CN109814317B - Nonlinear optical crystal temperature control and light path adjusting device - Google Patents
Nonlinear optical crystal temperature control and light path adjusting device Download PDFInfo
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- CN109814317B CN109814317B CN201811621108.7A CN201811621108A CN109814317B CN 109814317 B CN109814317 B CN 109814317B CN 201811621108 A CN201811621108 A CN 201811621108A CN 109814317 B CN109814317 B CN 109814317B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a nonlinear optical crystal temperature control and light path adjusting device, which comprises a light path adjusting part and a temperature control part. The light path adjusting part comprises a plurality of copper processing parts with good heat conductivity and a heat-insulating shell, the temperature control part comprises a TEC refrigerating sheet, a thermistor probe and a cooling fan, and the temperature control part also comprises a TEC temperature control special integrated chip which comprises a complete PID control algorithm, an A/D and D/A acquisition and output port, a PWM type TEC driving chip, a fan control interface, a communication interface with a man-machine interaction unit and the like; the man-machine interaction unit comprises a liquid crystal display panel, an operation key, an interface with the control unit and the like; the switch power supply supplies power to realize the conversion of commercial power into low-voltage direct current. The invention can realize the constant temperature control of 10-100 ℃ and the control precision of +/-0.1 ℃ on the built-in nonlinear crystal, and can realize the multi-dimensional adjustment of 360 ︒ rotation, up-down pitching, left-right pitching and translation of the propagation direction of the optical path of the nonlinear optical crystal in the optical path.
Description
Technical Field
The invention relates to the field of optical crystal control devices, in particular to a nonlinear optical crystal temperature control and light path adjusting device.
Background
The nonlinear optical crystal is a device which utilizes the effect of generating secondary or above nonlinear effect under the action of strong laser and strong external field to expand the wavelength and wavelength range of the existing laser, and can be used for frequency conversion technology such as frequency doubling, frequency mixing, parametric oscillation and optical parametric amplification. The nonlinear optical crystal is a functional material and has important application value in the technical field of laser. Widely used is KDP, KD P, CsH2A5O4(CDA)；KTiOPO4、KNbO3、NiNbO3、 Ba2NaNb5O15；BaB2O4(BBO)、LiB3O5(LBO)、NaNO2(ii) a GaAs, InSb, InAs, ZnS, etc.
The complexity and diversity of the internal structure of the nonlinear optical crystal, the tangential direction in the processing process, the error from a theoretical cutting surface and the like. The nonlinear optical crystal placed in the laser light path needs to be rotationally adjusted to tune the incident angle in addition to ensuring enough light passing surface.
The nonlinear optical crystal has various types and wide application. When nonlinear optical crystals are used for temperature matching and wavelength tuning, temperature regulation and thermostatic control of the temperature are required. When nonlinear optical crystals are used for non-temperature matching and wavelength tuning, the necessary temperature control of the crystal is also required to obtain optimal power conversion efficiency and to reduce thermal stress of the crystal. Therefore, a device is needed, which not only can perform temperature adjustment and thermostatic control on the nonlinear optical crystal, but also can perform angle adjustment of rotation, left-right pitching and up-down pitching on the crystal.
The constant temperature furnace is available in the market at present for controlling the temperature of the crystal, but the constant temperature furnace is large in size, is not easy to assemble in an optical path, and even if the constant temperature furnace can be assembled in the optical path, the constant temperature furnace also needs to be assembled in an optical adjusting frame because the angle can not be adjusted, so that the size and the weight of the device are further increased.
