Laser for realizing wide-temperature adaptive enhancement based on temperature regulation and control of pumping angle

Abstract

The invention belongs to the technical field of solid lasers, and particularly relates to a laser for realizing wide-temperature adaptive enhancement based on a temperature regulation and control pumping angle, which comprises a differential heat sink system, an LD array pump, a focusing coupling system, an input mirror, a temperature regulation and control gain crystal system and an output mirror which are sequentially arranged from left to right, and a temperature regulation feedback line, a temperature feedback line and an intelligent central processing system, wherein the differential heat sink system and the temperature regulation gain crystal system are connected with the intelligent central processing system through the temperature regulation feedback line and the temperature feedback line respectively. The differential heat sink system, the temperature control gain crystal system and the intelligent central processing system are organically combined, laser gain optimization in a wide temperature range is achieved by dynamically adjusting the pumping angle and compensating the thermal focal length, and the problem of gain loss caused by the thermal lens effect during long-time work of the laser is effectively solved. The device is simple in structure, and has the characteristics of high efficiency and self-adaption.

Description

Technical Field

[0001] The present invention relates to the technical field of solid-state lasers, and particularly to a laser with wide-temperature self-adaptive enhancement achieved by temperature-controlled pumping angle. Background Art

[0002] LD array pumping is mainly divided into two methods: side pumping and end pumping, and has been widely used in fields such as high-power and high-energy lasers. Compared with side array pumping, end pumping has excellent beam quality and high stability. Especially in the field of solid-state lasers, for crystals with a smaller stimulated emission cross-section or more serious thermal effects, it shows higher gain characteristics. Therefore, this technology has become an important research direction in fields such as ultra-precision cold processing and strong-field physics.

[0003] However, under the condition of long-term operation of LD end array pumping, during the electro-optical conversion process of each LD, part of the energy will be converted into heat energy and conducted to the surrounding of the LD housing, resulting in a relatively high temperature rise, thus causing problems such as an increase in the LD threshold current density and spot distortion. In addition, under long-term working conditions, the gain medium excited by end pumping generates a thermal lens effect due to heat accumulation. Affected by the above problems, the crystal gain effect is reduced, further reducing the output performance of the laser, and thus it is difficult to achieve efficient laser output. Summary of the Invention

[0004] (I) Technical Problems to be Solved

[0005] Aiming at the deficiencies of the prior art, the present invention provides a laser with wide-temperature self-adaptive enhancement achieved by temperature-controlled pumping angle, and solves the problems raised in the above background art.

[0006] (II) Technical Solutions

[0007] The present invention specifically adopts the following technical solutions to achieve the above objectives:

[0008] A laser with wide-temperature self-adaptive enhancement achieved by temperature-controlled pumping angle, comprising a differential heat sink system, an LD array pump, a focusing and coupling system, an input mirror, a temperature-controlled gain crystal system, and an output mirror arranged in sequence from left to right, as well as a temperature-controlled feedback line, a temperature feedback line, and an intelligent central processing system. The differential heat sink system and the temperature-controlled gain crystal system are respectively connected to the intelligent central processing system through the temperature-controlled feedback line and the temperature feedback line;

[0009] The differential heat sink system includes an LD customized hole position, a circulating water-cooled heat dissipation unit, a first temperature feedback unit, a second temperature feedback unit, a first thermoelectric cooler temperature control unit, a second thermoelectric cooler temperature control unit, a thermal expansion unit, and a heat conduction unit. The LD array pump is placed in the LD customized hole position. There is a gap with a certain distance between the upper and lower end faces of the LD customized hole position and the LD array pump, ensuring that the thermal expansion material in the differential heat sink system has a certain expansion space. The thermal expansion unit and the heat conduction unit are respectively installed on the upper and lower end faces of the LD customized hole position. The circulating water-cooled heat dissipation unit is installed on the side surface of the differential heat sink system. The first temperature feedback unit, the second temperature feedback unit, the first thermoelectric cooler temperature control unit, and the second thermoelectric cooler temperature control unit are installed on the back of the differential heat sink system;

[0010] The temperature control gain crystal system includes a gain medium, a gain medium fixture, a temperature sensing unit, and a temperature control module. The gain medium is arranged on the surface of the gain medium fixture. The temperature sensing unit is arranged in the hole position on the side surface of the gain medium fixture. The gain medium fixture is arranged on the surface of the temperature control module.

