Laser system and device

Abstract

The invention discloses a laser system and device.The laser system comprises a sunlight automatic tracking and condensing device, a solar cell device and a laser device with a laser resonant cavity, the laser resonant cavity comprises laser ceramic, a gain medium is formed on the laser ceramic, and the laser system further comprises a light splitting device; the light splitting device is used for receiving the light beam from the sunlight automatic tracking and condensing device and splitting the light beam into light beams with different wavebands: a pumping gain light beam which is guided to directly irradiate a gain medium of the laser ceramic so as to generate laser by stimulated radiation; the non-pumping light beam is used for photovoltaic power generation through a solar photovoltaic panel array of a solar cell device. Efficient separation of solar spectrums is achieved through the light splitting system, pumping wave band light is reflected to the gain medium, other wave bands are transmitted to the solar cell array, the influence of the heat effect can be effectively reduced, and the sunlight energy utilization rate can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of solar energy, and in particular relates to a laser system and a device. Background Art

[0002] As a clean and renewable energy source, solar energy has significant potential in pump laser systems due to its wide spectral range. Traditional laser systems require multiple energy conversions, while solar pumping directly uses broad-spectrum sunlight and can achieve laser pumping without a complex conversion process, with high energy utilization efficiency. Solar-pumped laser systems are of great significance in the fields of space communications, remote detection, and atmospheric analysis. In addition, under conditions of sufficient sunlight, solar-pumped laser systems can efficiently output laser beams, providing broad application prospects for future laser weapons and space energy transmission.

[0003] Nowadays, environmental problems and energy crises are becoming increasingly prominent. How to efficiently utilize clean and renewable energy such as solar energy is of utmost importance. Traditional methods of collecting sunlight mostly use Fresnel lenses or parabolic mirrors to focus sunlight on the end or side of the gain medium for pumping the gain medium. However, this concentration method is prone to generate high temperatures at the focus point. The accumulated heat has an adverse effect on the gain medium, and thermal lens effects are prone to occur, affecting the beam quality of the laser.

[0004] Therefore, in view of the above technical problems, it is necessary to provide a laser system and device.

[0005] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0006] The object of the present invention is to provide a laser system and device.

[0007] In order to achieve the above object, a technical solution provided by a specific embodiment of the present invention is as follows:

[0008] A laser system, comprising a sunlight automatic tracking and concentrating device, a solar cell device, and a laser device having a laser resonant cavity, wherein the laser resonant cavity comprises laser ceramics, a gain medium is formed on the laser ceramics, and a spectrometer is further included, wherein the spectrometer is used to receive a light beam from the sunlight automatic tracking and concentrating device and to split the light beam into light beams of different wavelength bands:

[0009] A pump gain beam is guided to directly irradiate the gain medium of the laser ceramic to generate laser light by stimulated emission of radiation;

[0010] The non-pump beam is a solar cell device with a photovoltaic panel array to generate photovoltaic power.

[0011] In one or more embodiments of the present invention, the laser ceramic is selected from: Nd:YAG, Ce:Nd:YAG. .

[0012] In one or more embodiments of the present invention, the light splitting device is one or a combination of the following: a dichroic mirror with a coating, a grating, or a prism.

[0013] In one or more embodiments of the present invention, the selection of the pump gain beam by the optical splitting device satisfies any of the following:

[0014] When the gain medium is Nd:YAG, the wavelength range of the pump gain beam meets the following requirements: 700nm-820nm;

[0015] When the gain medium is Ce, Nd: YAG, the wavelength range of the pump gain beam meets: 430nm-470nm and 700nm-820nm.

[0016] In one or more embodiments of the present invention, the coating of the dichroic mirror includes a high-reflection film matched to the pump gain beam, and the high-reflection film is used for the pump gain beam to pump the gain medium; and / or

[0017] The anti-reflection film is matched to the non-pump light beam, and the anti-reflection film is used for the non-pump light beam to be transmitted by the dichroic mirror and then used for the solar photovoltaic panel array to generate electricity.

