CN106532418B - Solar panel driven low threshold Nd: YAG laser - Google Patents

Solar panel driven low threshold Nd: YAG laser Download PDF

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Publication number
CN106532418B
CN106532418B CN201611147436.9A CN201611147436A CN106532418B CN 106532418 B CN106532418 B CN 106532418B CN 201611147436 A CN201611147436 A CN 201611147436A CN 106532418 B CN106532418 B CN 106532418B
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laser
light
solar panel
solar
sunlight
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CN106532418A (en
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令维军
夏涛
辛建元
董忠
刘勍
路飞平
赵小龙
李可
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Tianshui Normal University
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01SDEVICES 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
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09Processes or apparatus for excitation, e.g. pumping
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01SDEVICES 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
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/14Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
    • H01S3/16Solid materials
    • H01S3/163Solid materials characterised by a crystal matrix
    • H01S3/164Solid materials characterised by a crystal matrix garnet
    • H01S3/1643YAG

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Lasers (AREA)

Abstract

The invention discloses a solar panel driven low threshold Nd: YAG laser, provided with: solar photovoltaic power generation system and low threshold Nd: YAG laser. The invention adopts the solar cell panel to supply power for the laser, so that the laser can work in an environment without alternating current commercial power by utilizing solar energy, the resonant cavity of the laser is a two-mirror cavity, the cavity type is simple and easy to adjust, the light-emitting threshold value is very low, a water cooling system is not needed, the cost is low, the laser can directly generate electricity through sunlight, and the laser can simulate the sunlight to generate electricity through the halogen tungsten lamp array in a laboratory with insufficient illumination, thereby meeting the teaching requirements of the laboratory and being beneficial to popularization of relevant knowledge of the laser. The solar energy is utilized to work, so that the regional limit of laser application is effectively solved, the sustainable development environment-friendly concept advocated by the nation is responded, and the solar energy laser has important significance.