[0011] Furthermore, the thermal expansion unit is used to compensate for the structural thermal strain through material expansion, improving the temperature adaptability of the system; the heat conduction unit is used to efficiently conduct heat under different temperature conditions; the first thermoelectric cooler temperature control unit and the second thermoelectric cooler temperature control unit are respectively used to adjust the temperature of the heat dissipation module to achieve bidirectional dynamic temperature compensation; the circulating water-cooled heat dissipation unit is used to quickly remove the excess heat generated during the operation of the first thermoelectric cooler temperature control unit and the second thermoelectric cooler temperature control unit; the first temperature feedback unit and the second temperature feedback unit are respectively used to monitor the temperature state of the differential heat sink system in real time and feedback / receive instructions from the intelligent central processing system; the gain medium fixture is used to fix the gain medium and provide a stable heat conduction process; the temperature sensing unit is used to monitor the temperature of the gain medium in real time and transmit the data to the intelligent central processing system; the temperature control module uses a thermoelectric cooler or a circulating water-cooled device to protect the gain medium from thermal damage.

[0012] Furthermore, the thermal expansion unit is made of shape memory alloy, vapor-grown carbon fiber-reinforced shape memory polyurethane foam, or multi-walled carbon nanotube / epoxy resin-based composite material to provide efficient thermal expansion compensation performance; the heat conduction unit is made of copper, aluminum nitride, or silicon nitride material to ensure high thermal conductivity and structural stability.

[0013] Further, the gain medium is made of Nd:YAG, Nd:YVO, Nd:GdVO or MgO:PPLN material, which is used to achieve high-efficiency gain at wide temperatures; an anti-pump light reflection film layer is coated on the surface of the gain medium to achieve high-efficiency optical gain. The pump light wavelengths emitted by the LD array pump correspond to different absorption characteristics of the gain medium, which are 813 nm, 808 nm, 880 nm, 879 nm or 1064 nm, so as to ensure an efficient gain process.

[0014] Further, the temperature control module adopts a thermoelectric cooler, a circulating water-cooled heat dissipation device or a temperature control furnace. The temperature control module is controlled by an intelligent central processing system, and adjusts the temperature control parameters according to the real-time feedback / received signal to compensate for the thermal focal length effect and gain of the gain medium.

[0015] Further, the circulating water-cooled heat dissipation unit is designed as a high-efficiency fluid channel structure to achieve large-area uniform heat dissipation through water-cooled circulation.

[0016] Further, the first temperature feedback unit and the second temperature feedback unit are communicatively connected to the intelligent central processing system through temperature sensors, and are used to dynamically regulate the operating states of the heat dissipation modules in the differential heat sink system.

[0017] Further, the intelligent central processing system includes a temperature data acquisition module, an algorithm control module and an instruction output module; the temperature data acquisition module is used to receive real-time data from the temperature sensing unit, the first temperature feedback unit and the second temperature feedback unit; the algorithm control module is used to calculate the thermal focal length change of the gain medium and the temperature difference state of the differential heat sink system; the instruction output module is used to send control instructions to the temperature control module and the differential heat sink system.

[0018] Further, the input mirror and the output mirror are respectively coated with a pump light total reflection film layer and a target laser antireflection film layer to improve the utilization rate of the pump light and the optical quality of the output laser.