[0018] In one or more embodiments of the present invention, the Nd doping amount in the gain medium Nd:YAG is 1.0-1.1 at.%. Preferably, the Nd doping amount in the gain medium Nd:YAG is 1.0 at.%.

[0019] In one or more embodiments of the present invention, the doping amounts of Ce and Nd in the gain medium Ce:Nd:YAG are 0.05-0.1 at. % and 1.0-1.1 at. %, respectively.

[0020] In one or more embodiments of the present invention, the high-reflection film and / or anti-reflection film in the coating is a composite film formed by alternating coatings of high-refractive index materials (the high-refractive index materials can be selected from titanium dioxide, zirconium oxide, silicon carbide, etc.) and low-refractive index materials (the low-refractive index materials can be selected from silicon dioxide, magnesium fluoride, calcium fluoride, etc.).

[0021] In one or more embodiments of the present invention, an apparatus includes a body and a laser system disposed to the body.

[0022] Compared with the prior art, the laser system and device of the present invention can effectively separate spectra of different bands by using a spectroscopic system, thereby improving pumping efficiency and spectrum utilization. The spectroscopic system can efficiently reflect specific bands such as 430-470nm and 700-820nm in sunlight, which can be used to pump Ce and Nd respectively, thereby improving pumping efficiency. At the same time, other bands that are not suitable for pumping are transmitted to the solar cell array for photoelectric conversion, thereby significantly improving the overall utilization efficiency of sunlight.

[0023] The present invention can also use the spectroscopic system to effectively reduce the impact of thermal effects on the gain medium and improve the quality of laser output. The traditional collected and concentrated sunlight spot has a high power density, and long-term operation will accumulate heat and affect the quality of laser output. The spectroscopic system can separate specific pump light to the gain medium, reduce heat accumulation, and effectively improve the thermal lens effect, thereby improving the stability of laser output and the beam quality.

[0024] The present invention makes full use of the combined design of the light splitting system and the gain medium, and can coordinate the material selection spectrum to maximize the utilization of sunlight.

[0025] The present invention uses a spectroscopic system and can also achieve multi-band spectral separation and control, simplifying the design, avoiding overly complex optical paths, and further improving the efficiency of the system. At the same time, materials that are resistant to high temperatures and have a small thermal expansion coefficient can enable the system to operate stably for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a schematic diagram of the principle of the laser system of the present invention;

[0028] Figure 2 This is a schematic diagram of a light splitting system and a gain medium in Example 1 of the present invention;

[0029] Figure 3 This is a schematic diagram of a light splitting system and a gain medium in Example 2 of the present invention;

[0030] Figure 4 This is a schematic diagram of a light splitting system and a gain medium in Example 3 of the present invention;

[0031] Figure 5 This is a schematic diagram of a light splitting system and a gain medium in Example 4 of the present invention;

[0032] Figure 6is the solar spectrum curve;

[0033] Figure 7 It is the absorption spectrum of Nd:YAG and Ce:Nd:YAG;

[0034] Figure 8 This is the response curve of the solar cell. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0036] A laser system that uses a spectroscopic system to realize solar light pumping and driving may include a solar light automatic tracking and focusing system, a spectroscopic system, a solar cell array, and a laser system. The solar light automatic tracking and focusing system is integrated with a Fresnel lens or a parabolic mirror condenser group and a solar automatic tracking system; the spectroscopic system is a "dichroic mirror", a grating, a prism, etc., or a combination of a lens and a reflector; the solar cell array constitutes a power drive system; the laser system includes laser ceramics and a resonant cavity, and the laser ceramics and the optical mirror groups at both ends constitute a laser resonant cavity. The concentrated sunlight selectively reflects the pump light into the gain medium through the spectroscopic system, and transmits other bands into the solar cell array for power generation. The laser medium absorbs the reflected sunlight to generate stimulated radiation to produce lasers, and the electricity generated by the solar cell array is used to power the solar positioning system and the control system; the resonant cavity is used to enhance the oscillation and amplification of the laser.

