CN116722435A - Multi-beam Brillouin amplification device and laser amplification method - Google Patents
Multi-beam Brillouin amplification device and laser amplification method Download PDFInfo
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- CN116722435A CN116722435A CN202310834318.9A CN202310834318A CN116722435A CN 116722435 A CN116722435 A CN 116722435A CN 202310834318 A CN202310834318 A CN 202310834318A CN 116722435 A CN116722435 A CN 116722435A
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- 238000003199 nucleic acid amplification method Methods 0.000 title claims abstract description 99
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000005086 pumping Methods 0.000 claims abstract description 15
- 230000000694 effects Effects 0.000 claims description 22
- 230000008859 change Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 7
- 230000003287 optical effect Effects 0.000 description 5
- 230000003044 adaptive effect Effects 0.000 description 4
- 238000001069 Raman spectroscopy Methods 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002310 reflectometry Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 1
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- 229910003460 diamond Inorganic materials 0.000 description 1
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- 230000002035 prolonged effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/30—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects
Abstract
The disclosure relates to a multi-beam Brillouin amplification device and a laser amplification method, and relates to the field of laser amplification. The multi-beam Brillouin amplifying device comprises: at least two amplifying units which are arranged in sequence, wherein gain media are arranged in the amplifying units; the seed light longitudinally propagates through the gain medium in at least two amplifying units; the propagation direction of the seed light is consistent with the arrangement direction of at least two amplifying units; at least two pumping light beams are symmetrically distributed about the propagation direction of the seed light and are injected into gain media in at least two amplifying units at a preset angle, so that Brillouin amplification is realized. By applying the laser amplification device and the laser amplification method, the laser can be effectively amplified.
Description
Technical Field
The application relates to the technical field of laser, in particular to the field of laser amplification, and particularly relates to a multi-beam Brillouin amplification device and a laser amplification method.
Background
The short laser pulse amplification using plasma as the gain medium is not limited by the damage threshold of the solid-state optical device, so that the laser intensity far higher than that obtained by the chirped pulse amplification technology can be obtained. The energy of the pump laser pulse with longer duration can be transferred to the seed light with shorter pulse time through a three-wave coupling process by taking the plasma as a medium, so that the continuous amplification of the short pulse seed light is realized. The three-wave coupling processes that can be utilized include Stimulated Raman Scattering (SRS) with electron plasmons as wavelets and Stimulated Brillouin Scattering (SBS) with ion plasmons as wavelets.
Current research into raman amplification processes that utilize stimulated raman scattering or stimulated brillouin scattering for laser pulse amplification has demonstrated great potential in constructing compact, low cost, ultra-high intensity laser systems. The stimulated Brillouin scattering has the advantages that the pumping light and the seed light can be generated by the same equipment, an additional seed light generating device is not needed, the frequency mismatch of the pumping light and the seed light is avoided, and the plasma temperature and density nonuniformity tolerance is higher. In order to fully utilize the advantages of SBS for laser amplification, the amplification factor is improved, a proper amplification strategy needs to be designed, and a proper parameter space is selected to realize high amplification factor.
Disclosure of Invention
The embodiment of the disclosure provides a multi-beam Brillouin amplification device and a laser amplification method.
In a first aspect, embodiments of the present disclosure provide a multi-beam brillouin amplification device, including: at least two amplifying units which are arranged in sequence, wherein gain media are arranged in the amplifying units; the seed light longitudinally propagates through the gain medium in at least two amplifying units; the propagation direction of the seed light is consistent with the arrangement direction of at least two amplifying units; at least two pumping light beams are symmetrically distributed about the propagation direction of the seed light and are injected into gain media in at least two amplifying units at a preset angle, so that Brillouin amplification is realized.
In a second aspect, embodiments of the present disclosure provide a laser amplification method, including: determining a plurality of parameters of the multi-beam brillouin amplification device as described in the first aspect; setting part of parameters in the plurality of parameters as corresponding preset values, and determining the amplifying effect of the multi-beam Brillouin amplifying device when the rest parameters take values in a preset value range; determining the values of other parameters according to the amplification effect; and amplifying the laser by using a multi-beam Brillouin amplifying device according to the determined value.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the disclosure, nor is it intended to be used to limit the scope of the disclosure. Other features of the present disclosure will become apparent from the following specification.
