CN210245949U - High-efficiency laser multi-pass amplifying device - Google Patents
High-efficiency laser multi-pass amplifying device Download PDFInfo
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- CN210245949U CN210245949U CN201921521851.5U CN201921521851U CN210245949U CN 210245949 U CN210245949 U CN 210245949U CN 201921521851 U CN201921521851 U CN 201921521851U CN 210245949 U CN210245949 U CN 210245949U
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Abstract
The utility model provides a high efficiency laser leads to amplification device more. The device includes: two pumping source units, a gain medium and a seed light reflector group; each pump source unit includes: a pump source and a pump light reflector; the seed light reflector set comprises: a first seed light reflector, a second seed light reflector and a third seed light reflector; the gain medium is cylindrical, the upper bottom surface of the gain medium is provided with a first film layer, the lower bottom surface of the gain medium is provided with a second film layer, the side surface of the gain medium is provided with threads, the pumping source unit is positioned on the upper bottom surface side of the gain medium, and the reflecting surface of the pumping light reflector faces the upper bottom surface of the gain medium; the seed light reflector group is positioned on the lower bottom surface side of the gain medium; the first film layer reflects seed light and transmits pumping light, and the second film layer transmits seed light and reflects pumping light. The utility model discloses an increase the number of times that the pump light pierces through the gain medium, also can reduce horizontal parasitic oscillation by a wide margin when keeping amplifier output efficiency.
Description
Technical Field
The utility model relates to an ultrashort pulse laser amplifier technical field especially relates to an based on high efficiency laser leads to amplification device more.
Background
Currently, a femtosecond laser system based on a Chirped Pulse Amplification (CPA) technology can reach the peak power of 10 PW. When high peak power is pursued, as the terminal amplifier must use a large-caliber gain medium, the transverse gain of the terminal amplifier is far larger than the longitudinal gain, when the energy density of the pumping laser is high enough, transverse parasitic oscillation can be generated in the gain medium, and the energy stored in the gain medium is consumed; in addition, when the gain medium absorbs the pump light, part of the energy is stored in the gain medium to raise the temperature of the gain medium, and the temperature gradient in the gain medium in the thermal equilibrium state causes the gain medium to become a lens-like medium, i.e., a thermal lens effect. The thermal lens effect not only can cause the distortion of the wavefront of the amplified laser seed source beam, but also can cause the beam to be focused, which can cause the mismatch of the laser seed source and the pump light spatial mode, and the energy extraction efficiency is reduced. Therefore, how to overcome the above difficulties will be the key to further increase the peak power of the laser.
Common measures to suppress lateral parasitic oscillations are: the refractive index matching fluid is used on the surface of the crystal, so that the loss of the transverse parasitic oscillation is increased, and the transverse parasitic oscillation is inhibited; however, this measure has a limited effect because the refractive index of the matching fluid varies with polarization and wavelength, making it difficult to achieve complete refractive index matching. Or, by increasing the thickness of the gain medium, the doping concentration and the pump light absorption coefficient are reduced, and the transverse gain can be effectively reduced; however, this measure requires the use of a thick gain medium, which increases the cost and material dispersion, making subsequent pulse compression more difficult.
Disclosure of Invention
The problem that the suppression effect that exists is limited, influences amplifier output efficiency to the in-process of current laser amplifier at suppression transverse parasitic oscillation and thermal lens effect, the utility model provides a high efficiency laser leads to amplification device more.
In a first aspect, the utility model provides a high efficiency laser leads to amplification device more, include: two pumping source units, a gain medium and a seed light reflector group; each of the pump source units includes: a pump source and a pump light reflector; the seed light reflector set comprises: a first seed light reflector, a second seed light reflector and a third seed light reflector;
the gain medium is cylindrical, a first film layer is arranged on the upper bottom surface of the gain medium, a second film layer is arranged on the lower bottom surface of the gain medium, threads are arranged on the side surface of the gain medium, the pumping source unit is positioned on the upper bottom surface side of the gain medium, the pumping light reflector is positioned between the pumping source and the gain medium and on a reflection light path generated after the pumping light generated by the pumping source is reflected by the gain medium, and the reflection surface of the pumping light reflector faces the upper bottom surface of the gain medium; the seed light reflector group is positioned on the lower bottom surface side of the gain medium; the first film layer reflects seed light and transmits pumping light, and the second film layer transmits seed light and reflects pumping light.
