CN100368865C - High-precision high-power optical fiber coupled laser lighting device - Google Patents
High-precision high-power optical fiber coupled laser lighting device Download PDFInfo
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- CN100368865C CN100368865C CNB2005101083657A CN200510108365A CN100368865C CN 100368865 C CN100368865 C CN 100368865C CN B2005101083657 A CNB2005101083657 A CN B2005101083657A CN 200510108365 A CN200510108365 A CN 200510108365A CN 100368865 C CN100368865 C CN 100368865C
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Abstract
The present invention discloses a high-precision high-power optical-fiber coupling laser illuminating device which belongs to a laser illuminating field. The present invention comprises a laser driver which is used for outputting a driving voltage and lighting up a laser, a driver for generating laser illuminating light sources, a precise temperature control system which can make the working temperature of the laser keep constant, an environment temperature control system which is used for making the working environmental temperature of the laser keep constant, an optical fiber coupler which is used for outputting laser light beams to a light beam shaping collimator, and the light beam shaping collimator, wherein after the laser light beams are shaped and collimated by the collimator, parallel illuminating laser light beams with set diverging angles are formed. The illuminating device of the present invention adopts a method that a self-focusing lens is combined with the optical fiber coupler to generate laser illuminating light beams and can fully utilize the energy of the laser light beams. The present invention has the characteristics of small size, simple structure, easy processing, easy fabrication, low cost, etc. The laser illuminating light beams which are generated have the advantages of stable wavelength, high wavelength accuracy, stable laser output power, etc.
Description
Technical Field
The invention relates to a high-precision high-power optical fiber coupling laser lighting device, in particular to high-power laser lighting, and belongs to the field of laser lighting.
Background
The semiconductor laser has the advantages of small volume, easy pumping, high efficiency, direct modulation and the like. In recent years, with the continuous development of the technology, the laser has been widely applied to the aspects of pumping solid lasers, material processing, medical diagnosis and treatment, space communication, optical storage and the like, but the laser has the defects of large divergence angle and large difference between the divergence angles in the horizontal direction and the vertical direction, particularly a high-power semiconductor laser, and the difference between the divergence angles in the two directions can reach 6: 1, thereby bringing great inconvenience to the use.
Aiming at the infrared long-distance illumination system of the high-power semiconductor laser, in use, on one hand, the shape of an illumination light spot is required to be circular, and simultaneously, the shape of the illumination light spot is required to be still kept or close to the circular shape along with the change of an illumination distance, namely along with the change of a field angle; on the other hand, based on the practical requirement, the system has the characteristics of small volume, light weight, easy assembly and adjustment, compact structure and the like.
For many years, a great deal of research has been done to apply semiconductor lasers to the field of laser illumination. For example, a geometric lens combination collimation system is adopted, which can achieve higher numerical aperture, but has higher requirements on element processing and more complex assembly and adjustment; the function of the system is perfect, but the debugging and the use are difficult; the coupling system of the optical fiber micro lens has high coupling efficiency, compact structure and simple manufacture, but has small deviation tolerance, difficult adjustment and poor stability; the diffraction optical element processed by the micro-electronic process based on the light diffraction principle has the characteristics of small volume, light weight, easy replication, capability of realizing wave surface transformation of any shape and the like, but has high production cost and is not suitable for large-scale industrial application.
Disclosure of Invention
The invention aims to provide a high-precision high-power optical fiber coupling laser lighting device, which aims at the defects of the prior art and is used for designing a laser lighting source which is low in cost, high in precision and easy to industrially generate.
The invention provides a high-precision high-power optical fiber coupling laser lighting device, which comprises:
(1) The laser driver is used for outputting driving voltage and lightening the laser, and the laser driver is connected with the laser;
(2) The driver is used for generating a laser illumination light source, and the laser is connected with the optical fiber coupler;
(3) The precise temperature control system is used for keeping the working temperature of the laser constant and comprises a precise temperature controller, a precise temperature sensor and a precise temperature refrigerator, wherein the precise temperature sensor and the precise temperature refrigerator are packaged with the laser into a whole and are respectively connected with the precise temperature controller outside the laser;
(4) The environment temperature control system is used for keeping the working environment temperature of the laser constant and comprises an environment temperature controller, an environment temperature sensor and an environment temperature refrigerator, wherein the environment temperature sensor and the environment temperature refrigerator are packaged outside the precise temperature sensor and the precise temperature refrigerator and are respectively connected with the environment temperature controller outside the laser;
(5) The optical fiber coupler is connected with the laser and used for outputting the laser beam to the beam shaping collimator;
(6) And the beam shaping collimator is connected with the optical fiber coupler and is used for shaping and collimating the laser beam to form a parallel illumination laser beam with a set divergence angle.