Description

Solar panel driven low threshold Nd: YAG laser
Technical Field
The invention relates to the technical field of photovoltaic technology and laser technology, in particular to a solar panel driven low threshold Nd: YAG laser.
Background
In recent years, laser technology has been unprecedented, and laser applications in six fields of industry, medical treatment, commerce, scientific research, information, and military have increased. The power supply system is a heart of the laser, and the common laser pumping source adopts indoor alternating current for power supply, so that the working range of the laser is greatly limited due to the design, and the power supply system of the laser is particularly difficult especially in the field, such as gobi desert, desert and other unmanned areas with severe environments. As solar photovoltaic technology is mature gradually, and as the earth resources are becoming increasingly poor, solar energy is becoming more and more important as a new energy source which is safe, pollution-free, free of air exhaust emission and sustainable. In universities, laser related teaching is more and more focused and valued by teachers, and the laser is high in adjustment difficulty due to high cost, is generally only used for related scientific research, is far away from basic experiments of college students, so that the laser experiments which can be contacted by the college students are fewer, mystery of the laser in the students is intangibly increased, the students are prevented from knowing the laser, and the development of the laser is retarded.
In summary, the working range of the existing laser is greatly limited, and in the aspect of teaching, the laser has high adjustment difficulty due to high cost, so that a certain distance is generated between the laser and a common student, and the development of the laser is retarded.
Disclosure of Invention
The invention aims to provide a solar panel driven low threshold Nd: YAG laser, it is low to aim at solving current laser and receive alternating current restriction's problem in power supply mode and scope, laser light threshold value, easy operation, low cost to this laser instrument can be directly through solar power generation, also can simulate solar light through halogen tungsten lamp array in the laboratory that illumination is not enough and generate electricity, satisfies mr's teaching and student's experiment's demand.
The invention provides a solar panel driven low threshold Nd: YAG laser, adopt rated output value for 50W/18V monocrystalline silicon solar cell panel as the electric energy source, utilize the wire to connect the output of solar cell panel to solar charging control module's input, again on being connected to 10Ah/12V solar special colloid battery and DCDC power module input through the wire with solar charging control module's output, the nominal voltage of DCDC power module output is connected to the drive circuit board of laser LD pumping source through the wire, provide stable electric energy source for the laser, make the laser can work in the environment that does not have alternating current commercial power, thereby effectively solved the regional restriction of laser application, and responded the sustainable development's of state advocate environmental protection theory. Continuous light of 808nm/2W is then generated by the LD pump source and focused by a collimating, focusing lens onto Nd: in YAG laser crystal, a straight concave pumping mirror and a plane output mirror form a linear two-stage cavity, and 1064nm near infrared laser is output by adjusting each element in a light path. And (3) frequency doubling is carried out on 1064nm light through KTP crystals to obtain 532nm visible green light.
Further, when the sunlight is sufficient, the solar panel is fixed on the solar panel frame, and the solar panel frame is adjusted to achieve the strongest sunlight. When in a room, the solar panel is placed under the halogen tungsten lamp array, and light emitted by the halogen tungsten lamp replaces sunlight to provide light energy for the solar panel. The solar charging controller, the storage battery and the DCDC power supply module are packaged in the box together. The LD pumping laser optical fiber head is fixed on the two-dimensional adjustable mirror bracket through the flange plate, and the collimating lens, the focusing lens, the plano-concave pumping mirror and the plane output mirror are fixed on the two-dimensional adjustable mirror bracket. The two-dimensional adjustable mirror holder is fixed on the slipway through branch and sleeve, through the height of each component of branch adjustable, nd: YAG laser crystal and KTP double frequency crystal are fixed on the slip table through platform connection branch and sleeve of 25 x 20 x 5mm (length x width x height), and the slip table is adorned on accurate slide rail, can adjust the distance between each component through the back-and-forth sliding.
The invention provides a solar panel driven low threshold Nd: the YAG laser control system comprises a solar photovoltaic system and a low-threshold laser system; the solar photovoltaic system converts an alternating current mains supply system into a solar power supply system; the low threshold laser system is characterized by lowest international threshold, low cost and simple adjustment mode, and is especially suitable for teaching and student basic experiments.
The invention adopts the solar cell panel as an electric energy source, and supplies power to the laser through the electric energy storage and voltage conversion circuit, so that the laser can work in an environment without alternating current commercial power by utilizing solar energy, thereby effectively solving the regional limitation of the application of the laser, responding to the sustainable development environment-friendly concept advocated by the nation and having important significance. The invention discloses a YAG laser with a low threshold value Nd driven by a solar cell panel, which is used for laser related teaching, student experiments, new energy utilization and other aspects; the laser does not need a water cooling system, the cavity type is simple and easy to adjust, the light-emitting threshold value is low, the cost is low, invisible 1064nm light can be converted into visible 532nm visible green light through the frequency doubling crystal, and the experimental phenomenon is more obvious and interesting. The laser can directly generate electricity through sunlight, and can simulate