Drawings
The drawings are for a better understanding of the present solution and are not to be construed as limiting the present disclosure. Wherein:
FIG. 1 is a schematic diagram of the structure of one embodiment of a multi-beam Brillouin amplification device of the present disclosure;
fig. 2 is a schematic diagram of an operation principle of an amplifying unit in the multi-beam brillouin amplifying device of the present disclosure;
FIG. 3 is a schematic diagram of another embodiment of a multi-beam Brillouin amplification device of the present disclosure;
fig. 4 is a flow diagram of one embodiment of a laser amplification method of the present disclosure.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments in accordance with the present disclosure. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
Embodiments of the present disclosure and features of embodiments may be combined with each other without conflict.
In order to make the technical scheme and advantages of the present disclosure more apparent, the present disclosure will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 shows a schematic structural diagram of one embodiment of a multi-beam brillouin amplification device of the present disclosure. As shown in fig. 1, the multi-beam brillouin amplification device 100 of the present embodiment may include at least two amplification units which are sequentially arranged. In the present embodiment, three amplifying units are described as an example, and the three amplifying units are an amplifying unit 101, an amplifying unit 102, and an amplifying unit 103, respectively. A gain medium 104 is provided in each amplification unit. The gain medium (i.e., laser working substance) is a substance system for realizing population inversion and generating stimulated radiation amplification of light, and is sometimes referred to as a laser gain medium, and may be a solid (crystal, glass), a gas (atomic gas, ion gas, molecular gas), a semiconductor, a liquid, or the like.
The seed light 105 propagates longitudinally through the gain medium 104 within each amplification unit. The seed light 105 may be provided by a seed laser. The seed light 105 sequentially passes through the gain medium 104 in each amplifying unit. The direction in which the seed light 105 propagates is referred to as a longitudinal direction, and the direction perpendicular to the propagation direction of the seed light 105 may be referred to as a lateral direction.
In this embodiment, the propagation direction of the seed light 105 coincides with the arrangement direction of the amplifying units 103, 102, 101. This ensures that the seed light 105 is maximally injected into the gain medium 104 in the amplifying units 101, 102, 103 to maximize the amplifying effect.
The multi-beam brillouin amplification device 100 according to the present embodiment may further include at least two pump lights 106. The pump light 106 is symmetrically distributed with respect to the propagation direction of the seed light 105. The pump light 106 is incident into the gain medium of each amplifying unit at a predetermined angle. In this way, in a single gain medium, two beams of pump light and one beam of seed light are coupled, photons in the seed light absorb the energy of the pump light, and the override is realized, so that the optical amplification can be realized.
The principle of the multi-beam brillouin amplification device 100 in the present embodiment to realize optical amplification is described in theory by a schematic diagram shown in fig. 2.As shown in fig. 2, the seed light propagates along the longitudinal direction of the gain medium, and the two pump lights are symmetrically distributed with respect to the propagation direction of the seed light. The lateral width of the two pumping lights is omega 0 The crossing angle between them is 2 theta h . Thus, the overlapping part of the two pumping lights is a diamond with the longitudinal length L || ＝ω 0 sinθ h A transverse length L ⊥ ＝ω 0 cosθ h . Maximum gain length L a By the longitudinal length L of the overlapping portions || Longitudinal length L of gain medium p Is determined by the minimum value of L a ＝min[L || ,L p ]。
From the above equation, if it is desired to increase the maximum gain length L a The longitudinal length L of the overlapping portion can be increased || Or longitudinal length L of gain medium p . Longitudinal length L of overlap || Can be equivalently increased by using a plurality of pump light sources arranged in parallel to increase the lateral dimension omega of the pump light 0 . In this embodiment, by arranging at least two amplifying units in sequence in the longitudinal direction, the length L of the gain medium is prolonged p Thereby realizing the maximum gain length L a Is increased.
The multi-beam Brillouin amplification device provided by the embodiment of the present disclosure can increase the maximum gain length, thereby improving the optical amplification effect.
With continued reference to fig. 3, there is shown a schematic structural diagram of another embodiment of a multi-beam brillouin amplification device according to the present disclosure. As shown in fig. 3, in the present embodiment, the multi-beam brillouin amplification device 300 may include at least two amplifying units which are sequentially arranged. Here, three amplifying units are taken as an example, and it should be noted that the present disclosure is only limited to three amplifying units, and the number of amplifying units in the present disclosure is not limited to three.
Gain media 302 are provided in each amplification unit 301. The seed light 303 propagates longitudinally through the gain medium 302 within each amplification unit. The propagation direction of the seed light 303 coincides with the arrangement direction of the respective amplifying units 301. At least two pump light beams 304 are symmetrically distributed with respect to the propagation direction of the seed light 303, and are injected into the gain medium 302 of each amplifying unit 301 at a preset angle, so as to realize brillouin amplification.