[0019] (III) Beneficial effects

[0020] Compared with the prior art, the present invention provides a laser based on temperature-controlled pump angle to achieve wide-temperature self-adaptive enhancement, which has the following beneficial effects:

[0021] The present invention combines a differential heat sink system, a temperature-controlled gain crystal system and an intelligent central processing system. Through dynamically adjusting the pump angle and compensating the thermal focal length, the laser gain optimization within a wide temperature range is realized, effectively solving the problem of gain loss caused by the thermal lens effect during the long-term operation of the laser. Its structure is simple and has the characteristics of high efficiency and self-adaptation. Description of the drawings

[0022] Figure 1 It is the overall schematic diagram of the present invention;

[0023] Figure 2 It is the front view schematic diagram of the differential heat sink system;

[0024] Figure 3 It is the left view schematic diagram of the differential heat sink system;

[0025] Figure 4 It is the rear view schematic diagram of the differential heat sink system;

[0026] Figure 5 It is the sectional view schematic diagram of the differential heat sink system;

[0027] Figure 6 It is the position schematic diagram of the thermal expansion unit and the heat conduction unit;

[0028] Figure 7 It is the schematic diagram of the temperature control crystal gain system;

[0029] Figure 8 It is the judgment process of the intelligent central processing system;

[0030] Figure 9 It is the schematic diagram of the initial operating state of the laser with wide-temperature adaptive enhancement achieved by temperature control of the pump angle;

[0031] Figure 10 It is the schematic diagram of the operating state of the laser after regulation with wide-temperature adaptive enhancement achieved by temperature control of the pump angle.

[0032] In the figure: 1. Differential heat sink system; 2. LD array pump; 3. Focusing coupling system; 4. Input mirror; 5. Temperature control gain crystal system; 6. Output mirror; 7. Temperature control feedback line; 8. Temperature feedback line; 9. Intelligent central processing system; 10. LD customized hole position; 11. Circulating water-cooled heat dissipation unit; 12. First temperature feedback unit; 13. Second temperature feedback unit; 14. First semiconductor refrigeration sheet temperature control unit; 15. Second semiconductor refrigeration sheet temperature control unit; 16. Thermal expansion unit; 17. Heat conduction unit; 18. Gain medium; 19. Gain medium fixture; 20. Temperature sensing unit; 21. Temperature control module. Specific embodiments

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] Embodiment

[0035] As Figures 1-10 shown, a laser for realizing wide-temperature self-adaptive enhancement by regulating the pumping angle based on temperature in an embodiment of the present invention includes a differential heat sink system 1, an LD array pump 2, a focusing and coupling system 3, an input mirror 4, a temperature-regulating gain crystal system 5, and an output mirror 6, which are sequentially arranged from left to right, as well as a temperature-regulating feedback line 7, a temperature feedback line 8, and an intelligent central processing system 9. The differential heat sink system 1 and the temperature-regulating gain crystal system 5 are respectively connected to the intelligent central processing system 9 through the temperature-regulating feedback line 7 and the temperature feedback line 8;

[0036] The differential heat sink system 1 includes an LD customized hole position 10, a circulating water-cooled heat dissipation unit 11, a first temperature feedback unit 12, a second temperature feedback unit 13, a first semiconductor refrigeration sheet temperature-regulating unit 14, a second semiconductor refrigeration sheet temperature-regulating unit 15, a thermal expansion unit 16, and a heat conduction unit 17. The LD array pump 2 is placed in the LD customized hole position 10. There are gaps with a certain distance between the upper and lower end faces of the LD customized hole position 10 and the LD array pump 2, ensuring that the thermal expansion material in the differential heat sink system 1 has a certain expansion space. The thermal expansion unit 16 and the heat conduction unit 17 are respectively installed on the upper and lower end faces of the LD customized hole position 10. The circulating water-cooled heat dissipation unit 11 is installed on the side surface of the differential heat sink system 1. The first temperature feedback unit 12, the second temperature feedback unit 13, the first semiconductor refrigeration sheet temperature-regulating unit 14, and the second semiconductor refrigeration sheet temperature-regulating unit 15 are installed on the back surface of the differential heat sink system 1;

[0037] The temperature-regulating gain crystal system 5 includes a gain medium 18, a gain medium fixture 19, a temperature sensing unit 20, and a temperature-regulating module 21. The gain medium 18 is arranged on the surface of the gain medium fixture 19. The temperature sensing unit 20 is arranged in the hole positions on the side surface of the gain medium fixture 19. The gain medium fixture 19 is arranged on the surface of the temperature-regulating module 21.