The beam shaping collimator in the laser lighting device comprises an optical fiber, a self-focusing lens and a collimating lens group, wherein one end of the optical fiber is connected with the laser, the other end of the optical fiber is connected with the self-focusing lens through an optical fiber connector, and the self-focusing lens is arranged at the front end of the collimating lens group; length of the self-focusing lens
Wherein A is a refractive index distribution constant of the self-focusing lens; focal length of the collimating lens group
Wherein alpha is the divergence angle of the laser illumination light beam, and d is the diameter of an imaging light spot after the self-focusing lens is imaged.
The high-precision high-power optical fiber coupling laser lighting device provided by the invention adopts a method of combining the self-focusing lens and the optical fiber coupling to generate the laser lighting beam, can fully utilize the energy of the laser beam, and has the characteristics of small volume, simple structure, easy processing and manufacturing, low cost and the like. The invention adopts the temperature control of the secondary laser, namely the working temperature and the environmental temperature of the laser are respectively controlled, so that the light beam for generating laser illumination has the advantages of stable wavelength, high wavelength precision, stable laser output power and the like.
Drawings
Fig. 1 is a structural block diagram of a high-precision high-power fiber-coupled laser lighting device according to the present invention.
Fig. 2 is a schematic diagram of the optical path of a beam shaping collimator in the laser lighting device.
Fig. 3 is a schematic circuit diagram of a precision temperature controller in the laser lighting device.
Fig. 4 is a schematic circuit diagram of an ambient temperature controller in a laser lighting device.
Fig. 5 is a schematic circuit diagram of a laser driver.
In fig. 2, 1 is an optical fiber, 2 is an optical fiber connector, 3 is a self-focusing lens, and 4 is a collimating lens group.
In fig. 3, U1 is a constant current source, U2 to U5 are general operational amplifiers, R1 to R8 are precision resistors, C1 and C2 are capacitors, and U4 is a power amplifier.
In fig. 4, U6 is a constant current source, U7 to U10 are general operational amplifiers, R9 to R16 are precision resistors, C4 and C3 are capacitors, and U5 is a power amplifier.
In fig. 5, U12 and U13 are constant current sources, U11 is an inverter, Q1 and Q2 are transistors, R17 to R22 are precision resistors, L1 is a high-frequency choke coil, and D1 is a laser.
Detailed Description
The structure of the high-precision high-power optical fiber coupling laser lighting device provided by the invention is shown in figure 1, and the high-precision high-power optical fiber coupling laser lighting device comprises:
(1) The laser driver is used for outputting driving voltage and lightening the laser, and the laser driver is connected with the laser;
(2) The driver is used for generating a laser illumination light source, and the laser is connected with the optical fiber coupler;
(3) The precise temperature control system is used for keeping the working temperature of the laser constant and comprises a precise temperature controller, a precise temperature sensor and a precise temperature refrigerator, wherein the precise temperature sensor and the precise temperature refrigerator are packaged with the laser into a whole and are respectively connected with the precise temperature controller outside the laser;
(4) The environment temperature control system is used for keeping the working environment temperature of the laser constant and comprises an environment temperature controller, an environment temperature sensor and an environment temperature refrigerator, wherein the environment temperature sensor and the environment temperature refrigerator are packaged outside the precise temperature sensor and the precise temperature refrigerator and are respectively connected with the environment temperature controller outside the laser;
(5) The optical fiber coupler is connected with the laser and is used for outputting the laser beam to the beam shaping collimator;
(6) And the beam shaping collimator is connected with the optical fiber coupler and is used for shaping and collimating the laser beam to form a parallel illumination laser beam with a set divergence angle.
The temperature controller in the invention has the main functions of setting the normal working temperature of the laser, monitoring and adjusting the temperature change of the laser, and keeping the working temperature of the laser constant. The temperature controller measures the temperature of the laser through the temperature sensor, compares the temperature with the set working temperature of the laser, and then increases or decreases the working temperature of the laser through the compensation link and the temperature regulator according to the comparison result. The environment temperature control part comprises an environment temperature controller, an environment temperature sensor and an environment temperature refrigerator and mainly keeps the temperature of the working environment of the laser constant. The precise temperature control part comprises a precise temperature controller, a precise temperature sensor and a precise temperature refrigerator, and is mainly used for finely adjusting the working temperature of the laser to ensure the output precision of the output laser.
The precise temperature refrigerator and the environment temperature refrigerator are realized by a semiconductor thermoelectric refrigerator, and refrigeration or heating can be realized by providing a certain driving voltage. The precise temperature sensor and the environment temperature sensor are thermistors.
The beam shaping collimator in the laser lighting device of the invention has the structure shown in fig. 2 and comprises an optical fiber 1, a self-focusing lens 3 and a collimating lens group 4. One end of the optical fiber 1 is connected with the laser, the other end is connected with the self-focusing lens 3 through the optical fiber connector 2, and the self-focusing lens 3 is arranged at the front end of the collimating lens group 4.