[0037] The automatic tracking and focusing system for sunlight can be specifically implemented in the following way: a Fresnel lens or a parabolic mirror is mounted on a rotatable frame to collect sunlight, and the automatic tracking system controls the angle through feedback from a photosensor and a servo motor, so that the focusing system is always aimed at the sun and the light is accurately focused onto the spectroscopic system.

[0038] The spectroscopic system is used to separate specific wavelength bands of sunlight, reflecting wavelengths suitable for pumping laser gain media, while transmitting non-pumping wavelengths to the solar cell array to achieve efficient use of sunlight.

[0039] The working material of the spectroscopic system, such as the membrane material, can be a material that is resistant to high temperatures and has a small thermal expansion coefficient, ensuring that it can maintain stable operation under high light intensity and high temperature conditions. The coating process and materials used ensure that it has multi-angle efficient reflection capabilities at different incident angles, thereby achieving stable spectral separation.

[0040] Preferably, the light splitting system has a multi-layer coating structure or adopts a grating or prism design, and can selectively transmit and reflect light of different wavelength bands.

[0041] For example, when the gain medium is Nd:YAG, the spectroscopic system realizes efficient reflection (reflectivity 99%) in the 700nm-820nm band for pumping the gain medium, while transmitting light in other bands (transmittance 85%) to the solar cell array.

[0042] Specifically, if the light splitting system is a dichroic mirror, it is designed to be coated with a high-reflection film in the 700nm-820nm band to reflect light to the gain medium for pumping, and coated with a broadband anti-reflection film to transmit non-pumping light in other bands into the solar cell array for photoelectric conversion;

[0043] Or, when the gain medium is Ce, Nd: YAG, the spectroscopic system realizes efficient reflection (reflectivity 99%) in the 430nm-470nm and 700nm-820nm bands for pumping the gain medium, while transmitting light in other bands (transmittance 85%) to the solar cell array.

[0044] Specifically, if the light splitting system is a dichroic mirror, it is designed to be coated with a high-reflection film in the 430nm-470nm and 700nm-820nm bands, and the reflected light pumps the Ce ions and Nd ions respectively, and a broadband anti-reflection film is coated to transmit non-pumping light in other bands to the solar cell array;

[0045] The gain medium adopts laser ceramics, which is composed of a polycrystalline structure and has a uniform distribution of doping ions, ensuring optical transparency and high laser conversion efficiency.

[0046] Preferably, the laser ceramic is selected from Nd:YAG, Ce:Nd:YAG and the like.

[0047] The laser resonant cavity output mirror is a plane mirror, a plano-convex mirror or a plano-concave mirror, coated with a high-reflection film for pulsed lasers in a required wavelength band and a dielectric film that partially reflects and partially transmits the required pulsed laser wavelength band.

[0048] like Figure 1 As shown, a laser system that uses a splitter system to achieve sunlight pumping and driving includes a sunlight automatic tracking and focusing integrated system 1, a splitter system 2, a laser system 3, and a control and power system 4; the splitter system plays a role in efficiently separating pumping light from non-pumping light, which can effectively reduce the impact of thermal effects on the laser system and improve the utilization rate of sunlight.

[0049] The solar light automatic tracking and focusing integrated system 1 specifically includes a condenser lens group, a photosensitive sensor and other devices. The condenser lens group is a Fresnel lens or a compound parabolic mirror; the light splitting system 2 shown has a multi-layer coating structure or adopts a grating or prism design, which can selectively transmit and reflect light of different wavelengths. The laser system 3 shown includes a gain medium and a resonant cavity, and the gain medium is placed on a workbench through a fixture. The control power system 4 shown includes a microcontroller and a servo motor.