Further, the pump light generated by the pump source in one of the pump source units avoids the pump light reflector in the other pump source unit to enter the gain medium, is reflected by the lower bottom surface of the gain medium and penetrates through the gain medium again, is reflected by the pump light reflector in one of the pump source units, and returns back along the original path to penetrate through the gain medium;
the seed laser enters the gain medium after being reflected by the first seed light reflector, is reflected by the upper bottom surface of the gain medium and penetrates through the lower bottom surface of the gain medium, then enters the gain medium after being reflected by the second seed light reflector and the third seed light reflector in sequence, and is amplified after being reflected by the upper bottom surface of the gain medium and penetrating through the lower bottom surface of the gain medium.
Further, the included angle of the lens centers of the first seed light reflector and the second seed light reflector is larger than zero; the included angle of the lens centers of the first sub-light reflector and the third sub-light reflector is larger than zero.
Furthermore, a reflecting surface of each pump light reflector is plated with a pump light zero-incidence high-reflection film; and the reflecting surface of each seed light reflector in the seed light reflector group is plated with a seed light 45-degree incident high-reflection film.
Further, a cooling device is arranged on the side face of the gain medium.
In a second aspect, the present invention further provides a high-efficiency laser multi-pass amplifying device, including: first pumping source, gain medium, dichroscope and seed light reflector group, seed light reflector group includes: a first seed light reflector, a second seed light reflector and a third seed light reflector;
the gain medium is cylindrical, and the side surface of the gain medium is provided with threads; the dichroic mirror is positioned on the upper bottom surface side of the gain medium, the seed light reflector group and the first pumping source are positioned on the lower bottom surface side of the gain medium, the reflecting surface of the seed light reflector group faces the lower bottom surface of the gain medium, and the non-reflecting surface of the seed light reflector group faces the first pumping source;
pumping light generated by the first pumping source penetrates through gaps among various seed light reflectors in the seed light reflector group and is incident to the gain medium; the seed laser enters and penetrates through the gain medium after being reflected by the first seed light reflector, enters and penetrates through the gain medium again after being reflected by the double-color mirror, then enters and penetrates through the gain medium after being reflected by the second seed light reflector and the third seed light reflector in sequence, and enters and penetrates through the gain medium after being reflected by the double-color mirror, so that amplification is completed.
Furthermore, antireflection films for enhancing the transmission of the seed laser and the pumping light are plated on the upper bottom surface and the lower bottom surface of the gain medium; and a cooling device is also arranged on the side surface of the gain medium.
Further, the included angle of the lens centers of the first seed light reflector and the second seed light reflector is larger than zero; the included angle of the lens centers of the first sub-light reflector and the third sub-light reflector is larger than zero.
Furthermore, a high reflection film with zero-degree incidence reflection of pump light and 5-degree incidence of seed light is plated on the dichroic mirror; and the reflecting surface of each seed light reflector in the seed light reflector group is plated with a seed light 45-degree incident high-reflection film.
Further, the dual-color filter further comprises a second pumping source, the second pumping source is located on the upper bottom surface side of the gain medium, and the dichroic mirror is located between the second pumping source and the gain medium.
The utility model has the advantages that:
(1) the utility model discloses a set up two pump light reflection mirrors in gain medium one side to and plated seed light reflection, pump light transmission membrane and seed light transmission, pump light reflection membrane in two bottom surfaces of gain medium, make the pump light can be many times through the gain medium, at the total absorption rateI(L) (the absorptivity of the gain medium to the laser light is knownI(L) Satisfies the following conditions:I(L)=I0*e αL-. Wherein,αin order to be able to take advantage of the absorption coefficient,Llength through the gain medium),Lthe absorption coefficient of pump light can be greatly reduced by increasing several timesαThe lateral gain is also reduced. Therefore, on the basis of need not to increase gain medium thickness, the utility model discloses an increase the number of times that the pumping light pierces through the gain medium, be equivalent to increased lengthLTherefore, the utility model discloses also can reduce horizontal parasitic oscillation by a wide margin when keeping amplifier output efficiency. And owing to plated seed light reflectance coating and make in last bottom surface the utility model discloses a whole amplifier chamber length shortens half than traditional amplifier that leads to more, makes the device volume reduce by a wide margin, can reduce the influence of thermal lens effect to the amplifier by a wide margin, and overall structure is compacterAnd further improve stability.