In this embodiment, a reflecting device 305 is disposed between each amplifying unit, and each reflecting device 305 is used to reflect two beams of pump light emitted from a previous amplifying unit into a subsequent amplifying unit. Here, the reflecting means may be a mirror. Further, in order to improve the reflectivity, a film having a high reflectivity to the wavelength of the pump light may be coated on the reflecting mirror.
In some alternative implementations, each reflective device 305 is symmetrically distributed about the propagation direction of the seed light 303. Therefore, no additional pumping light source is needed, and only two pumping light sources are needed to provide pumping light for each amplifying unit.
In some alternative implementations, the pump light 304 is emitted by a pump light source 306. The pump light source 306 is disposed at one side of each pump light 304 sequentially arranged. Therefore, on one hand, the pumping light source can be conveniently moved or replaced, and on the other hand, the number of the amplifying units can be conveniently adjusted.
In some alternative implementations, the pump light sources 306 are symmetrically distributed about the propagation direction of the seed light 303. Thus, the pump light which is incident to the gain medium at a preset angle can be conveniently emitted.
In some alternative implementations, the gain medium is a plasma. The plasma is used as a gain medium and can not be limited by the damage threshold of the solid-state optical device, so that the laser intensity far higher than that obtained by the chirped pulse amplification technology can be obtained.
In some alternative implementations, the order of the seed light 303 passing through the gain media is opposite to the order of the pump light passing through the gain media. Thus, in each gain medium, two pump light beams and one seed light beam can be coupled forward, and photons are excited to be higher order.
In some specific practices, a simple two-beam amplification scheme is used, and the plasma parameter takes n e /n c =0.05, te=50 eV, ti=1 eV, laser wavelength 1.053um, intensity 2×10 15 W/cm 2 The included angle of the two light beams is 10 degrees, the pumping light is heated to generate plasma with the size of 1mm, at the moment, the length of the recommended seed light pulse is 0.1ps, and the peak value is 2 multiplied by 10 15 W/cm 2 At this time, the single-stage amplification can realize 20 times of amplification of the seed light, and in practice, the amplification factor oc (NM) can be further increased by adopting more stages (M) or more crossed beams (N) 3/4 。
The multi-beam Brillouin amplification device provided by the embodiment of the present disclosure can effectively save the number of pumping light sources, thereby reducing the cost.
With continued reference to fig. 4, a flow 400 of one embodiment of a laser amplification method according to the present disclosure is shown. As shown in fig. 4, the laser amplification method of the present embodiment needs to apply the multi-beam brillouin amplification device shown in fig. 1 or 3. The method of the present embodiment may include the steps of:
in step 401, a plurality of parameters of a multi-beam brillouin amplifying device are determined.
In this embodiment, the execution body of the laser amplification method (for example, a control device connected to the multi-beam brillouin amplification device) may first determine a plurality of parameters of the multi-beam brillouin amplification device. Specifically, the execution body may determine a plurality of variables according to a formula of the brillouin amplification principle. In this embodiment, the key parameters affecting the brillouin amplification include the gain length L a Plasma parameters (including electron density, electron temperature, and ion temperature), pump light intensity and duration, and intensity and duration of seed light. When further considering the two-dimensional effect, the crossing angle 2 theta of the two pump lights h Lateral width ω of pump light 0 Lateral width ω of seed light s And also has an effect on the amplification efficiency.
Step 402, setting a part of the parameters as corresponding preset values, and determining the amplifying effect of the multi-beam brillouin amplifying device when the rest of the parameters take values within a preset value range.
The execution body may set a value for a part of the plurality of parameters in advance, and set a value range for the remaining parameters. For example, the intensity and duration of the pump light and the intensity and duration of the seed light may be set to preset values, and the value ranges of the remaining parameters may be determined according to the attribute of the device or may be determined according to a priori knowledge. The execution body can continuously adjust other parameters to take different values in the corresponding value range according to the formula for calculating the amplifying effect, and calculate the specific value of the amplifying effect.
And step 403, determining the values of the rest parameters according to the amplification effect.
The execution body can determine the value of each parameter when taking the maximum value according to the calculated amplification effect value.
Step 404, amplifying the laser by using a multi-beam brillouin amplifying device according to the determined value.
The execution body may use the determined values of the parameters as the values of the parameters in the multi-beam brillouin amplification device. Or the execution body can use the determined values as ideal values, and fine-tune the values according to the actual installation environment or the actual application scene of the multi-beam Brillouin amplifying device to obtain the adaptive parameters suitable for the multi-beam Brillouin amplifying device. And then, configuring the multi-beam Brillouin amplifying device by using the adaptive parameters to realize laser amplification.