[0050] The Fresnel lens or parabolic mirror is fixed on a rotating frame, which is connected to a servo motor. A photosensitive sensor is installed near the mirror group and connected to a microcontroller to detect the position of sunlight. The electrical energy converted by the solar cell array and the electrical energy of the battery are used for power supply.

[0051] The photosensitive sensor detects the direction of sunlight and transmits the position signal to the microcontroller. The microcontroller calculates the deviation angle and instructs the servo motor to adjust the angle of the Fresnel lens or parabolic mirror so that the condenser group always keeps pointing at the sun and accurately focuses the sunlight onto the light splitting system 2.

[0052] The focused sunlight selectively reflects and transmits light of different wavelengths through the spectroscopic system. The pump light is reflected to the gain medium, which absorbs the pump light and generates laser light through stimulated radiation and generates laser oscillation in the resonant cavity; the non-pump light is transmitted to the solar cell array for photoelectric conversion, and the generated electrical energy provides power support for the servo motor and control system.

[0053] Embodiment 1:

[0054] This embodiment selects Figure 2 Combination scheme, the spectroscopic system 2 uses a combination of a dichroic mirror 2-1 and a gain medium Nd:YAG. In order to achieve selective and efficient transmission and reflection of sunlight, the dichroic mirror 2-1 adopts a distributed Bragg reflector (DBR) structure, that is, a multilayer interference film of TiO2 (high refractive index, refractive index n = 2.3) and SiO2 (low refractive index, refractive index n = 1.45) alternately stacked. The central wavelength is set to 760nm, and the optical thickness of each film is one-fourth of the wavelength (760nm), that is, the physical thickness of TiO2 is about 82nm, the physical thickness of SiO2 is about 131nm, and 12 pairs (a total of 24 layers) are alternately stacked, which can achieve a reflectivity of >98% in the 700nm-820nm band, and a transmittance of >90% in other bands. A layer of SiO2 protective film (thickness 100nm) is covered on the outer layer to improve tolerance, so as to maintain stable operation. The complete film system structure is [(HL) 12 +P].

[0055] The gain medium used is Nd (1.0 at.%):YAG ceramic, which is yttrium aluminum garnet (YAG, Y3Al5O 12 ) polycrystalline ceramics, compared with Nd:YAG single crystal, this ceramic material has lower cost, higher thermal conductivity, mechanical strength and durability, higher power application, and the gain has better absorption efficiency, better thermal conductivity, higher laser output efficiency and stability compared with Nd:YVO4 (neodymium-doped yttrium vanadate), making it perform better in solar light pumping applications. The light reflected by the dichroic mirror 2-1 is further focused into the gain medium by the focusing lens 2-2, and the rest of the light is transmitted to the solar cell. The solar irradiance collected in this system is 1000W / m 2 In case:

[0056] When Nd:YAG is pumped in the full band, the heat load generated is 368W / m 2 , the battery power generation efficiency is 23%, and the laser output is about 35W / m 2 .

[0057] When the 700nm-820nm band is separated by the optical splitting system of this scheme to pump the same medium, the heat load generated is 123W / m 2 The power generation efficiency is 20.8%, and the laser output power is about 33W / m 2 It can be seen that when the heat is reduced to one third, the impact on power generation efficiency is only (2.2% / 23%=0.096). However, this greatly reduced heat originally requires a lot of electricity to drive the cooling water for heat dissipation, which not only maintains the stable operation of the laser, but also saves electricity consumption.