The optical fiber coupler in the laser lighting device has the main function of outputting laser emitted by a laser to a beam shaping collimator, and can adopt a large-core multimode optical fiber which is produced by long-flying optical fiber cables and has the model number of 200/230-37 PSC. The beam shaping collimator collimates the laser generated by the fiber coupler through an optical system to form a parallel beam with a required divergence angle, namely an illumination laser beam. The beam shaping collimator comprises a self-focusing lens 3 and a collimating lens group 4, and a collimating/focusing lens manufactured by Dachang optical company and having the model number of GCO-24 can also be used.
The main function of the self-focusing lens 3 is to compress the divergence angle of the laser. Assuming that the refractive index distribution constant of the self-focusing lens is A, the length z of the self-focusing lens is generally taken to be
The collimating lens group 4 mainly functions to convert laser spots imaged by the self-focusing lens into parallel beams with a certain divergence angle, so as to realize laser illumination. If the required divergence angle is alpha and the size of the imaging light spot imaged by the self-focusing lens is d, the focal length f of the collimating lens group is
Fig. 3 is a circuit diagram of a precision temperature controller in the laser lighting device according to the present invention. The precise temperature sensor is a thermistor R1. Pin 1 of the constant current source U1 is connected with pin 2 of the R1, and pin 1 of the R1 is connected with the ground. The resistance value of R1 is changed by the temperature change of the laser, and the temperature change is converted into the 2-pin voltage quantity of R1 by the constant current source. Pin 2 of U2 is connected with pin 1 of U1, pin 1 of U2 is connected with output pin 3 of U1, U2 forms voltage emitter follower, and the output voltage of U2 is equal to pin 2 voltage of R1. VREF is a reference voltage input, and the voltage value represents the operating temperature set by the laser. VREF is connected with pin 1 of R2, pin 2 of R2, pin 1 of R5 and pin 1 of U3, pin 1 of R3 is connected with pin 3 of U2, pin 2 of R3, pin 2 of R4 and pin 2 of U3 are connected, and pin 2 of R5 and pin 3 of U3 are connected. R2, R3, R4, R5 and U3 form a subtraction operator, and the 3-pin output voltage of U3 is equal to the difference between VREF and the 2-pin voltage of R1. Pin 3 of U3 is connected with pin 1 of C1 and pin 1 of R6, pin 2 of U4 is grounded through R7, pin 1 of U4 is connected with pin 2 of C1, pin 2 of R6 and pin 1 of R8, pin 2 of R8 is connected with pin 1 of C2, and pin 2 of C2 is connected with pin 3 of U4. C1, R6, R7, R8, C2 and U4 form a compensation link. Pin 2 of U5 is connected to pin 3 of U4, pin 1 of U5 is connected to pin 3 of U5, and the output voltage of U5 and other input voltages generate driving voltage COOL _ DRV1 for driving the thermoelectric refrigerator, so that the thermoelectric refrigerator heats or COOLs.
The circuit diagram of the ambient temperature controller is shown in fig. 4. The ambient temperature sensor is a thermistor R16. Pin 1 of the constant current source U6 is connected to pin 2 of R16, and pin 1 of R16 is connected to ground. The resistance value of R16 is changed by the temperature change of the laser, and the temperature change is converted into the 2-pin voltage quantity of R16 by the constant current source. Pin 2 of U7 is connected to pin 1 of U6, pin 1 of U7 is connected to output pin 3 of U7, U7 forms a voltage follower, and the output voltage of U7 is equal to the pin 2 voltage of R16. VREF is a reference voltage input, the value of which represents the operating temperature set by the laser. VREF is connected with pin 1 of R15, pin 2 of R15, pin 1 of R12 and pin 1 of U8, pin 1 of R14 is connected with pin 3 of U7, pin 2 of R14, pin 2 of R13 and pin 2 of U8 are connected, and pin 2 of R12 and pin 3 of U8 are connected. R12, R13, R14, R15 and U8 form a subtraction operator, and the 3-pin output voltage of U8 is equal to the 2-pin voltage difference of VREF and R16. Pin 3 of U8 is connected with pin 1 of C4 and pin 1 of R11, pin 2 of U9 is grounded through R10, pin 1 of U9 is connected with pin 2 of C4, pin 2 of R11 and pin 1 of R8, pin 2 of R9 is connected with pin 1 of C3, and pin 2 of C3 is connected with pin 3 of U9. C3, R9, R10, R11, C4 and U9 form a compensation link. Pin 2 of U10 is connected to pin 3 of U9, pin 1 of U10 is connected to pin 3 of U10, and the output voltage of U10 and other input voltages generate a driving voltage COOL _ DRV2 for driving the thermoelectric refrigerator, so that the thermoelectric refrigerator of the ambient temperature controller heats or COOLs.