(2) The utility model discloses a set up dichroscope and seed light reflecting mirror respectively in gain medium both sides, the seed laser forms a type of falling V through second seed light reflecting mirror, third kind seed light reflecting mirror, dichroscope, compares with the chamber length of traditional amplifier (all set up seed light reflecting mirror in gain medium both sides), the utility model discloses a chamber length of amplifier can shorten one time, can reduce the influence of thermal lens effect to the amplifier by a wide margin, and overall structure is compacter, and then promotes stability.
(3) By arranging the threads on the side face of the gain medium, the spontaneously radiated light cannot be reflected back and forth on the side edge of the gain medium due to the inclined angle of the thread, so that the transverse parasitic oscillation can be effectively reduced.
(4) The utility model discloses need not increase gain medium thickness, consequently can not increase the material chromatic dispersion, be favorable to follow-up pulse compression.
Drawings
Fig. 1 is a schematic structural diagram of a high-efficiency laser multi-pass amplifying device according to an embodiment of the present invention;
fig. 2 is a second schematic structural diagram of a high-efficiency laser multi-pass amplifying device according to an embodiment of the present invention.
Reference numerals: the laser device comprises a seed laser source 1, a first seed light reflector 2, a second seed light reflector 3, a third seed light reflector 4, a first pumping source 5, a second pumping source 6, a gain medium 7, a cooling device 8, a dichroic mirror 9, a first pumping light reflector 10, a second pumping light reflector 11, an upper bottom surface S1 and a lower bottom surface S2.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the following description will clearly describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1, the utility model also provides a high efficiency laser leads to amplification device more, include: two pumping source units, a gain medium 7, a cooling device 8 and a seed light reflector group; the embodiment of the utility model provides an in two pumping source units do respectively: a first pump source unit and a second pump source unit. The first pump source unit includes: a first pump source 5 and a first pump light mirror 10; the second pump source unit includes: a second pump source 6 and a second pump light mirror 11; the seed light reflector set comprises: a first seed light reflector 2, a second seed light reflector 3 and a third seed light reflector 4;
the gain medium 7 is a cylindrical body, the upper bottom surface S1 of the gain medium 7 is provided with a first film layer, the lower bottom surface S2 is provided with a second film layer, the side surface is provided with threads, the side surface of the gain medium 7 is provided with the cooling device 8, the pumping source unit is located on the upper bottom surface S1 side of the gain medium 7, wherein the pumping light reflector is located between the pumping source and the gain medium 7 and on a reflection light path generated by the pumping source after the pumping light is reflected by the gain medium, and the reflection surface of the pumping light reflector faces the upper bottom surface of the gain medium 7, in the embodiment of the present invention, the reflection surfaces of the first pumping light reflector 10 and the second pumping light reflector 11 both face the upper bottom surface S1 of the gain medium 7; the first pump light reflector 10 is located on a reflected light path of the pump light generated by the first pump source 5 after being reflected by the gain medium 7; the second pump light reflector 11 is located on a reflected light path on which the pump light generated by the second pump source 6 is reflected by the gain medium 7; the seed light reflector group is positioned on the lower bottom surface S2 side of the gain medium 7; the first film layer reflects seed light and transmits pumping light, and the second film layer transmits seed light and reflects pumping light.
The side face of the gain medium 7 is provided with the threads, and because the threads have an inclination angle, the spontaneously radiated light cannot be reflected back and forth on the side face of the gain medium 7, so that the transverse parasitic oscillation can be effectively reduced, and meanwhile, the heat dissipation area of the gain medium 7 can be increased. In order to reduce the thermal lens and the thermal birefringence effect, the embodiment of the present invention further includes a cooling device 8 mounted on the side surface of the gain medium 7, wherein the cooling device 8 surrounds the side surface of the gain medium 7 for a circle. The cooling medium used in the cooling device 8 may be a liquid such as water or a mixed liquid, or may be a gas capable of generating a low temperature such as compressed helium gas.