[0058] Embodiment 2:

[0059] This embodiment selects Figure 3Combination scheme, relative to Example 1, the dichroic mirror 3-1 in the spectroscopic system 2 realizes efficient reflection of 430nm-470nm, 700nm-820nm, and the remaining bands realize efficient transmission. The Bragg reflector (DBR) structure is combined with multilayer interference film optimization. Titanium dioxide (TiO2, refractive index n = 2.3) is selected as the high refractive index material, and silicon dioxide (SiO2, refractive index n = 1.45) is selected as the low refractive index material. In the range of 430nm-470nm, a total of 9 pairs (18 layers) of Bragg reflectors with a central wavelength of 450nm are designed, the layer thickness of TiO2 is about 49nm, and the layer thickness of SiO2 is about 78nm; in the range of 700nm-820nm, a total of 12 pairs (24 layers) of Bragg reflectors with a central wavelength of 760nm are designed, the layer thickness of TiO2 is about 82nm, and the layer thickness of SiO2 is about 131nm. In addition, a SiO2 anti-reflection layer with an optical thickness of λ / 2 (physical thickness of about 138nm) is added on the top of the film system to optimize the transmission performance of the 470nm-700nm and >820nm bands. The complete film system structure is [(HL) 9 +(HL) 12 +L], achieving a pump light reflectivity of >98% and a non-pump light transmittance of >90%.

[0060] The gain medium becomes Ce:Nd:YAG transparent laser ceramics, whose Ce 3+ and Nd 3+ The doping concentrations of the two-color mirror 3-1 are 0.05% and 1.0% respectively. The material is also a transparent laser ceramic. Compared with single crystal materials, this ceramic material has lower cost, higher thermal conductivity, mechanical strength and durability, higher power application, and is suitable for solar light pumping. The light reflected by the dichroic mirror 3-1 is further focused into the gain medium by the focusing lens 3-2, and the remaining light is transmitted to the solar cell. When the solar irradiance is 1000W / m 2 In case:

[0061] When Ce:Nd:YAG is pumped in the full band, the heat load generated is 414W / m 2 , the battery power generation efficiency is 22%, and the laser output is about 45W / m 2

[0062] When the spectral splitting system of this scheme is used to separate the 430nm-470nm and 700nm-820nm bands to pump the same medium, the heat load generated is 195W / m 2 , power generation efficiency is 19.2%, laser output is about 42.9W / m 2It can be seen that when the heat is reduced to about half, the impact on the power generation efficiency is only (2.8% / 22%=0.127). Similarly, the reduced heat originally requires very high electrical energy to drive the cooling water for heat dissipation, which not only maintains the stable operation of the laser, but also saves electricity consumption.

[0063] Example 3

[0064] This embodiment selects Figure 4 Combination scheme, relative to Example 1, the light splitting system 2 is a combination of a blazed grating 4-2, a collimating lens 4-1, and a converging lens 4-3 to separate specific bands of sunlight, and achieve efficient reflection and transmission. The gain medium remains unchanged, and is also Nd (1.0at.%): YAG transparent laser ceramic. Compared with single crystal materials, this ceramic material has lower cost, higher thermal conductivity, mechanical strength and durability, higher power application, and is suitable for solar light pumping. First, the collimating lens 4-1 converts the divergent light beam into parallel light, which is incident on the surface of the blazed grating 4-2, wherein the blazed grating 4-2 uses a line density of 1200 lines / mm, and optimizes its blazing wavelength to 750nm so that the 700nm-820nm band light is efficiently reflected in the first-order diffraction, and converged to the gain medium through the converging lens 4-3, while other bands of light are transmitted to the solar cell. The pump light reflectivity is 85%-90%, and the non-pump light transmittance is 80%-90%. When the solar irradiance is 1000W / m 2 In case:

[0065] Using full-band pump gain medium, the generated heat load is 313W / m 2 , the battery power generation efficiency is 22%.

[0066] When the grating is used to separate the pump light for Nd:YAG pumping, the heat load generated is about 105W / m 2 , the battery power generation efficiency is 19.6%. It can be seen that when the heat is reduced to one third, the impact on the power generation efficiency is only (2.4% / 22%=0.109). Similarly, the greatly reduced heat originally requires a lot of electricity to drive the cooling water for heat dissipation, which not only maintains the stable operation of the laser, but also saves electricity consumption.