[0038] In this embodiment, the thermal expansion unit 16 is used to compensate for the thermal strain of the structure through material expansion, improving the temperature adaptability of the system; the heat conduction unit 17 is used to efficiently conduct heat under different temperature conditions; the first thermoelectric cooler temperature control unit 14 and the second thermoelectric cooler temperature control unit 15 are respectively used to adjust the temperature of the heat dissipation module to achieve bidirectional dynamic temperature compensation; the circulating water-cooled heat dissipation unit 11 is used to quickly remove the excess heat generated during the operation of the first thermoelectric cooler temperature control unit 14 and the second thermoelectric cooler temperature control unit 15; the first temperature feedback unit 12 and the second temperature feedback unit 13 are respectively used to monitor the temperature state of the differential heat sink system 1 in real time and feedback / receive instructions from the intelligent central processing system 9; the gain medium fixture 19 is used to fix the gain medium 18 and provide a stable heat conduction process; the temperature sensing unit 20 is used to monitor the temperature of the gain medium 18 in real time and transmit the data to the intelligent central processing system 9; the temperature control module 21 uses a thermoelectric cooler or a circulating water-cooled device to protect the gain medium 18 from thermal damage.

[0039] In this embodiment, the thermal expansion unit 16 is made of shape memory alloy, vapor-grown carbon fiber-reinforced shape memory polyurethane foam or multi-walled carbon nanotube / epoxy resin-based composite material to provide efficient thermal expansion compensation performance; the heat conduction unit 17 is made of copper, aluminum nitride or silicon nitride material to ensure high thermal conductivity and structural stability.

[0040] In this embodiment, the gain medium 18 is made of Nd:YAG, Nd:YVO4, Nd:GdVO4 or MgO:PPLN material for achieving wide-temperature and high-efficiency gain; an anti-pump light reflection film layer is coated on the surface of the gain medium 18 for achieving efficient optical gain, and the pump light wavelengths emitted by the LD array pump 2 corresponding to the different absorption characteristics of the gain medium 18 are 813 nm, 808 nm, 880 nm, 879 nm or 1064 nm to ensure an efficient gain process.

[0041] In this embodiment, the temperature control module 21 uses a thermoelectric cooler, a circulating water-cooled heat dissipation device or a temperature control furnace. The temperature control module 21 is controlled by the intelligent central processing system 9 and adjusts the temperature control parameters according to the real-time feedback / received signal to compensate for the thermal focal length effect and gain of the gain medium 18.

[0042] In this embodiment, the circulating water-cooled heat dissipation unit 11 is designed as a high-efficiency fluid channel structure to achieve large-area uniform heat dissipation through water-cooled circulation.

[0043] In this embodiment, the first temperature feedback unit 12 and the second temperature feedback unit 13 are communicatively connected to the intelligent central processing system 9 through temperature sensors and are used to dynamically regulate the operating states of the respective heat dissipation modules in the differential heat sink system 1.

[0044] In this embodiment, the intelligent central processing system 9 includes a temperature data acquisition module, an algorithm control module, and an instruction output module; the temperature data acquisition module is used to receive the real-time data of the temperature sensing unit 20, the first temperature feedback unit 12, and the second temperature feedback unit 13; the algorithm control module is used to calculate the thermal focal length change of the gain medium 18 and the temperature difference state of the differential heat sink system 1; the instruction output module is used to send control instructions to the temperature regulation module 21 and the differential heat sink system 1.

[0045] In this embodiment, the input mirror 4 and the output mirror 6 are respectively coated with a pump light total reflection film layer and a target laser antireflection film layer to improve the utilization rate of the pump light and the optical quality of the output laser.