The laser amplification method provided by the embodiment of the disclosure can determine parameters of the adaptive multi-beam Brillouin amplification device, fully utilize the amplification performance of the adaptive multi-beam Brillouin amplification device, and improve the amplification efficiency.
In some optional implementations of this embodiment, the method may further include the following steps not shown in fig. 4: and determining a change relation curve between a single parameter in the plurality of parameters and other parameters when the amplification effect is optimal.
In this implementation manner, the execution body may determine an optimal amplification effect of the multi-beam brillouin amplification device. The optimal amplifying effect can be used as the optimal amplifying effect which can be explored at present. Then, the execution subject may take the value of the single parameter as the dependent variable and the values of the remaining parameters as the independent variable in this case, to obtain a variation relationship between the single parameter and the other parameters. Therefore, a technician can conveniently further determine a plurality of parameter values according to the curve, and the parameter values can keep the optimal amplifying effect. When one set of parameter values is not available, the method can be switched to the other set of parameter values. The disaster recovery performance of the multi-beam Brillouin amplification device is improved.
In some optional implementations of this embodiment, the method may further include the following steps not shown in fig. 4: and visually displaying the amplifying effect.
Through the implementation mode, a technician can clearly know the amplification effect of the multi-beam Brillouin amplification device, so that the device can be debugged more conveniently.
In summary, a scheme for increasing the amplification factor by using multiple beams and multiple pump light is provided, which proves that the amplification factor of the seed light can be approximated (n×la) after selecting proper seed light amplitude and duration 3/4 Where N is the number of pump light beams, la. Alpha. M is the equivalent amplification length, and M is the number of pump light stages. Compared with the prior art, the application has good expansibility, and can easily realize nearly hundred times of gains of subpicosecond and femtosecond pulses by increasing the level or the number of light beams.
The foregoing description of the preferred embodiments of the present disclosure is not intended to limit the disclosure, but rather to cover all modifications, equivalents, improvements and alternatives falling within the spirit and principles of the present disclosure.
Claims (10)
1. A multi-beam brillouin amplification device comprising: at least two amplifying units which are sequentially arranged, wherein gain media are arranged in the amplifying units;
the seed light longitudinally propagates through the gain medium in the at least two amplifying units;
the propagation direction of the seed light is consistent with the arrangement direction of the at least two amplifying units;
at least two pumping light beams are symmetrically distributed about the propagation direction of the seed light and are injected into gain media in the at least two amplifying units at a preset angle, so that Brillouin amplification is realized.
2. The multi-beam brillouin amplification device according to claim 1, wherein a reflecting means for reflecting two pump light beams emitted from a previous amplification unit into a subsequent amplification unit is provided between the at least two amplification units.
3. A multi-beam brillouin amplification device according to claim 2, wherein the reflecting means is symmetrically distributed with respect to the propagation direction of the seed light.
4. The multi-beam brillouin amplification device according to claim 1, wherein the at least two pump light beams are emitted by two pump light sources;
the two pumping light sources are arranged in front of the first amplifying unit of the at least two amplifying units which are arranged in sequence.
5. The multi-beam brillouin amplification device according to claim 4, wherein the two pumping light sources are symmetrically distributed with respect to a propagation direction of the seed light.
6. A multi-beam brillouin amplification device according to any one of claims 1 to 5, wherein the gain medium is a plasma.
7. The multi-beam brillouin amplification device according to claim 1, wherein the order in which the seed light passes through each gain medium is opposite to the order in which the at least two pump lights pass through each gain medium.
8. A laser amplification method comprising:
determining a plurality of parameters of a multi-beam brillouin amplification device as claimed in any one of claims 1 to 7;
setting part of the parameters as corresponding preset values, and determining the amplifying effect of the multi-beam Brillouin amplifying device when the rest parameters take values within a preset value range;
determining the values of the rest parameters according to the amplification effect;
and amplifying the laser by using the multi-beam Brillouin amplifying device according to the determined value.
9. The laser amplification method of claim 8, wherein the method further comprises:
and determining a change relation curve between a single parameter in the plurality of parameters and other parameters when the amplification effect is optimal.
10. The laser amplification method of claim 8, wherein the method further comprises:
and visually displaying the amplifying effect.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310834318.9A CN116722435A (en) | 2023-07-07 | 2023-07-07 | Multi-beam Brillouin amplification device and laser amplification method |
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| CN202310834318.9A CN116722435A (en) | 2023-07-07 | 2023-07-07 | Multi-beam Brillouin amplification device and laser amplification method |
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