the embodiment of the present application, the number of the Stokes pumps 3 is at least two, and the number of the anti-Stokes pumps 2 is at least two. The number of the Stokes pumps 3 can be 1, 2, or more, and the number of the anti-Stokes pumps 2 can be 1, 2, or more, which can be set according to specific circumstances.
[0044] In the embodiment of the present application, the gain fiber 5 is doped with rare earth elements. Among them, the rare earth element is ytterbium or erbium. Specifically, the gain fiber 5 is a ytterbium-doped fiber.
[0045] As Figure 3 shown, in a specific embodiment, the preset frequency is f rep . The pulse period times of the target anti-Stokes optical pulse, the target Stokes optical pulse, and the signal optical pulse are 1 / f rep . The duration of the signal optical pulse is the third duration t3. The duration of the anti-Stokes optical pulse is the first duration t1; the duration of the Stokes optical pulse is the second duration t2. Specifically, the third duration t3 is less than the first duration t1, and the third duration t3 is less than the second duration t2. In other embodiments, the durations of the third duration t3, the first duration t1, and the second duration t2 can be set according to specific circumstances, and the present application does not limit this
[0046] Among them, the start time of the target anti-Stokes optical pulse is earlier than the start time of the target Stokes optical pulse, and the start time of the target Stokes optical pulse is earlier than the start time of the second signal optical pulse. The end time of the target anti-Stokes optical pulse is not earlier than the start time of the target Stokes optical pulse, and the end time of the target Stokes optical pulse is not earlier than the start time of the second signal optical pulse. Further, the end time of the target anti-Stokes optical pulse is later than the start time of the target Stokes optical pulse, and the end time of the target Stokes optical pulse is later than the start time of the second signal optical pulse. That is, the pulse durations of the anti-Stokes optical pulse and the Stokes optical pulse overlap partially; the pulse durations of the Stokes optical pulse and the signal optical pulse overlap partially
[0047] As Figure 4 shown, in another specific embodiment, the start time of the target anti-Stokes optical pulse is earlier than the start time of the target Stokes optical pulse, and the start time of the target Stokes optical pulse is earlier than the start time of the second signal optical pulse. The end time of the target anti-Stokes optical pulse is earlier than the start time of the target Stokes optical pulse, and the end time of the target Stokes optical pulse is earlier than the start time of the second signal optical pulse. That is, the pulse durations of the anti-Stokes optical pulse and the Stokes optical pulse do not overlap; the pulse durations of the Stokes optical pulse and the signal optical pulse do not overlap
[0048] Further, referring to Figure 5 , the present application further provides a control method for an actively cooled pulsed fiber amplifier. The control method for the actively cooled pulsed fiber amplifier is applied to the control system of the actively cooled pulsed fiber amplifier. The control system of the actively cooled pulsed fiber amplifier includes a control device and the actively cooled pulsed fiber amplifier according to any one of the above. The control device is used to execute the control method for the actively cooled pulsed fiber amplifier. The control method for the actively cooled pulsed fiber amplifier includes:
[0049] 201. Control the anti-Stokes pump to emit anti-Stokes optical pulses at a preset frequency.
[0050] Among them, the duration of the anti-Stokes optical pulse is the first duration.
[0051] 202. Control the Stokes pump to emit Stokes optical pulses at a preset frequency.
[0052] Among them, the duration of the Stokes optical pulse is the second duration.
[0053] Specifically, the preset frequency is f rep . The pulse period of the target anti-Stokes optical pulse, the target Stokes optical pulse, and the signal optical pulse is 1 / f rep . After controlling the anti-Stokes pump to emit anti-Stokes optical pulses at a preset frequency, start timing. When the time reaches the first preset duration, control the Stokes pump to emit Stokes optical pulses at a preset frequency.
[0054] 203. Control the signal source to emit signal optical pulses at a preset frequency.
[0055] Among them, the duration of the signal optical pulse is the third duration.
[0056] Specifically, after controlling the Stokes pump to emit Stokes optical pulses at a preset frequency, start timing. When the time reaches the second preset duration, control the signal source to emit signal optical pulses at a preset frequency.
[0057] Compared with the related art, the active cooling pulsed fiber amplifier of the present application includes: at least one anti-Stokes pump, which is used to emit anti-Stokes optical pulses at a preset frequency, wherein the duration of the anti-Stokes optical pulses is a first duration; at least one Stokes pump, which is used to emit Stokes optical pulses at a preset frequency, wherein the duration of the Stokes optical pulses is a second duration; a signal source, which is used to emit signal optical pulses at a preset frequency, wherein the duration of the signal optical pulses is a third duration; a gain fiber, which is used to receive the signal optical pulses, anti-Stokes optical pulses and Stokes optical pulses and amplify the signal optical pulses; wherein, the photon energy of the Stokes optical pulses is greater than the photon energy of the signal optical pulses, and the photon energy of the signal optical pulses is greater than the photon energy of the anti-Stokes optical pulses; there is a target anti-Stokes optical pulse and a target Stokes optical pulse between the end times of adjacent first signal optical pulse and second signal optical pulse, the start time of the target anti-Stokes optical pulse is earlier than the start time of the target Stokes optical pulse, and the start time of the target Stokes optical pulse is earlier than the start time of the second signal optical pulse. In the active cooling pulsed fiber amplifier of the present application, the anti-Stokes pump first performs pulsed pumping to generate anti-Stokes optical pulses, and the anti-Stokes optical pulses enter the gain fiber. At this time, the gain fiber absorbs the energy of the anti-Stokes pump, and some ground-state particles absorb the energy of the anti-Stokes pump and transition to the corresponding energy levels; later, the Stokes pump performs pulsed pumping to generate Stokes optical pulses, and the Stokes optical pulses enter the gain fiber. Since the photon energy corresponding to the Stokes pump is greater than the photon energy of the anti-Stokes pump, the Stokes optical pulses will not be amplified. At this time, the gain fiber absorbs the energy of the Stokes pump, and some ground-state particles absorb the energy of the Stokes pump and transition to the corresponding energy levels; finally, the signal optical pulses enter the gain fiber. At this time, since the photon energy of the signal light is lower than the photon energy of the Stokes pump but higher than the photon energy of the anti-Stokes pump, the signal light is amplified by absorbing the energy of the Stokes optical pulses through the gain fiber. Due to quantum deficit, some waste heat is generated, and its energy is transmitted through phonons. At this time, the upper-level particles generated by the anti-Stokes pump in the gain fiber absorb the phonon energy, absorb the waste heat, and release photons with a wavelength lower than that of the anti-Stokes optical pulses, completing the active cooling of the signal light amplification process. When the amplifier amplifies the signal light, there is no need to use air cooling or water cooling to dissipate heat from the gain fiber, solving the problems of intensity and frequency noise, and reducing the occurrence of mode distortion, and can improve the heat dissipation effect of the active cooling pulsed fiber amplifier.