The invention aims to provide a nonlinear optical crystal temperature control and light path adjusting device to realize constant temperature control of a nonlinear optical crystal and realize multi-dimensional adjustment of level, pitch, rotation and the like in a light path so as to meet the requirement on the work of a laser.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
nonlinear optical crystal temperature control and light path adjusting device, its characterized in that: including light path adjustment part and temperature control part, wherein:
the light path adjusting part comprises an adjusting part base made of heat conducting materials and a heat-insulating shell made of heat insulating materials, a supporting seat is integrally formed on the adjusting part base, the heat-insulating shell is installed on one side of the supporting seat through a rotating shaft in a pitching rotating mode, a crystal clamping device is arranged in the heat-insulating shell and made of heat conducting materials, a nonlinear optical crystal is coaxially arranged in the crystal clamping device, the axial level of the nonlinear optical crystal and the axial level of the crystal clamping device are perpendicular to the axial direction of the rotating shaft connected with the heat-insulating shell, the nonlinear optical crystal rotates in the heat-insulating shell along with the crystal clamping device, the nonlinear optical crystal and the crystal clamping device integrally rotate in the pitching rotating mode along with the heat-insulating shell, light through holes are respectively formed in the side wall of the heat-insulating shell corresponding to the end portions of the nonlinear optical crystal, and a fixing hole vertically penetrating through the adjusting part base is further formed in the adjusting part base, one fixing hole is a round hole, and the other fixing hole is a waist-shaped hole;
the temperature control part comprises a switching power supply, a man-machine interaction unit, a small constant temperature control unit, a TEC temperature control special integrated chip, a thermistor probe, a TEC refrigerating sheet and a heat dissipation fan, wherein the heat dissipation fan is fixed on the other side of the supporting seat; the input end of the switch power supply is connected with commercial power, the output end of the switch power supply is respectively connected with power ends of the human-computer interaction unit and the small-sized constant temperature control unit, the commercial power is converted into working voltage of the human-computer interaction unit and the small-sized constant temperature control unit by the switch power supply and is supplied to the human-computer interaction unit and the small-sized constant temperature control unit, the human-computer interaction unit and the small-sized constant temperature control unit are connected through a communication interface, the TEC temperature control special integrated chip and the small-sized constant temperature control unit are integrated into a whole to be used as a central processing element of the small-sized constant temperature control unit, the small-sized constant temperature control unit is respectively electrically connected with the thermistor probe, the TEC refrigeration chip and the cooling fan, the small-sized constant temperature control unit receives electric signals of the thermistor probe and converts the electric signals into data to be sent to the TEC temperature control special integrated chip, the TEC temperature control special integrated chip contains a PID control algorithm, the acquired temperature data is compared with preset temperature data through the PID control algorithm and then outputs instruction data, the instruction data is converted into PWM signals by the small constant temperature control unit and then sent to the TEC refrigeration piece and the cooling fan, and PID control driving of the TEC refrigeration piece and the cooling fan is achieved.
The nonlinear optical crystal temperature control and light path adjusting device is characterized in that: the utility model discloses a heat preservation insulation support, including heat preservation insulation casing, supporting seat, pivot, TEC refrigeration piece and connection support seat, heat preservation insulation casing has a face opening, and heat preservation insulation casing open-ended one face lid closes to be connected with the switching piece, the switching piece is made by the heat conduction material, and the switching piece is connected the pivot is rotated through the pivot and is installed in the supporting seat and correspond the side, and it is gapped between crystal clamping device in the heat preservation insulation casing and the switching piece, is equipped with the PVC piece in the clearance in order to keep apart crystal clamping device and switching piece, constitutes the insulation can and seals the insulation can through the switching piece by heat preservation insulation casing and PVC piece, the TEC refrigeration piece is located the clearance between crystal clamping device and the switching piece, and the TEC refrigeration piece one side contacts with crystal clamping device, and the switching piece another side contacts with the switching piece, and refrigeration piece contacts the supporting seat through the switching piece.
The nonlinear optical crystal temperature control and light path adjusting device is characterized in that: the crystal clamping device comprises a crystal installation cylinder and a crystal clamping block, wherein the crystal installation cylinder is fixed in the heat-insulating shell, the axial direction of the crystal installation cylinder is horizontal to the axial direction of the rotating shaft, an installation through hole is formed in the crystal clamping block, the crystal clamping block is coaxially rotatably assembled in the crystal installation cylinder, and the nonlinear optical crystal is coaxially fixed in the crystal clamping block.
The nonlinear optical crystal temperature control and light path adjusting device is characterized in that: the crystal clamping block is internally provided with a deep hole, and the thermistor probe is inserted into the deep hole and is fully contacted with the crystal clamping block.