[0046] The regulation process of the laser with wide-temperature self-adaptive enhancement based on temperature regulation of the pump angle in the present invention is as follows: S1: The temperature sensing unit 20 in the temperature regulation gain crystal system 5 collects the temperature change of the gain medium 18 and transmits it to the intelligent central processing system 9 in real time through the temperature feedback line 8;

[0047] S2: The first temperature feedback unit 12 and the second temperature feedback unit 13 perform two-way communication with the intelligent central processing system 9 through the temperature regulation feedback line 7 to transmit the changing temperature of the differential heat sink system 1 in real time;

[0048] S3: The intelligent central processing system 9 judges the laser operation data fed back by the first temperature feedback unit 12, the second temperature feedback unit 13, and the temperature sensing unit 20. When the temperatures fed back by the first temperature feedback unit 12, the second temperature feedback unit 13, and the temperature sensing unit 20 are normal, the existing laser operating state is maintained; when the temperatures fed back by the first temperature feedback unit 12, the second temperature feedback unit 13, and the temperature sensing unit 20 are abnormal, the operating temperatures of the first semiconductor refrigeration temperature regulation unit 14 and the second semiconductor refrigeration temperature regulation unit 15 are regulated to cause the thermal expansion unit 16 to expand, and the operating angle of the LD array pump 2 is regulated to increase the gain of the gain medium 18, as Figure 8 shown;

[0049] S4: When the laser operation data is normal, the intelligent central processing system 9 regulates the first semiconductor refrigeration temperature regulation unit 14 and the second semiconductor refrigeration temperature regulation unit 15 in the differential heat sink system 1 to maintain the existing state, as Figure 9 shown;

[0050] S5: When there are abnormal feedbacks from the first temperature feedback unit 12, the second temperature feedback unit 13 and the temperature sensing unit 20, the intelligent central processing system 9 adjusts the temperatures of the first thermoelectric cooler temperature control unit 14 and the second thermoelectric cooler temperature control unit 15 in the differential heat sink system 1 in real time, and determines the tilting and / or downward tilting angles of the thermal expansion unit 16 through the first temperature feedback unit 12 and the second temperature feedback unit 13 to increase its gain effect, as Figure 10 shown.

[0051] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A laser that realizes wide-temperature self-adaptive enhancement based on temperature-regulated pumping angle, characterized in that: It includes a differential heat sink system (1), an LD array pump (2), a focusing coupling system (3), an input mirror (4), a temperature-controlled gain crystal system (5), and an output mirror (6) arranged in sequence from left to right, as well as a temperature-controlled feedback line (7), a temperature feedback line (8), and an intelligent central processing system (9). The differential heat sink system (1) and the temperature-controlled gain crystal system (5) are respectively connected to the intelligent central processing system (9) through the temperature-controlled feedback line (7) and the temperature feedback line (8); The differential heat sink system (1) includes an LD customized hole position (10), a circulating water-cooled heat dissipation unit (11), a first temperature feedback unit (12), a second temperature feedback unit (13), a first thermoelectric cooler temperature control unit (14), and a second thermoelectric cooler temperature control unit (15), a thermal expansion unit (16), and a heat conduction unit (17). The LD array pump (2) is placed in the LD customized hole position (10). There is a certain distance gap between the upper and lower end faces of the LD customized hole position (10) and the LD array pump (2), ensuring that the thermal expansion material in the differential heat sink system (1) has a certain expansion space. The thermal expansion unit (16) and the heat conduction unit (17) are respectively installed on the upper and lower end faces of the LD customized hole position (10). The circulating water-cooled heat dissipation unit (11) is installed on the side surface of the differential heat sink system (1). The first temperature feedback unit (12), the second temperature feedback unit (13), the first thermoelectric cooler temperature control unit (14), and the second thermoelectric cooler temperature control unit (15) are installed on the back surface of the differential heat sink system (1); The temperature-controlled gain crystal system (5) includes a gain medium (18), a gain medium fixture (19), a temperature sensing unit (20), and a temperature control module (21). The gain medium (18) is arranged on the surface of the gain medium fixture (19). The temperature sensing unit (20) is arranged in the hole positions on the side surface of the gain medium fixture (19). The gain medium fixture (19) is arranged on the surface of the temperature control module (21).