[0067] Example 4

[0068] This embodiment selects Figure 5Combination scheme, compared with Example 2, the spectroscopic system 2 includes a collimating lens 5-1, a first-stage grating 5-2, a focusing lens 5-3, a second-stage grating 5-4 and a focusing lens 5-5. The light is incident on the first-stage grating through the collimating lens to form a parallel light beam, and the first grating (blazing wavelength 450nm, 1800 lines / mm) realizes the reflection of the 430nm-470nm band. The reflected 430nm-470nm pump light is converged to the gain medium through the converging lens 5-3, and the remaining light beams are transmitted. The transmitted light beam enters the second-stage grating (blazing wavelength 750nm, 1200 lines / mm), realizing efficient reflection of the 700nm-820nm band. The reflected 700nm-820nm light is also converged to the gain medium through the converging lens 5-5, while transmitting other bands. The gain medium remains unchanged, and the Ce:Nd:YAG transparent laser ceramics of Example 2 are selected. Compared with single crystal materials, this ceramic material has lower cost, higher thermal conductivity, mechanical strength and durability, higher power application, and is suitable for solar light pumping. Through the entire spectroscopic system, the pump light reflectivity reaches 85%-90%, and the non-pump light transmittance reaches 80%-90%. When the solar irradiance is 1000W / m 2 In case:

[0069] Full-band pumping of the gain medium generates a heat load of 373W / m 2 , the battery power generation efficiency is 21%.

[0070] When the spectroscopic system of this scheme uses pump light of a specific wavelength for pumping, the heat load generated is about 165W / m2, and the battery power generation efficiency is 18.5%. It can be seen that when the heat is reduced by 45%, the impact on the power generation efficiency is only (2.5% / 21%=0.119). Similarly, the greatly reduced heat originally requires very high electrical energy to drive the cooling water for heat dissipation, which not only maintains the stable operation of the laser, but also saves electricity consumption.

[0071] Example 5

[0072] The difference between this embodiment and embodiment 1 is that the gain medium Nd (1.1 at.%):YAG ceramic is yttrium aluminum garnet (YAG, Y3Al5O 12 ) polycrystalline ceramics.

[0073] The samples in this embodiment are subjected to a solar irradiance of 1000 W / m 2 In the case of full-band pumping of Nd:YAG, the heat load generated is 390W / m 2 The battery power generation efficiency is 22.5%, and the laser output is about 37.8W / m 2

[0074] When the 700nm-820nm band is separated by the optical splitting system of this scheme to pump the same medium, the heat load generated is 130W / m 2 , power generation efficiency is 20.5%, laser output is about 35.64W / m 2 It can be seen that when the heat is reduced to one third, the impact on the power generation efficiency is only (2% / 22.5%=0.089). However, this greatly reduced heat originally requires a lot of electricity to drive the cooling water for heat dissipation, which not only maintains the stable operation of the laser, but also saves electricity consumption.

[0075] Example 6

[0076] The difference between this embodiment and embodiment 1 is that the gain medium Nd (1.05 at.%):YAG polycrystalline ceramic is yttrium aluminum garnet (YAG, Y3Al5O 12 )ceramics.

[0077] The samples in this embodiment are subjected to a solar irradiance of 1000 W / m 2 In the case of full-band pumping of Nd:YAG, the heat load generated is 375W / m 2 The battery power generation efficiency is 22.8%, and the laser output is about 36.8W / m 2 .

[0078] When the 700nm-820nm band is separated by the optical splitting system of this scheme to pump the same medium, the heat load generated is 125W / m 2 , power generation efficiency is 20.6%, laser output is about 34.7W / m 2 It can be seen that when the heat is reduced to one third, the impact on power generation efficiency is only (2.2% / 22.8%=0.096). However, this greatly reduced heat originally requires a lot of electricity to drive the cooling water for heat dissipation, which not only maintains the stable operation of the laser, but also saves electricity consumption.