The nonlinear optical crystal temperature control and light path adjusting device is characterized in that: one side of the TEC refrigeration piece is embedded into the crystal installation cylinder and fully contacted with the crystal clamping block, and the other side of the TEC refrigeration piece is contacted with the switching block or fully contacted with the switching block after being embedded into the switching block.
The invention designs a constant temperature control technology based on TEC module and PWM regulation, and a miniaturized nonlinear optical crystal temperature control and light path regulation device based on an optical-mechanical-electrical integration mechanical structure, which can simultaneously meet the control requirements of nonlinear optical crystal temperature control and light path regulation.
The invention can realize the multi-dimensional adjustment of the non-linear optical crystal such as level, pitch, rotation and the like; the temperature control part comprises a small constant temperature control unit, a man-machine interaction unit and a switching power supply, and realizes the acquisition and control of temperature.
In the invention, a complete PID algorithm is adopted, and the TEC refrigeration pieces are controlled in two directions. And accurately calculating the current of the TEC according to the temperature difference. The current of the TEC is driven by PWM and LC continuous processing without an OFF stage, so that the temperature is continuously and stably ensured in a control period.
In the invention, the man-machine interaction unit is connected with the small-sized constant temperature control unit through the communication interface. The small-sized constant temperature control unit can memorize set data, can be separated from the human-computer interaction unit to work independently, can be controlled in real time, and can be connected with other control systems to realize data acquisition and control.
The invention has simple mechanical structure, small volume, large adjustment range and lower adjustment precision, but can meet the requirement of angle tuning of the nonlinear optical crystal.
The invention has the advantages of small volume, simple structure, low cost, high temperature control precision and wide temperature control range, and can be widely applied to the field of production and scientific research of frequency conversion of nonlinear optical crystals such as laser frequency doubling, difference frequency, sum frequency, OPO, OPA and the like.
Drawings
Fig. 1 is an isometric view of an optical path adjustment portion of the present invention.
Fig. 2 is a front view of the optical path adjusting part of the present invention.
Fig. 3 is a front sectional view of the optical path adjusting part of the present invention.
FIG. 4 is a schematic block diagram of the temperature control part of the present invention.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
As shown in fig. 1-4, the temperature control and optical path adjusting device for a nonlinear optical crystal includes an optical path adjusting part and a temperature control part, wherein:
the light path adjusting part comprises an adjusting part base 1 made of heat conducting materials and a heat insulation insulating shell 9 made of heat insulation materials, a supporting seat 10 is integrally formed on the adjusting part base 1, the heat insulation insulating shell 9 is installed on one side of the supporting seat 10 through a rotating shaft 11 in a pitching rotating mode, a crystal clamping device is arranged in the heat insulation insulating shell 9 and is made of heat conducting materials, a nonlinear optical crystal 6 is coaxially arranged in the crystal clamping device, the axial level of the nonlinear optical crystal 6 and the axial level of the crystal clamping device are perpendicular to the axial direction of the rotating shaft 11 connected with the heat insulation insulating shell 9, the nonlinear optical crystal 6 rotates in the heat insulation insulating shell 9 along with the crystal clamping device, the nonlinear optical crystal 6 and the crystal clamping device integrally rotate along with the heat insulation insulating shell 9 in the pitching rotating mode, light through holes are respectively formed in the side wall of the heat insulation insulating shell 9 and correspond to the end positions of the nonlinear optical crystal 6, the adjusting component base 1 is also provided with fixing holes 12 vertically penetrating through the adjusting component base 10, wherein one fixing hole is a round hole, and the other fixing hole is a kidney-shaped hole;