the sunlight to generate electricity through the halogen tungsten lamp array in a laboratory with insufficient illumination, so that the teaching requirements of teachers and the hands-on requirements of students are met, and the popularization of the related knowledge of the laser is facilitated. Aiming at low threshold value, high efficiency, simple cavity type, easy adjustment, no water cooling system, low cost and safety, the invisible 1064nm light can be converted into visible 532nm visible green light through the frequency doubling crystal, so that the experimental phenomenon is more obvious and interesting. The laser can directly generate electricity through sunlight, and can simulate the sunlight to generate electricity in a laboratory with insufficient illumination through a halogen tungsten lamp array; meanwhile, a simple and practical technology is provided for solving the regional limitation of laser application and responding to the sustainable development environment-friendly concept advocated by the nation.
Drawings
Fig. 1 is a graph showing a low threshold Nd of solar panel driving according to an embodiment of the present invention: YAG laser device frame diagram.
Fig. 2 is a graph of a solar-driven low threshold Nd provided by an embodiment of the present invention: YAG laser principle frame diagram.
Fig. 3 is a schematic diagram of a low threshold Nd for a halogen lamp array according to an embodiment of the present invention instead of solar light driving: YAG laser principle frame diagram.
Fig. 4 is a schematic diagram of a solar driving circuit module according to an embodiment of the invention.
Fig. 5 is a schematic diagram showing a halogen tungsten lamp array according to an embodiment of the present invention instead of a solar light driving circuit module.
In fig. 1: 1. a halogen tungsten lamp array; 2. a solar cell panel; 3. a fan; 4. a solar charge controller; 5. a storage battery; 6. a DCDC power module; 7. a wire; 8. an LD pump source; 9. a collimating lens; 10. a focusing lens; 11. a plano-concave pumping mirror; 12. nd: YAG laser crystal; 13. a planar output mirror; 14. KTP frequency doubling crystals.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The structure of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the low threshold Nd of the solar panel driving according to the embodiment of the present invention: the YAG laser includes: solar photovoltaic power generation system: the solar panel is used for generating electric energy; the halogen tungsten lamp array is used for replacing sunlight to charge the solar cell panel in a room without sunlight and is mainly used for experiments and teaching; a fan for cooling the halogen tungsten lamp; the charging controller ensures that the storage battery works in an optimal state, and greatly prolongs the service life of the storage battery; the storage battery is used for storing and releasing electric energy generated by the solar panel; and the DCDC power supply module is used for converting unstable direct current electric energy generated by the solar photovoltaic system into stable direct current electric energy required by the LD pumping source of the laser. Low threshold Nd: YAG laser system: the laser comprises a pumping source, a collimating mirror, a focusing mirror, a plano-concave pumping mirror, a laser crystal, a plane output coupling mirror and a KTP frequency doubling crystal.
The specific parameters of the elements are as follows: the solar cell panel is 50W/18V output monocrystalline silicon, the dimension is 530 x 350 x 22mm, the normal working voltage is 17.2V, the working current is 1.16A, the open-circuit voltage can reach 22.2V, the short-circuit current is 1.24A, and the conversion efficiency is 18%. The solar charging controller can automatically identify 12V or 24V, and the charging current and the load current can reach 10A, and has the functions of overload protection, output short-circuit protection and the like. The storage battery is a solar special colloid storage battery with the voltage of 10Ah/12V, the charging voltage of the storage battery cannot exceed 24V and the discharging voltage cannot be lower than 8V in practical application, and the storage battery can be continuously used for 3 hours when the storage battery is full of the power under the power requirement of the system, and the output voltage is not lower than 8V. The input voltage range of the DCDC power supply module is direct current 5V-30V, the output voltage is 1.25V-28V and is adjustable, under the condition of 5V voltage output, the maximum output current can reach 8A, the efficiency can reach 91%, the requirement of 5V/4A/20W of the maximum power of the laser is met, and the direct current power supply module has overload, overvoltage, short circuit and undervoltage protection. The power supply voltage range of the LD laser driving circuit board is as follows: 4.5V-5.5V, and the current is 4A at the maximum power. The focal length of the collimating lens is 50mm, and the focal length of the focusing lens is 100mm; the concave curvature radius of the plano-concave pumping mirror is 150mm. The pumping source is a semiconductor laser with 808nm wavelength optical fiber coupling output, and the pumping power is 2W at most. The plano-concave pumping mirror has high transmittance of more than 95% for 808nm light and high reflection of more than 99.8% for 1064nm light. Nd: YAG laser crystal size is 4 x 5mm, nd doping is 1.1%. The transmittance of the plane output mirror to 1064nm light is 5. The KTP double frequency crystal size is 4×4×5mm.
The specific installation requirements are as follows: when the sunlight is sufficient, the solar panel is fixed on the solar panel rack, and when the solar panel is indoor, the solar panel is placed under the halogen tungsten lamp array. The solar charging controller, the storage battery, the DCDC power supply module and the LD laser driving circuit board are packaged in a box together. The LD pumping laser optical fiber head is fixed on the two-dimensional adjustable mirror bracket through the flange plate, and the collimating lens, the focusing lens, the plano-concave pumping mirror and the plane output mirror are fixed on the two-dimensional adjustable mirror bracket. The two-dimensional adjustable mirror holder is fixed on the slipway through branch and sleeve, through the height of each component of branch adjustable, nd: YAG laser crystal and KTP double frequency crystal are fixed on the slip table through platform connection branch and sleeve of 25 x 20 x 5mm (length x width x height), and the slip table is adorned on accurate slide rail, can adjust the distance between each component through the back-and-forth sliding.