[0079] Example 7

[0080] The difference between this embodiment and embodiment 2 is that the gain medium is changed to Ce:Nd:YAG transparent laser ceramics. 3+ and Nd 3+ The doping concentrations are 0.08% and 1.05% atomic percentage respectively.

[0081] The samples in this embodiment are subjected to a solar irradiance of 1000 W / m 2 In case:

[0082] When Ce:Nd:YAG is pumped in the full band, the heat load generated is 430W / m 2, the battery power generation efficiency is 21.5%, and the laser output is 49.6W / m 2 .

[0083] When the spectral splitting system of this scheme is used to separate the 430nm-470nm and 700nm-820nm bands to pump the same medium, the heat load generated is 203W / m 2 , the power generation efficiency is 19%. It can be seen that when the heat is reduced to about half, the impact on the power generation efficiency is only (2.5% / 21.5%=0.116), and this greatly reduced heat originally requires a lot of electricity to drive the cooling water for heat dissipation, which not only maintains the stable operation of the laser, but also saves electricity consumption.

[0084] Example 8

[0085] The difference between this embodiment and embodiment 2 is that the gain medium is changed to Ce:Nd:YAG transparent laser ceramics. 3+ and Nd 3+ The doping concentrations are 0.1% and 1.1% atomic percentage respectively.

[0086] The samples in this embodiment are subjected to a solar irradiance of 1000 W / m 2 In case:

[0087] When Ce:Nd:YAG is pumped in the full band, the heat load generated is 452W / m 2 The battery power generation efficiency is 20.8%, and the laser output is 52.1W / m 2 .

[0088] When the spectral splitting system of this scheme is used to separate the 430nm-470nm and 700nm-820nm bands to pump the same medium, the heat load generated is 213W / m 2 , power generation efficiency is 18.8%, laser output is 49.18W / m 2 It can be seen that when the heat is reduced to about one-half, the impact on power generation efficiency is only (2% / 20.8%=0.096). However, this greatly reduced heat originally requires a lot of electricity to drive the cooling water for heat dissipation, which not only maintains the stable operation of the laser, but also saves electricity consumption.

[0089] Example 9

[0090] The difference between this embodiment and embodiment 1 is that the dichroic mirror coating uses zirconium oxide (high refractive index, refractive index n = 2.1) and magnesium fluoride (low refractive index, refractive index n = 1.38) as a multilayer interference film with high and low refractive index materials alternately stacked. The physical thickness of ZrO2 is about 90.5nm, and the physical thickness of MgF2 is about 137.7nm. 14 pairs (28 layers in total) are alternately stacked, which can achieve a reflectivity of > 98% in the 700nm-820nm band, and a transmittance of > 90% in other bands. A layer of SiO2 protective film (thickness 100nm) is covered on the outer layer to improve tolerance, thereby maintaining stable operation, and the complete film system structure becomes [(HL) 14 +P].

[0091] The samples in this embodiment are subjected to a solar irradiance of 1000 W / m 2 In the case of full-band pumping of Nd:YAG, the heat load generated is 368W / m 2 , the battery power generation efficiency is 23%, and the laser output is about 35W / m 2 .

[0092] When the 700nm-820nm band is separated by the optical splitting system of this scheme to pump the same medium, the heat load generated is 123W / m 2 , the power generation efficiency is 20.8%. It can be seen that when the heat is reduced to one third, the impact on the power generation efficiency is only (2.2% / 23%=0.096), and this greatly reduced heat originally requires a lot of electricity to drive the cooling water for heat dissipation, which not only maintains the stable operation of the laser, but also saves electricity consumption.