the temperature control part comprises a switching power supply 13, a man-machine interaction unit 14, a small constant temperature control unit 15, a TEC temperature control special integrated chip 16, a thermistor probe 7, a TEC refrigerating piece 3 and a heat dissipation fan 8, wherein the heat dissipation fan 8 is fixed on the other side of the supporting seat 10, the thermistor probe 7 is embedded into the crystal clamping device, one side of the TEC refrigerating piece 3 enters the heat insulation shell 9 to be contacted with the crystal clamping device, and the other side of the TEC refrigerating piece 3 is directly or indirectly contacted with the supporting seat 10; the input end of a switch power supply 13 is connected with commercial power, the output end of the switch power supply 13 is respectively connected with power ends of a man-machine interaction unit 14 and a small-sized constant temperature control unit 15, the commercial power is converted into working voltage of the man-machine interaction unit 14 and the small-sized constant temperature control unit 15 by the switch power supply 13 and is supplied to the man-machine interaction unit 14 and the small-sized constant temperature control unit 15, the man-machine interaction unit 14 is connected with the small-sized constant temperature control unit 15 through a communication interface 17, a TEC temperature control special integrated chip 16 and the small-sized constant temperature control unit 15 are integrated into a whole to be used as a central processing element of the small-sized constant temperature control unit 15, the small-sized constant temperature control unit 15 is respectively electrically connected with a thermistor probe 7, a TEC refrigerating sheet 3 and a cooling fan 8, the small-sized constant temperature control unit 15 receives electric signals of a thermistor probe 7 and converts the electric signals into data to be sent to the TEC temperature control special integrated chip 16, and the TEC temperature control special integrated chip 16 contains a PID control algorithm, the acquired temperature data is compared with preset temperature data through a PID control algorithm, and then instruction data is output, the instruction data is converted into PWM signals by the small constant temperature control unit 15 and then is sent to the TEC refrigerating piece 3 and the cooling fan 8, and PID control driving of the TEC refrigerating piece 3 and the cooling fan 8 is achieved.
The crystal clamping device comprises a crystal installation cylinder 4 and a crystal clamping block 5, wherein the crystal installation cylinder 4 is fixed in a heat-insulating shell 9, the axial direction of the crystal installation cylinder 4 is horizontal to the axial direction of a rotating shaft 11, an installation through hole is formed inside the crystal clamping block 5, the crystal clamping block 5 is coaxially assembled in the crystal installation cylinder 4 in a rotating mode, and a nonlinear optical crystal 6 is coaxially fixed in the crystal clamping block 5.
The crystal clamping block 5 is provided with a deep hole, and the thermistor probe 7 is inserted into the deep hole and is fully contacted with the crystal clamping block 5. One side of the TEC refrigeration piece 3 is embedded into the crystal installation cylinder 4 and fully contacts with the crystal clamping block 5, and the other side of the TEC refrigeration piece 3 contacts with the transfer block 2 or fully contacts with the transfer block 2 after being embedded into the transfer block 2.
As shown in fig. 4, the temperature control part of the invention comprises a switching power supply 13, a man-machine interaction unit 14, a communication interface 17, a small-sized constant temperature control unit 15, a thermistor probe 7, a TEC refrigeration plate 3, a TEC temperature control dedicated integrated chip 16, and a cooling fan 8.
The switching power supply 13 realizes the conversion of 220V alternating current into +5V direct current power supply of the man-machine interaction unit 14 and the small-sized constant temperature control unit 15.
The human-computer interaction unit 14 and the small-sized constant temperature control unit 15 are connected through a communication interface 17, and the communication interface 17 is a serial port, so that the issuing of instructions and the transmission of data are realized. The human-computer interaction unit 14 is a liquid crystal display module and a key switch, and can realize the setting of constant temperature and the setting of control precision.
The small-sized constant temperature control unit 15 is connected with the thermistor probe 7, the TEC refrigeration piece 3 and the cooling fan 8. The thermistor probe 7 is placed in the crystal block 5 in fig. 3, and the change in resistance of the thermistor probe 7 can be indicative of the temperature of the nonlinear optical crystal.
The TEC temperature control dedicated integrated chip 16 is a central processing element of the small-sized constant temperature control unit 15, and contains a complete PID control algorithm, and the temperature control precision can reach 0.01 ℃. The collected temperature is compared with the set temperature, an instruction is output through a complete PID control algorithm, the current of the TEC is driven by PWM and LC continuous processing, and the temperature is ensured to be continuous and stable in a control period.