The pump light generated by the pump source in one of the pump source units avoids the pump light reflector in the other pump source unit, enters the gain medium 7, is reflected by the lower bottom surface S2 of the gain medium 7 and penetrates through the gain medium 7 again, is reflected by the pump light reflector in one of the pump source units, and returns back along the original path to penetrate through the gain medium 7. Specifically, taking the optical path of the first pump source 5 as an example: the pump light generated by the first pump source 5 avoids the second pump light reflector 11 (e.g., passes over or sideways from the second pump light reflector 11, i.e., does not penetrate the second pump light reflector 11), transmits through the upper bottom surface S1 of the gain medium 7, enters the gain medium 7, reflects at the lower bottom surface S2 of the gain medium 7, and penetrates the upper bottom surface S1 of the gain medium 7 again; the pump light has now passed through the gain medium 7 2 times; then, the pump light penetrating the upper bottom surface S1 of the gain medium 7 again hits the first pump light reflector 10, is reflected by the first pump light reflector 10, turns back along the original path, and finally avoids the second pump light reflector 11 (for example, passes over or beside the second pump light reflector 11), so that the pump light can penetrate the gain medium 7 between the first pump light reflector 10 and the second pump light reflector 11 for 4 times; at this time, since the pump light passes through the gain medium a plurality of times, the energy of the pump light is substantially absorbed by the gain medium. Similarly, the optical path of the second pump source 6 is not described in detail here.
The absorption rate of the gain medium for the laser light is knownI(L) Satisfies the following conditions:I(L)=I0*e αL-. Wherein,αin order to be able to take advantage of the absorption coefficient,Lis the length through the gain medium. Since the pump light can pass through the gain medium for multiple times, the total absorption rateI(L) Under the condition of fixation, the water-soluble polymer,Lincreasing several times can greatly reduce the pump light absorption systemNumber ofαThe lateral gain is also reduced. Therefore, on the basis of need not to increase gain medium thickness, the utility model discloses an increase the number of times that the pumping light pierces through the gain medium, be equivalent to increased lengthLTherefore, the utility model discloses also can reduce horizontal parasitic oscillation by a wide margin when keeping amplifier output efficiency. In addition, because the utility model does not need to increase the thickness of the gain medium, the material dispersion can not be increased, which is beneficial to the subsequent pulse compression; and owing to plated seed light reflection film and make in last bottom surface the utility model discloses a whole amplifier chamber length shortens half than the tradition amplifier that leads to more, can reduce the influence of thermal lens effect to the amplifier by a wide margin, and overall structure is compacter, and then promotes stability.
The seed laser generated by the seed laser source 1 is reflected by the first seed light reflector 2, passes through the lower bottom surface S2 of the gain medium 7, enters the gain medium 7, is reflected by the upper bottom surface S1 of the gain medium 7 and penetrates through the lower bottom surface S2 of the gain medium 7, is then reflected by the second seed light reflector 3 and the third seed light reflector 4 in sequence and enters the gain medium 7, is reflected by the upper bottom surface S1 of the gain medium 7 and penetrates through the lower bottom surface S2 of the gain medium, and then amplification is completed.
In the embodiment of the present invention, a seed laser source 1 is configured as a titanium sapphire preamplifier, which outputs a seed laser pulse with a central wavelength of 800nm, a bandwidth of about 60nm, an energy of 5J, and a pulse width repetition frequency of 0.1 to 10Hz, two pump sources are configured to output pulses with a central wavelength of 532nm, an energy of 50J, and a pulse width repetition frequency of 0.1 to 10Hz, a gain medium 7 is selected from a titanium sapphire crystal, which has excellent optical, thermal and mechanical properties, and is a laser crystal with excellent performance, the diameter of two bottom surfaces of the gain medium 7 is 80mm, the length of a cylinder is 20mm, a first seed light reflector 2, a second seed light reflector 3, and a third seed light reflector 4 are configured as plane mirrors with a size of phi 110mm × 10mm, the reflection surface of each seed light reflector in a seed light reflector group is plated with a high reflection film with a seed light incident angle of 45 degrees, in the embodiment, the seed light reflector group is plated with a high reflection film with a seed light incident angle of 750nm to 850nm 45 degrees on the reflection surfaces of the seed light reflectors of the seed laser reflectors, the seed reflectors are plated with a gain reflection effect of 750nm to 850nm, the second seed reflection media, the seed reflection mirrors are plated with a gain medium, the same height of 750nm, the same height of the seed reflection media, the seed reflection mirrors, the seed reflection media, the seed reflection mirrors, the seed reflection media are plated with a gain media plated with a second seed reflection media, the same height of 750nm, the same height of the.