[0093] Example 10

[0094] The difference between this embodiment and embodiment 2 is that: the dichroic mirror coating adopts zirconium oxide (high refractive index, refractive index n = 2.1) and magnesium fluoride (low refractive index, refractive index n = 1.38) as a multilayer interference film with high and low refractive index materials alternately stacked, then within the range of 430nm-470nm, 11 pairs (22 layers) of Bragg reflectors with a central wavelength of 450nm are designed, the layer thickness of ZrO2 is about 53.6nm, and the layer thickness of MgF2 is about 81.5nm; within the range of 700nm-820nm, 14 pairs (28 layers) of Bragg reflectors with a central wavelength of 760nm are designed, the layer thickness of ZrO2 is about 90.5nm, and the layer thickness of MgF2 is about 137.7nm. In addition, a SiO2 anti-reflection layer with an optical thickness of λ / 2 (physical thickness of about 138nm) is added on the top of the film system to optimize the transmission performance of the 470nm-700nm and >820nm bands. The complete film system structure is [(HL) 11 +(HL) 14+L], achieving a pump light reflectivity of >98% and a non-pump light transmittance of >90%.

[0095] When Ce:Nd:YAG is pumped in the full band, the heat load generated is 414W / m 2 , the battery power generation efficiency is 22%, and the laser output is about 45W / m 2

[0096] When the spectral splitting system of this scheme is used to separate the 430nm-470nm and 700nm-820nm bands to pump the same medium, the heat load generated is 195W / m 2 , power generation efficiency is 19.2%, laser output is about 42.9W / m 2 It can be seen that when the heat is reduced to about one-half, the impact on power generation efficiency is only (2.8% / 22%=0.127). Similarly, the reduced heat originally requires very high electrical energy to drive cooling water for heat dissipation, which not only maintains the stable operation of the laser, but also saves electricity consumption.

[0097] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0098] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A laser system, comprising a sunlight automatic tracking and focusing device, a solar cell device and a laser device having a laser resonant cavity, wherein the laser resonant cavity comprises laser ceramics, characterized in that: The laser ceramic is provided with a gain medium and also includes a light splitting device, which is used to receive a light beam from the sunlight automatic tracking and focusing device and split the light beam into light beams of different wavelength bands: A pump gain beam is guided to directly irradiate the gain medium of the laser ceramic to generate laser light by stimulated emission; The non-pump beam is a solar cell device with a photovoltaic panel array to generate photovoltaic power.

2. The laser system according to claim 1, characterized in that The laser ceramic is selected from: Nd:YAG, Ce:Nd:YAG, Ce:Cr:Nd:YAG.

3. The laser system according to claim 1, characterized in that The light splitting device is one or a combination of the following: a dichroic mirror with a coating, a grating, and a prism.

4. The laser system according to claim 3, characterized in that The selection of the pump gain beam by the optical splitting device satisfies any of the following: When the gain medium is Nd:YAG, the wavelength range of the pump gain beam meets the following requirements: 700nm-820nm; When the gain medium is Ce, Nd: YAG, the wavelength range of the pump gain beam meets: 430nm-470nm and 700nm-820nm.

5. The laser system according to claim 3, characterized in that The coating of the dichroic mirror includes a high-reflection film matched to the pump gain beam, and the high-reflection film is used for the pump gain beam to pump the gain medium; and / or An anti-reflection film matched to the non-pump light beam, the anti-reflection film is used for the non-pump light beam to be used for solar photovoltaic panel array power generation after being transmitted by the dichroic mirror.

6. The laser system according to claim 4, characterized in that The Nd doping amount in the gain medium Nd:YAG is 1.0-1.1 at.%.

7. The laser system according to claim 4, characterized in that The doping amounts of Ce and Nd in the gain medium Ce:Nd:YAG are 0.05-0.1 at. % and 1.0-1.1 at. % respectively.

8. The laser system according to claim 1, characterized in that The high-reflection film and / or anti-reflection film in the coating is a composite film formed by alternating coatings of a high-refractive-index material and coatings of a low-refractive-index material.

9. A device comprising a main body and a laser system according to any one of claims 1 to 9 arranged in the main body.

Images