CN110556697A - High-efficiency laser multi-pass amplifying device - Google Patents
High-efficiency laser multi-pass amplifying device Download PDFInfo
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- CN110556697A CN110556697A CN201910864050.7A CN201910864050A CN110556697A CN 110556697 A CN110556697 A CN 110556697A CN 201910864050 A CN201910864050 A CN 201910864050A CN 110556697 A CN110556697 A CN 110556697A
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- 238000005086 pumping Methods 0.000 claims abstract description 68
- 230000000149 penetrating effect Effects 0.000 claims abstract description 6
- 238000001816 cooling Methods 0.000 claims description 15
- 230000003321 amplification Effects 0.000 claims description 7
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 4
- 230000002708 enhancing effect Effects 0.000 claims description 3
- 230000010355 oscillation Effects 0.000 abstract description 12
- 230000003071 parasitic effect Effects 0.000 abstract description 12
- 230000001965 increasing effect Effects 0.000 abstract description 11
- 238000010521 absorption reaction Methods 0.000 description 11
- 239000013078 crystal Substances 0.000 description 11
- 229910052719 titanium Inorganic materials 0.000 description 11
- 239000010936 titanium Substances 0.000 description 11
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 10
- 230000000694 effects Effects 0.000 description 10
- 229910052594 sapphire Inorganic materials 0.000 description 8
- 239000010980 sapphire Substances 0.000 description 8
- 230000010287 polarization Effects 0.000 description 7
- 230000003287 optical effect Effects 0.000 description 6
- 239000007789 gas Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000002826 coolant Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- -1 titanium ions Chemical class 0.000 description 1
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
- H01S3/02—Constructional details
- H01S3/04—Arrangements for thermal management
- H01S3/042—Arrangements for thermal management for solid state lasers
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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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/0602—Crystal lasers or glass lasers
- H01S3/061—Crystal lasers or glass lasers with elliptical or circular cross-section and elongated shape, e.g. rod
-
- 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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/0619—Coatings, e.g. AR, HR, passivation layer
- H01S3/0621—Coatings on the end-faces, e.g. input/output surfaces of the laser light
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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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/0619—Coatings, e.g. AR, HR, passivation layer
- H01S3/0621—Coatings on the end-faces, e.g. input/output surfaces of the laser light
- H01S3/0623—Antireflective [AR]
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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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
- H01S3/0813—Configuration of resonator
- H01S3/0815—Configuration of resonator having 3 reflectors, e.g. V-shaped resonators
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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
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
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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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10084—Frequency control by seeding
Abstract
The invention provides a high-efficiency laser multi-pass amplifying device. 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 invention can greatly reduce the transverse parasitic oscillation while maintaining the output efficiency of the amplifier by increasing the times of the pump light penetrating the gain medium.
Description
Technical Field
The invention relates to the technical field of ultrashort pulse laser amplifiers, in particular to a high-efficiency laser multi-pass amplifying device.
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.
To suppress the lateral parasitic oscillation, chinese patent CN104253373A discloses a titanium sapphire laser amplifier: the method aims to inhibit the parasitic oscillation effect of the titanium sapphire laser amplifier by controlling the polarization of pump light, and specifically comprises the following steps: when the polarization of the pump light is parallel to the crystal axis of the titanium sapphire (pi polarization), the absorption sectional area of the titanium sapphire crystal is the largest; when the polarization of the pump light is perpendicular to the crystal axis of the titanium sapphire (σ polarization), the absorption cross-sectional area of the titanium sapphire crystal is minimal. The lateral gain of the titanium sapphire crystal can be reduced by varying the pump light polarization. The ti-sapphire laser amplifier disclosed in this patent can reduce the lateral gain of the gain medium, but if the length of the gain medium is fixed, the absorption rate of the pump light is reduced, and the amplifier efficiency is reduced. In addition, 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 invention provides a high-efficiency laser multi-pass amplifying device, aiming at the problems that the existing laser amplifier has limited suppression effect and influences the output efficiency of the amplifier in the process of suppressing transverse parasitic oscillation and thermal lens effect.
In a first aspect, the present invention provides a high efficiency laser multipass amplifier, 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.
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 multipass amplifier, 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 invention has the beneficial effects that:
(1) According to the invention, two pumping light reflecting mirrors are arranged on one side of a gain medium, and two bottom surfaces of the gain medium are plated with a seed light reflecting film, a pumping light transmitting film, a seed light transmitting film and a pumping light reflecting film, so that pumping light can pass through the gain medium for multiple times, and the total absorption rate I (L) (the known absorption rate I (L) of the gain medium for laser is satisfied that I (L) = I 0 × e - αL , wherein α is an absorption coefficient, and L is the length of passing through the gain medium), the L is increased by multiple times, so that the absorption coefficient α of the pumping light can be greatly reduced, and the transverse gain is also reduced at the same time.