As shown in fig. 2, the embodiment of the present invention further provides a high efficiency laser multi-pass amplifying device, which includes: first pumping source 5, second pumping source 6, gain medium 7, cooling device 8, dichroic mirror 9 and seed light reflector group, seed light reflector group includes: a first seed light reflector 2, a second seed light reflector 3 and a third seed light reflector 4;
the gain medium 7 is cylindrical, and the side surface of the gain medium 7 is provided with threads; the cooling device 8 is arranged on the side surface of the gain medium 7, the second pumping source 6 and the dichroic mirror 9 are positioned on the upper bottom surface S1 side of the gain medium 7, and the dichroic mirror 9 is positioned between the second pumping source 6 and the gain medium 7; the seed optical reflector group and the first pump source 5 are positioned on the side of the lower bottom surface S2 of the gain medium 7, the reflecting surface of the seed optical reflector group faces the lower bottom surface S2 of the gain medium 7, and the non-reflecting surface of the seed optical reflector group faces the first pump source 5; the centers of the first pumping source 5, the second pumping source 6 and the dichroic mirror 9 are located at the same horizontal position.
The pump light generated by the first pump source 5 is transmitted through the gaps between the seed light reflectors in the seed light reflector set and then enters the gain medium 7. The pump light generated by the second pump source 6 penetrates the dichroic mirror 9 and is incident on the gain medium 7. The seed laser generated by the seed laser source 1 enters and penetrates the gain medium 7 after being reflected by the first seed light reflector 2, enters and penetrates the gain medium 7 again after being reflected by the dichroic mirror 9, then enters and penetrates the gain medium 7 after being reflected by the second seed light reflector 3 and the third seed light reflector 4 in sequence, and finishes amplification after entering and penetrating the gain medium 7 after being reflected by the dichroic mirror 9. According to the light path process of the seed laser, the seed laser can pass through the gain medium 7 for 4 times, is amplified and then leaves the high-efficiency laser multi-pass amplifying device. In this embodiment, the seed laser forms an inverted V-shape through the second seed light reflector 3, the third seed light reflector 4 and the dichroic mirror 9, and compares with the cavity length of the traditional amplifier (seed light reflectors are arranged on both sides of the gain medium), the cavity length of the amplifier of the present invention can be shortened by one time.
The included angle β 1 between the centers of the first seed light reflector 2 and the second seed light reflector 3 is 5-20 degrees, and the included angle β 2 between the centers of the first seed light reflector 2 and the third seed light reflector 4 is 5-10 degrees.
In order to realize the high transmission effect on the seed light and the pump light at the two bottom surfaces of the gain medium 7, antireflection films for enhancing the transmission of the seed light and the pump light are respectively plated on the upper bottom surface and the lower bottom surface of the gain medium 7, and the two bottom surfaces may be optically polished before being plated with the antireflection films.
In the embodiment of the present invention, the difference from the embodiment of the present invention is that: two pumping sources are arranged on two sides of a gain medium 7, the doping concentration of titanium ions in the gain medium 7 is 0.04wt%, and antireflection films on the upper bottom surface and the lower bottom surface are both 750 nm-850 nm and 532nm antireflection films. Size phi 80mm 10mm of dichroic mirror 9, it increases the reflection to plate pumping light zero degree incidence on dichroic mirror 9, seed light 5 degree incidence high reflection film, in the embodiment of the utility model, 532nm zero degree incidence increases the reflection on dichroic mirror 9, 750~850nm 5 degree incidence high reflection film. The rest of the parameter settings are the same as those of the embodiment of the present invention, and are not described herein again.
The side face of the gain medium 7 is provided with the threads, and because the threads have an inclination angle, the spontaneously radiated light cannot be reflected back and forth on the side face of the gain medium 7, so that the transverse parasitic oscillation can be effectively reduced, and meanwhile, the heat dissipation area of the gain medium 7 can be increased. In order to reduce the thermal lens and the thermal birefringence effect, the embodiment of the present invention further includes a cooling device 8 mounted on the side surface of the gain medium 7, wherein the cooling device 8 surrounds the side surface of the gain medium 7 for a circle. The cooling medium used in the cooling device 8 may be a liquid such as water or a mixed liquid, or may be a gas capable of generating a low temperature such as compressed helium gas.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (10)
1. A high efficiency laser multipass amplification device, comprising: two pumping source units, a gain medium and a seed light reflector group; each of the pump source units includes: a pump source and a pump light reflector; the seed light reflector set comprises: a first seed light reflector, a second seed light reflector and a third seed light reflector;
the gain medium is cylindrical, a first film layer is arranged on the upper bottom surface of the gain medium, a second film layer is arranged on the lower bottom surface of the gain medium, threads are arranged on the side surface of the gain medium, the pumping source unit is positioned on the upper bottom surface side of the gain medium, the pumping light reflector is positioned between the pumping source and the gain medium and on a reflection light path generated after the pumping light generated by the pumping source is reflected by the gain medium, and the reflection surface of the pumping light reflector faces the upper bottom surface of the gain medium; the seed light reflector group is positioned on the lower bottom surface side of the gain medium; the first film layer reflects seed light and transmits pumping light, and the second film layer transmits seed light and reflects pumping light.