The specific adjustment is as follows: the method is characterized in that a monocrystalline silicon solar cell panel with a rated output value of 50W/18V is used as an electric energy source, a solar charge controller is used for charging a 10Ah/12V solar special colloid storage battery, the solar special colloid storage battery is converted into a required 5V power supply through a DCDC power supply module and an LD laser driving circuit board, required electric power is provided for an LD pumping source, the monocrystalline silicon solar cell panel belongs to a circuit self control module, and a switch is only required to be turned on during operation. Continuous light of 808nm/2W is then generated by the LD pump source, the beam is collimated by a collimating lens, and then 808nm pump light is focused by a focusing lens to Nd: YAG laser crystal center, the distance between the laser crystal center and the focusing lens is about 100mm, the plano-concave pumping mirror and the plane output mirror form a linear two-border cavity, the distance between the two mirrors is about 60mm, the laser crystal is placed near the center of the two mirror cavities, and each element in the optical path is carefully regulated so as to output 1064nm near infrared laser. And (3) frequency doubling is carried out on 1064nm light through KTP crystals to obtain 532nm visible green light.
The principle of application of the present invention will be described in detail with reference to specific embodiments.
Example 1 of the present invention as shown in fig. 2, a solar cell panel 2, a solar charge controller 4, a storage battery 5, a DCDC power module 6, a lead 7, an LD pump source 8, a collimator lens 9, a focusing lens 10, a plano-concave pump mirror 11, nd: YAG laser crystal 12, plane output mirror 13, KTP double frequency crystal 14 constitute solar cell panel driven low threshold Nd that solar light shined: YAG laser. The solar energy is used for supplying power to the solar cell panel through sunlight, the storage battery is charged through the solar charging controller, and the storage battery is converted into a required 5V power supply through the DCDC power supply module and the LD laser driving circuit board, so that the required electric power is provided for the LD pumping source. Then, the LD pump source generates 808nm/2W continuous light, the pumping mode is end-face pumping, and the continuous light is focused to Nd: in YAG laser crystal, a straight concave pumping mirror and a plane output mirror form a linear two-stage cavity, and 1064nm near infrared laser is output by adjusting each element in a light path. And (3) frequency doubling is carried out on 1064nm light through KTP crystals to obtain 532nm visible green light.
In the test, the solar panel with the power of 50W/18V is irradiated by sunlight, and when the illumination from 12 pm to 4 pm in Qin district of Tianshui is sufficient, the maximum output power can reach 35W, the current is 2.3A, and the voltage is 15V. The LD pump source is powered by the circuit module, the output threshold of the laser to 1064nm light is 400mW measured by carefully adjusting the optical path, the oblique efficiency relative to the input pump is 29.65%, and the highest pumping power of 2W outputs 475mW laser. Through KTP crystal frequency multiplication, 532nm visible green light with 385mW can be obtained at most, the light-light conversion efficiency is 76%, under the condition of no illumination, the fully charged storage battery can ensure that the laser works normally for about 3 hours, and the laser has stable power and good performance during the period.
Example 2:
Example 2 of the present invention as shown in fig. 5, a halogen tungsten lamp array, a fan, a solar panel 1, a solar panel frame 2, a circuit module 3, a wire 4, an LD pump source 5, a collimator lens 6, a focusing lens 7, a plano-concave pump mirror 8, nd: YAG laser crystal 9, plane output mirror 10, KTP double frequency crystal 11 constitute the low threshold Nd that the solar cell panel that the halogen tungsten lamp array shines driven: YAG laser. The solar panel was powered by a halogen tungsten lamp array instead of sunlight, and the other steps followed the adjustment method in example 1 gave 1064nm of invisible light and a multiple of 532nm of visible green light.
The wavelength of the single crystal silicon solar cell panel with highest light absorption efficiency is 950nm, the effective range is 300nm-1100nm, the wavelength of the halogen tungsten lamp with the largest light emission spectrum efficiency is 1000nm, the effective range is 500-2500 nm, and the light energy absorption efficiency is better and higher than that of a xenon lamp and a halogen lamp compared with the light energy absorption efficiency of the single crystal silicon solar cell panel. The halogen tungsten lamp array is composed of 9 halogen tungsten lamps, and is arranged in a mode of 3 rows and 3 columns, the irradiation area is 500mm, and the requirements of light energy required by the solar cell panel are satisfied.
In the test, an array formed by 9 halogen tungsten lamps irradiates a 20W/18V solar panel, the solar panel is placed under the array formed by 9 halogen tungsten lamps, the maximum output power can reach 14W, the current is 1A, the voltage is 14V, a high-power cooling fan is designed to prevent the damage caused by overhigh temperature of the panel, the halogen tungsten lamps and the cooling fan are powered by 220V alternating current commercial power, the wind speed of the fan is adjustable, the maximum sufficient heat dissipation is generally adjusted, and the 20W/18V solar panel is required to be placed under the halogen tungsten lamps. The LD pump source is powered by the circuit module, the output threshold of the laser to 1064nm light is 400mW measured by carefully adjusting the optical path, the oblique efficiency relative to the input pump is 29.65%, and the highest pumping power of 2W outputs 475mW laser. Through KTP crystal frequency multiplication, 532nm visible green light with 385mW can be obtained at most, the light-light conversion efficiency is 76%, under the condition of no illumination, the fully charged storage battery can ensure that the laser works normally for about 3 hours, and the laser has stable power and good performance during the period.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.