The TEC refrigerating plate 3 is controlled in two directions, and heating and refrigerating modes can be realized. When in the refrigeration mode, the cooling fan 8 is started at the same time, and the refrigeration efficiency is improved. When the heating mode is in, the heat radiation fan 8 is turned off, and the heating efficiency is improved.
As shown in fig. 1-3, the optical path adjusting part includes an adjusting component base 1, a switching block 2, a TEC refrigerating plate 3, a crystal mounting cylinder 4, a crystal clamping block 5, a nonlinear optical crystal 6, a thermistor probe 7, a heat dissipation fan 8, and a heat insulation housing 9. The adjusting part base 1, the switching block 2, the crystal mounting cylinder 4 and the crystal clamping block 5 are all made of red copper materials, the heat conducting performance is good, the heat-insulating shell 9 is made of PVC or nylon materials, and the heat conducting performance is poor.
The nonlinear optical crystal 6 is wrapped by indium paper with good heat conductivity, clamped by a crystal clamping block 5 and placed in the crystal installation cylinder 4. The crystal clamping block 5 is a complete cylinder consisting of 2 symmetrical semi-cylinders, the interior of the cylinder is cut into the shape of the nonlinear optical crystal 6, the interior of the crystal mounting cylinder 4 is processed into a cylinder through hole, the inner diameter of the cylinder is matched with the outer diameter of the cylinder of the crystal clamping block 5, the crystal clamping block 5 can rotate in the crystal mounting cylinder 4 by 360 degrees, and therefore the nonlinear optical crystal 6 can freely rotate in a plane vertical to the optical axis.
A deep hole with the diameter of 2mm is formed in the body of the crystal clamping block 5, heat-conducting silicone grease is filled in the deep hole, the thermistor probe 7 is inserted into the deep hole, and the inlet of the deep hole is sealed by epoxy resin glue. The crystal clamp splice 5 adopts plastics screwed connection and fastening with the switching piece 2, places TEC refrigeration piece 3 between crystal clamp splice 5 and switching piece 2, and TEC refrigeration piece 3 both sides face all scribbles heat conduction silicone grease to fully contact with crystal clamp splice 5 and switching piece 2 respectively, have 2mm clearance between crystal clamp splice 5 and the switching piece 2, and keep apart with the PVC piece, can not realize heat transfer. And then covered with a heat-insulating housing 9. The PVC sheet and the heat insulation shell 9 form a heat insulation box.
One side of the connecting block 2 is provided with a cylindrical bulge which is used as a rotating shaft 11, a supporting seat 10 of the adjusting component base 1 is provided with a cylindrical through hole matched with the rotating shaft 11, and the connecting block 2 and all elements (the TEC refrigeration sheet 3, the crystal mounting cylinder 4, the crystal clamping block 5, the nonlinear optical crystal 6, the thermistor probe 7 and the heat-insulating shell 9) connected with the connecting block can rotate around the shaft center. Thereby realizing the pitch adjustment of the nonlinear optical crystal 6 in the optical path. And after the adjustment is finished, fastening the steel wire with screws.
The cooling fan 8 is installed to supporting seat 10 one side of adjusting part base 1, and adjusting part base 1's lower plane is connected and is fastened with optical platform with the screw, and adjusting part base 1 has 2 fixed orificess 12, and 1 hole is the round hole, and another hole is the waist hole, and adjusting part base 1 can suitably rotate round the round hole to realize the level adjustment of nonlinear optical crystal 6 in the light path. And after the adjustment is finished, fastening the steel wire with screws.