2. The laser for achieving wide-temperature self-adaptive enhancement based on temperature-regulated pumping angle according to claim 1, wherein: The thermal expansion unit (16) is used to compensate for the thermal strain of the structure through material expansion, improving the temperature adaptability of the system; the heat conduction unit (17) is used to efficiently conduct heat under different temperature conditions; the first thermoelectric cooler temperature control unit (14) and the second thermoelectric cooler temperature control unit (15) are respectively used to adjust the temperature of the heat dissipation module to achieve two-way dynamic temperature compensation; the circulating water-cooled heat dissipation unit (11) is used to quickly remove the excess heat generated during the operation of the first thermoelectric cooler temperature control unit (14) and the second thermoelectric cooler temperature control unit (15); the first temperature feedback unit (12) and the second temperature feedback unit (13) are respectively used to monitor the temperature state of the differential heat sink system (1) in real time and feed back / receive instructions from the intelligent central processing system (9); the gain medium fixture (19) is used to fix the gain medium (18) and provide a stable heat conduction process; the temperature sensing unit (20) is used to monitor the temperature of the gain medium (18) in real time and transmit the data to the intelligent central processing system (9); the temperature control module (21) uses a thermoelectric cooler or a circulating water-cooled device to protect the gain medium (18) from thermal damage.

3. The laser for achieving wide-temperature self-adaptive enhancement based on temperature-regulated pumping angle according to claim 1, wherein: The thermal expansion unit (16) is made of shape memory alloy, vapor-grown carbon fiber-reinforced shape memory polyurethane foam or multi-walled carbon nanotube / epoxy resin-based composite material to provide efficient thermal expansion compensation performance; the heat conduction unit (17) is made of copper, aluminum nitride or silicon nitride material to ensure high thermal conductivity and structural stability.

4. A laser that realizes wide-temperature self-adaptive enhancement based on temperature-regulated pumping angle according to claim 1, characterized in that: The gain medium (18) is made of Nd:YAG, Nd:YVO4, Nd:GdVO4 or MgO:PPLN material for achieving wide-temperature and high-efficiency gain; an anti-pump light reflection film layer is plated on the surface of the gain medium (18) for achieving efficient optical gain, and the pump light wavelengths emitted by the LD array pump (2) correspond to the different absorption characteristics of the gain medium (18) as 813 nm, 808 nm, 880 nm, 879 nm or 1064 nm to ensure an efficient gain process.

5. The laser for realizing wide-temperature self-adaptive enhancement based on temperature-regulated pumping angle according to claim 1, wherein: The temperature control module (21) uses a thermoelectric cooler, a circulating water-cooled heat dissipation device or a temperature control furnace, and the temperature control module (21) is controlled by the intelligent central processing system (9) to adjust the temperature control parameters according to the real-time feedback / received signal to compensate for the thermal focal length effect and gain of the gain medium (18).

6. The laser for achieving wide-temperature self-adaptive enhancement based on temperature-regulated pumping angle according to claim 1, wherein: The circulating water-cooled heat dissipation unit (11) is designed as a high-efficiency fluid channel structure to achieve large-area uniform heat dissipation through water-cooled circulation.

7. A laser for achieving wide-temperature self-adaptive enhancement based on temperature-regulated pumping angle according to claim 1, wherein: The first temperature feedback unit (12) and the second temperature feedback unit (13) are communicatively connected to the intelligent central processing system (9) through temperature sensors and are used to dynamically regulate the operating states of the heat dissipation modules in the differential heat sink system (1).

8. The laser for realizing wide-temperature self-adaptive enhancement by adjusting the pumping angle based on temperature according to claim 1, wherein: The intelligent central processing system (9) includes a temperature data acquisition module, an algorithm control module, and an instruction output module; the temperature data acquisition module is used to receive real-time data from the temperature sensing unit (20), the first temperature feedback unit (12), and the second temperature feedback unit (13); the algorithm control module is used to calculate the thermal focal length change of the gain medium (18) and the temperature difference state of the differential heat sink system (1); the instruction output module is used to send control instructions to the temperature regulation module (21) and the differential heat sink system (1).

9. The laser for realizing wide-temperature self-adaptive enhancement by regulating the pumping angle based on temperature according to claim 1, wherein: The input mirror (4) and the output mirror (6) are respectively coated with a pump light total reflection film layer and a target laser antireflection film layer to improve the utilization rate of pump light and the optical quality of the output laser.

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