(2) According to the invention, the dichroic mirror and the seed light reflector are respectively arranged on two sides of the gain medium, the seed laser forms an inverted V shape through the second seed light reflector, the third seed light reflector and the dichroic mirror, and compared with the cavity length of a traditional amplifier (the seed light reflectors are arranged on two sides of the gain medium), the cavity length of the amplifier disclosed by the invention can be shortened by one time, the influence of a thermal lens effect on the amplifier can be greatly reduced, the whole structure is more compact, and the stability is further improved.
(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 invention does not need to increase the thickness of the gain medium, thereby not increasing the dispersion of the material and being beneficial to the subsequent 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 technical solutions in the embodiments of the present invention will be clearly described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the present invention also provides a high efficiency laser multipass amplifier, comprising: two pumping source units, a gain medium 7, a cooling device 8 and a seed light reflector group; the two pump source units in the embodiment of the invention are 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 side of the upper bottom surface S1 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 cooling device 8 is further installed on the side surface of the gain medium 7, and the cooling device 8 surrounds the side surface of the gain medium 7. 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 I (L) of the known gain medium to the laser light satisfies I (L) = I 0 × e - αL , wherein α is an absorption coefficient, L is a length passing through the gain medium, L can be increased by several times to greatly reduce the absorption coefficient α of the pump light and simultaneously reduce the transverse gain under the condition that the total absorption rate I (L) is fixed because the pump light can pass through the gain medium for many times, therefore, on the basis of not increasing the thickness of the gain medium, the invention increases the times of the pump light penetrating through the gain medium, which is equivalent to increasing the length L, so that the invention can greatly reduce the transverse parasitic oscillation while maintaining the output efficiency of the amplifier, in addition, the invention does not need to increase the thickness of the gain medium, thereby not increasing the material dispersion and being beneficial to the subsequent pulse compression, and because the seed light reflection film is plated on the upper bottom surface, the length of the whole amplifier cavity of the invention is shortened by half compared with the length of the traditional multi-pass amplifier, thereby greatly reducing the influence of the thermal lens effect on the amplifier, the whole structure is more compact.
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 invention, a seed laser source 1 is arranged as a titanium sapphire preamplifier, seed laser pulses with the central wavelength of 800nm, the bandwidth of about 60nm, the energy of 5J and the pulse width repetition frequency of 0.1 5910 Hz are output, two pumping sources are arranged to output pulses with the central wavelength of 532nm, the energy of 50J and the pulse width repetition frequency of 0.1 ~ Hz, a titanium sapphire crystal is selected as a gain medium 7, the titanium sapphire crystal has excellent optical performance, thermal conductivity and mechanical performance 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 reflecting mirror 2, a second seed light reflecting mirror 3 and a third seed light reflecting mirror 4 are arranged to have the size phi 110mm multiplied by 10mm, the reflecting surface of each seed light reflecting mirror in a seed light reflecting mirror group is plated with a high reflection film with the incident angle of 45 degrees of the seed light, in the seed light reflecting mirror group is plated with a high reflection film with the size of 750nm and 850nm 45 degrees, in the reflecting mirror group, in the embodiment, the seed light reflecting mirror group, the reflecting mirror group is plated with the same as a reflection mirror, the reflection mirror 3, the reflection mirror, the two pumping sources are plated with the same crystal reflection mirror, the same crystal, the gain reflection mirror, the same, the gain reflection mirror is plated with the same height reflection mirror, the same as the reflection mirror, the gain reflection mirror, the second seed reflection mirror is plated with the second seed reflection mirror, the second seed reflection mirror is plated with the second seed reflection mirror, the same height reflection mirror, the same as the second seed reflection mirror, the second seed reflection mirror, the.
As shown in fig. 2, an embodiment of the present invention further provides a high-efficiency laser multi-pass amplifying apparatus, including: 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 passes through the second seed light reflector 3, the third seed light reflector 4 and the dichroic mirror 9 to form an inverted V shape, and the cavity length of the amplifier of the present invention can be shortened by one time compared with the cavity length of the conventional amplifier (the seed light reflectors are disposed on both sides of the gain medium).
the included angle beta 1 of the lens centers of the first seed light reflector 2 and the second seed light reflector 3 is 5 ~ 20 degrees, and the included angle beta 2 of the lens 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 above embodiment of the present invention is that two pumping sources are disposed on two sides of the gain medium 7, the doping concentration of titanium ions in the gain medium 7 is 0.04wt%, the antireflection films on the upper bottom surface and the lower bottom surface are both 750nm 85850 nm and 532nm antireflection films, the size of the dichroic mirror 9 is Φ 80mm × 10mm, the dichroic mirror 9 is plated with a pumping light zero-incidence antireflection film and a seed light 5-degree incidence high-reflection film, in the embodiment of the present invention, the dichroic mirror 9 is plated with a 532nm zero-incidence antireflection film and a 750nm ~ nm 5-degree incidence high-reflection film, and the settings of the other parameters are the same as those in the above embodiment of the present invention, and are not repeated here.
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 cooling device 8 is further installed on the side surface of the gain medium 7, and the cooling device 8 surrounds the side surface of the gain medium 7. 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 examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
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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