Claims (5)
1. Nonlinear optical crystal temperature control and light path adjusting device, its characterized in that: including light path adjustment part and temperature control part, wherein:
the light path adjusting part comprises an adjusting part base made of heat conducting materials and a heat-insulating shell made of heat insulating materials, a supporting seat is integrally formed on the adjusting part base, the heat-insulating shell is installed on one side of the supporting seat through a rotating shaft in a pitching rotating mode, a crystal clamping device is arranged in the heat-insulating shell and made of heat conducting materials, a nonlinear optical crystal is coaxially arranged in the crystal clamping device, the axial level of the nonlinear optical crystal and the axial level of the crystal clamping device are perpendicular to the axial direction of the rotating shaft connected with the heat-insulating shell, the nonlinear optical crystal rotates in the heat-insulating shell along with the crystal clamping device, the nonlinear optical crystal and the crystal clamping device integrally rotate in the pitching rotating mode along with the heat-insulating shell, light through holes are respectively formed in the side wall of the heat-insulating shell corresponding to the end portion of the nonlinear optical crystal, and a fixing hole vertically penetrating through the adjusting part base is further formed in the adjusting part base, one fixing hole is a round hole, and the other fixing hole is a waist-shaped hole;
the temperature control part comprises a switching power supply, a man-machine interaction unit, a small constant temperature control unit, a TEC temperature control special integrated chip, a thermistor probe, a TEC refrigerating sheet and a heat dissipation fan, wherein the heat dissipation fan is fixed on the other side of the supporting seat; the input end of the switch power supply is connected with commercial power, the output end of the switch power supply is respectively connected with power ends of the man-machine interaction unit and the small-sized constant temperature control unit, the commercial power is converted into working voltage of the man-machine interaction unit and the small-sized constant temperature control unit by the switch power supply and is supplied to the man-machine interaction unit and the small-sized constant temperature control unit, the man-machine interaction unit and the small-sized constant temperature control unit are connected through a communication interface, the TEC temperature control special integrated chip and the small-sized constant temperature control unit are integrated into a whole to be used as a central processing element of the small-sized constant temperature control unit, the small-sized constant temperature control unit is respectively electrically connected with the thermistor probe, the TEC refrigeration chip and the heat dissipation fan, the small-sized constant temperature control unit receives electric signals of the thermistor probe and then converts the electric signals into data to be sent to the TEC temperature control special integrated chip, and the TEC temperature control special integrated chip contains a PID control algorithm, the acquired temperature data is compared with preset temperature data through a PID control algorithm, and then instruction data is output, the instruction data is converted into PWM signals by a small constant temperature control unit and then is sent to the TEC refrigerating sheet and the cooling fan, and PID control drive of the TEC refrigerating sheet and the cooling fan is achieved.
2. The temperature control and optical path adjusting device of nonlinear optical crystal as claimed in claim 1, wherein: the utility model discloses a heat preservation insulation housing, including heat preservation insulation housing, supporting seat, thermoelectric module, and thermoelectric module, and thermoelectric module, and connection.
3. The temperature control and optical path adjusting device of nonlinear optical crystal according to claim 2, wherein: the crystal clamping device comprises a crystal installation cylinder and a crystal clamping block, wherein the crystal installation cylinder is fixed in the heat-insulating outer shell, the axial direction of the crystal installation cylinder is horizontally vertical to the axial direction of the rotating shaft, an installation through hole is formed in the crystal clamping block, the crystal clamping block is assembled in the crystal installation cylinder in a coaxial rotating mode, and the nonlinear optical crystal is coaxially fixed in the crystal clamping block.
4. The temperature control and optical path adjusting device of nonlinear optical crystal according to claim 3, wherein: the crystal clamping block is internally provided with a deep hole, and the thermistor probe is inserted into the deep hole and is fully contacted with the crystal clamping block.
5. The temperature control and optical path adjusting device of nonlinear optical crystal according to claim 2 or 3, characterized in that: one side of the TEC refrigeration piece is embedded into the crystal installation cylinder and fully contacted with the crystal clamping block, and the other side of the TEC refrigeration piece is contacted with the switching block or fully contacted with the switching block after being embedded into the switching block.
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| CN201811621108.7A CN109814317B (en) | 2018-12-28 | 2018-12-28 | Nonlinear optical crystal temperature control and light path adjusting device |
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| CN112290369A (en) * | 2020-12-24 | 2021-01-29 | 武汉奇致激光技术股份有限公司 | Device for adjusting electro-optical Q-switch and optical equipment mounted with the device |
| CN113867448B (en) * | 2021-10-27 | 2022-09-16 | 北京工业大学 | Temperature control device of nonlinear optical crystal |
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| CN203218694U (en) * | 2012-11-19 | 2013-09-25 | 中国电子科技集团公司第十一研究所 | Heat conduction temperature control device |
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