[0058] Moreover, the structure of the active cooling pulsed fiber amplifier in the present application is simple and has strong versatility.
[0059] The above has introduced in detail an active cooling pulsed fiber amplifier and its control method provided by the present application. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those skilled in the art, based on the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.
[0060] It should be noted that when the above embodiments of the present application are applied to specific products or technologies, and relevant user data is involved, user permission or consent is required, and the collection, use, and processing of relevant data need to comply with relevant laws, regulations, and standards.
Claims
1. An actively cooled pulsed fiber amplifier, characterized in that, The active cooling pulsed fiber amplifier includes: At least one anti-Stokes pump, which is used to emit anti-Stokes optical pulses at a preset frequency, wherein the duration of the anti-Stokes optical pulses is a first duration; At least one Stokes pump, which is used to emit Stokes optical pulses at a preset frequency, wherein the duration of the Stokes optical pulses is a second duration; A signal source, which is used to emit signal optical pulses at a preset frequency, wherein the duration of the signal optical pulses is a third duration; A gain fiber, which is used to receive the signal optical pulses, the anti-Stokes optical pulses and the Stokes optical pulses and amplify the signal light; Wherein, the photon energy of the Stokes optical pulses is greater than the photon energy of the signal optical pulses, and the photon energy of the signal optical pulses is greater than the photon energy of the anti-Stokes optical pulses; There is a target anti-Stokes optical pulse and a target Stokes optical pulse between the end times of adjacent first signal optical pulses and second signal optical pulses, the start time of the target anti-Stokes optical pulse is earlier than the start time of the target Stokes optical pulse, and the start time of the target Stokes optical pulse is earlier than the start time of the second signal optical pulse.
2. The actively cooled pulsed fiber amplifier according to claim 1, characterized in that The wavelength of the anti-Stokes optical pulses is greater than the wavelength of the signal optical pulses, and the wavelength of the signal optical pulses is greater than the wavelength of the Stokes optical pulses.
3. The actively cooled pulsed fiber amplifier according to claim 1, wherein The active cooling pulsed fiber amplifier includes an optical fiber combiner, the input ends of the optical fiber combiner are respectively connected to the signal source, the anti-Stokes pump and the Stokes pump, and the output end of the optical fiber combiner is connected to the gain fiber.
4. The actively cooled pulsed fiber amplifier according to claim 3, wherein, The optical fiber combiner is a three-in-one type optical fiber combiner, a seven-in-one type optical fiber combiner or a nineteen-in-one type optical fiber combiner.
5. The actively cooled pulsed fiber amplifier according to claim 1, wherein The number of the Stokes pumps is at least two, and the number of the anti-Stokes pumps is at least two.
6. The actively cooled pulsed fiber amplifier according to claim 1, wherein The end time of the target anti-Stokes optical pulse is not earlier than the start time of the target Stokes optical pulse, and the end time of the target Stokes optical pulse is not earlier than the start time of the second signal optical pulse.
7. The actively cooled pulsed fiber amplifier according to claim 1, wherein The end time of the target anti-Stokes optical pulse is earlier than the start time of the target Stokes optical pulse, and the end time of the target Stokes optical pulse is earlier than the start time of the second signal optical pulse.
8. The actively cooled pulsed fiber amplifier according to claim 1, wherein The gain fiber is doped with rare earth elements.
9. The actively cooled pulsed fiber amplifier according to claim 8, wherein The rare earth element is ytterbium or erbium.
10. A control method for an actively cooled pulsed fiber amplifier, characterized in that, The control method of the active cooling pulsed fiber amplifier is applied to the control system of the active cooling pulsed fiber amplifier. The control system of the active cooling pulsed fiber amplifier includes a control device and the active cooling pulsed fiber amplifier according to any one of claims 1-9. The control method of the active cooling pulsed fiber amplifier includes: Controlling the anti-Stokes pump to emit anti-Stokes optical pulses at a preset frequency, wherein the duration of the anti-Stokes optical pulses is a first duration; Control the Stokes pump to emit Stokes optical pulses at a preset frequency, wherein the duration of the Stokes optical pulses is the second duration; Control the signal source to emit signal optical pulses at a preset frequency, wherein the duration of the signal optical pulses is the third duration.