Claims (4)

1. The solar panel-driven low-threshold Nd: YAG laser is characterized in that the solar panel-driven low-threshold Nd: YAG laser comprises:
a halogen tungsten lamp array for replacing sunlight and a fan for cooling the halogen tungsten lamp;
a solar cell panel for generating electric energy;
The solar panel frame is used for fixing the solar panel, and the solar panel frame is adjusted to enable the sunlight received by the solar panel to be strongest;
The solar charging controller is used for ensuring that the storage battery works in an optimal state and prolonging the service life of the storage battery;
a storage battery for storing and discharging electric energy generated by the solar panel;
the DCDC power supply module is used for converting unstable direct current electric energy generated by the solar photovoltaic system into stable direct current electric energy required by the LD pumping source of the laser;
an LD pump source for generating laser with wavelength of 808 nm;
A collimating mirror and a focusing lens system for high transmission of 808nm pump light and focusing the pump light into the crystal;
A plano-concave pumping mirror for high transmittance at 808nm and high reflection at 1064 nm;
YAG laser crystal with high parallelism and monochromaticity for converting the energy provided by LD pump source into coherent laser in space and time through optical resonant cavity;
A planar output mirror for outputting a 1064nm light portion, coated with a dielectric film having a light transmittance of 5% for 1064nm and a light reflectance of greater than 99.9% for 808 nm;
KTP crystal for doubling 1064nm invisible light to 532nm visible green light;
The LD pumping source is a semiconductor laser with 808nm wavelength optical fiber coupling output, and the pumping power is 2W at most; the focal length of the collimating lens is 50mm, and the focal length of the focusing lens is 100mm; the concave curvature radius R=150mm of the plano-concave pumping mirror is plated with a dielectric film with high transmittance to 808nm light, transmittance more than 95%, high reflection to 1064nm light and reflectivity more than 99.8%; the plane output mirror is plated with a dielectric film having a transmittance of 5% for 1064nm light.
2. The solar panel driven low threshold Nd: YAG laser of claim 1 wherein the laser is powered directly by sunlight for an outdoor exposure to sufficient sunlight and powered by a tungsten halogen array instead of sunlight for an indoor exposure to insufficient sunlight.
3. The solar panel-driven low threshold Nd: YAG laser of claim 1, wherein the 50W/18V output single crystal silicon solar panel is used, the tungsten halogen lamp array is composed of 9 tungsten halogen lamps, and the tungsten halogen lamps are arranged in 3 rows and 3 columns, and the effective irradiation area is 500 x 500mm.
4. A solar panel-driven low threshold Nd: YAG laser as claimed in claim 1, the laser crystal being a Nd: YAG crystal having a size of 4 x 5mm and a Nd doping of 1.1%; the frequency doubling crystal is KTP crystal, the size is 4 x 5mm, and the light-light conversion efficiency is 76%.
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CN107275922A (en) * 2017-06-21 2017-10-20 天水师范学院 A kind of power-supply system based on solar panels driving semiconductor laser
CN113363798B (en) * 2021-05-20 2022-09-23 厦门大学 Adjustable high-optical-efficiency broadband multi-longitudinal-mode Raman microchip laser

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