Fig. 5 is a schematic circuit diagram of a laser driver used in the laser lighting device of the present invention, and a laser driver manufactured by ILX Lightwave corporation and having a model number of LDX3412 may also be used. As shown in fig. 5, D1 is a laser, emitting a laser beam. VLD is the output control voltage of the laser driver, which may be a logic high level, at which time the laser outputs a continuous laser illumination beam, or a pulse voltage, at which time the laser outputs a pulsed illumination beam. VLD is connected to pin 1 of R17, pin 1 of inverter U11-A. R17-R19, constant current source U12, and triodes Q1 and Q2 form an emitter coupled switching circuit with high switching speed, so that the light intensity of the laser D1 is modulated. U13 and L1 provide bias current for D1.
Claims (1)
1. A high-precision high-power optical fiber coupling laser lighting device is characterized by comprising:
(1) The laser driver is used for outputting driving voltage and lightening the laser, and the laser driver is connected with the laser;
(2) The driver is used for generating a laser illumination light source, and the laser is connected with the optical fiber coupler;
(3) The precise temperature control system is used for keeping the working temperature of the laser constant and comprises a precise temperature controller, a precise temperature sensor and a precise temperature refrigerator, wherein the precise temperature sensor and the precise temperature refrigerator are packaged with the laser into a whole and are respectively connected with the precise temperature controller outside the laser;
(4) The environment temperature control system is used for keeping the working environment temperature of the laser constant and comprises an environment temperature controller, an environment temperature sensor and an environment temperature refrigerator, wherein the environment temperature sensor and the environment temperature refrigerator are packaged outside the precise temperature sensor and the precise temperature refrigerator and are respectively connected with the environment temperature controller outside the laser;
(5) The optical fiber coupler is connected with the laser and used for outputting the laser beam to the beam shaping collimator;
(6) The beam shaping collimator is connected with the optical fiber coupler and is used for shaping and collimating the laser beam to form a parallel illumination laser beam with a set divergence angle; length of the self-focusing lens
Wherein A is a refractive index distribution constant of the self-focusing lens; focal length of the collimating lens group
Wherein alpha is the divergence angle of the laser illumination light beam, and d is the diameter of the imaging light spot after the self-focusing lens is imaged.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005101083657A CN100368865C (en) | 2005-10-14 | 2005-10-14 | High-precision high-power optical fiber coupled laser lighting device |
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| CNB2005101083657A CN100368865C (en) | 2005-10-14 | 2005-10-14 | High-precision high-power optical fiber coupled laser lighting device |
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| CN1743898A CN1743898A (en) | 2006-03-08 |
| CN100368865C true CN100368865C (en) | 2008-02-13 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102315586A (en) * | 2010-06-29 | 2012-01-11 | 深圳市雷迈科技有限公司 | Semiconductor laser module with multiple detection sensors and protection devices |
| CN104821483B (en) * | 2015-05-28 | 2017-08-25 | 北京理工大学 | A kind of new pattern laser active illumination system |
| CN106711755A (en) * | 2015-11-12 | 2017-05-24 | 北京自动化控制设备研究所 | Semiconductor laser light source for atomic measurement |
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| US5303125A (en) * | 1993-04-19 | 1994-04-12 | Miller Jack V | Fiber optic aimable spotlight luminaire |
| CN2577790Y (en) * | 2002-10-23 | 2003-10-08 | 李育林 | Optical fibre laser contraceptive devices |
| CN1455394A (en) * | 2003-05-30 | 2003-11-12 | 中国科学院上海光学精密机械研究所 | Holographic optical-disk memory device of optical-fiber guide polarized complexing |
| US6672739B1 (en) * | 1999-08-30 | 2004-01-06 | International Business Machines Corp. | Laser beam homogenizer |
| CN1492551A (en) * | 2003-09-30 | 2004-04-28 | 清华大学 | Digital intelligent temperature control method and temperature control semiconductor laser |
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2005
- 2005-10-14 CN CNB2005101083657A patent/CN100368865C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5303125A (en) * | 1993-04-19 | 1994-04-12 | Miller Jack V | Fiber optic aimable spotlight luminaire |
| US6672739B1 (en) * | 1999-08-30 | 2004-01-06 | International Business Machines Corp. | Laser beam homogenizer |
| CN2577790Y (en) * | 2002-10-23 | 2003-10-08 | 李育林 | Optical fibre laser contraceptive devices |
| CN1455394A (en) * | 2003-05-30 | 2003-11-12 | 中国科学院上海光学精密机械研究所 | Holographic optical-disk memory device of optical-fiber guide polarized complexing |
| CN1492551A (en) * | 2003-09-30 | 2004-04-28 | 清华大学 | Digital intelligent temperature control method and temperature control semiconductor laser |
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