2. The apparatus of claim 1, wherein the pump light generated by the pump source in one of the pump source units enters the gain medium while avoiding the pump light reflector in the other pump source unit, is reflected by the lower bottom surface of the gain medium and penetrates through the gain medium again, is reflected by the pump light reflector in the one of the pump source units, and then passes through the gain medium along the original path by being folded back;
the seed laser enters the gain medium after being reflected by the first seed light reflector, is reflected by the upper bottom surface of the gain medium and penetrates through the lower bottom surface of the gain medium, then enters the gain medium after being reflected by the second seed light reflector and the third seed light reflector in sequence, and is amplified after being reflected by the upper bottom surface of the gain medium and penetrating through the lower bottom surface of the gain medium.
3. The device of claim 1, wherein the first seed light reflector and the second seed light reflector have an included angle of their centers greater than zero; the included angle of the lens centers of the first sub-light reflector and the third sub-light reflector is larger than zero.
4. The device according to claim 1, wherein the reflection surface of each pump light reflector is coated with a pump light zero-degree incident high-reflection film; and the reflecting surface of each seed light reflector in the seed light reflector group is plated with a seed light 45-degree incident high-reflection film.
5. The apparatus according to any one of claims 1 to 4, wherein the side of the gain medium is further provided with a cooling means.
6. A high efficiency laser multipass amplification device, comprising: first pumping source, gain medium, dichroscope and seed light reflector group, seed light reflector group includes: a first seed light reflector, a second seed light reflector and a third seed light reflector;
the gain medium is cylindrical, and the side surface of the gain medium is provided with threads; the dichroic mirror is positioned on the upper bottom surface side of the gain medium, the seed light reflector group and the first pumping source are positioned on the lower bottom surface side of the gain medium, the reflecting surface of the seed light reflector group faces the lower bottom surface of the gain medium, and the non-reflecting surface of the seed light reflector group faces the first pumping source;
pumping light generated by the first pumping source penetrates through gaps among various seed light reflectors in the seed light reflector group and is incident to the gain medium; the seed laser enters and penetrates through the gain medium after being reflected by the first seed light reflector, enters and penetrates through the gain medium again after being reflected by the double-color mirror, then enters and penetrates through the gain medium after being reflected by the second seed light reflector and the third seed light reflector in sequence, and enters and penetrates through the gain medium after being reflected by the double-color mirror, so that amplification is completed.
7. The device of claim 6, wherein the upper bottom surface and the lower bottom surface of the gain medium are coated with antireflection films for enhancing the transmission of the seed laser and the pump light; and a cooling device is also arranged on the side surface of the gain medium.
8. The device of claim 6, wherein the first seed light reflector and the second seed light reflector have an included angle of their centers greater than zero; the included angle of the lens centers of the first sub-light reflector and the third sub-light reflector is larger than zero.
9. The device according to claim 6, wherein the dichroic mirror is coated with a pump light zero-degree incidence antireflection film and a seed light 5-degree incidence high-reflection film; and the reflecting surface of each seed light reflector in the seed light reflector group is plated with a seed light 45-degree incident high-reflection film.
10. The apparatus of claim 9, further comprising a second pump source located on an upper bottom surface side of the gain medium, the dichroic mirror being located between the second pump source and the gain medium.
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|---|---|---|---|---|
| CN110556697A (en) * | 2019-09-12 | 2019-12-10 | 河南省启封新源光电科技有限公司 | High-efficiency laser multi-pass amplifying device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110556697A (en) * | 2019-09-12 | 2019-12-10 | 河南省启封新源光电科技有限公司 | High-efficiency laser multi-pass amplifying device |
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