CN1743898A - High-precision high-power optical fiber coupled laser lighting device - Google Patents

Abstract

This invention discloses high precision high power optical fiber coupling laser illumination device, which contains laser driving device for outputting driving voltage and igniting laser, driving device for generating laser lumination power supply, precision temperature control system, environment temperature control system, optical fiber coupler, shaping collimator. Said invention has simple structure and low cost with stable wave length of high precision and stable output power.

Description

High-precision high-power optical fiber coupled laser lighting device

Technical field

The present invention relates to a kind of high-precision high-power optical fiber coupled laser lighting device, relate in particular to the high power laser illumination, belong to field of laser illumination.

Background technology

Advantage such as semiconductor laser has little, the easy pumping of volume, efficient height, can directly modulate.In recent years along with the continuous development of its technology, it is widely used at aspects such as light-pumped solid state laser, materials processing, medical diagnosis and treatment, space communtication, optical storages. but the shortcoming that it exists that the angle of divergence is big, horizontal direction and the vertical direction angle of divergence differ greatly, especially high power semiconductor lasers, the angle of divergence of this both direction differs and can bring great inconvenience to use up to 6: 1.

At high power semiconductor lasers infrared remote illuminator, in use require the shape of illumination hot spot rounded on the one hand, also require simultaneously along with the variation of illumination distances promptly along with the change of field angle, the shape of illumination hot spot should still keep or near circular; On the other hand based on the requirement of practicability, characteristics such as system should accomplish that volume is little, in light weight, is easy to debug, compact conformation.

For many years, be applied to field of laser illumination in order to make semiconductor laser, people have carried out a large amount of research work.For example, adopt geometric lens combination colimated light system, it can reach higher numerical aperture, but higher to the processing request of element, debugs complicated; With anamorphic prism disappear astigmatism, orthopedic systems, its perfect in shape and function, but debugging and use difficulty; Use the optical fibre microlens coupled system, coupling efficiency is higher, compact conformation, making are simple, but offset tolerance makes it to be difficult to adjust for a short time, stability not; Based on the diffraction of light principle, adopt the diffraction optical element of microelectronic technique processing, though its volume is little, in light weight, the characteristics such as wavefront transformation that are easy to duplicate, can realize arbitrary shape, the production cost height does not utilize large-scale industrial application.

Summary of the invention

The objective of the invention is to propose a kind of high-precision high-power optical fiber coupled laser lighting device, at the shortcoming of prior art, design low cost, high precision, be easy to the laser lighting light source that industrialization generates.

The high-precision high-power optical fiber coupled laser lighting device that the present invention proposes comprises:

(1) laser driver is used for outputting drive voltage, lights laser instrument, and laser driver links to each other with laser instrument;

(2) driver is used to produce the laser lighting light source, and laser instrument links to each other with fiber coupler;

(3) precision temperature control system, be used to make the working temperature of laser instrument to keep constant, comprise precision temperature controller, precision temperature sensor and precision temperature refrigerator, described precision temperature sensor and precision temperature refrigerator and individual laser package are integral, and link to each other with laser instrument precision temperature controller outward respectively;

(4) environment temperature control system, be used to make the operating ambient temperature of laser instrument to keep constant, comprise environment temperature controller, environment temperature sensor and environment temperature refrigerator, described environment temperature sensor and environment temperature refrigerator are encapsulated in the outside of precision temperature sensor and precision temperature refrigerator, and link to each other with laser instrument environment temperature controller outward respectively;

(5) fiber coupler links to each other with laser instrument, is used for laser beam is outputed to the beam shaping collimating apparatus;

(6) beam shaping collimating apparatus links to each other with fiber coupler, is used for that laser beam is carried out shaping and forms the parallel laser illuminator light beam with setting angle of divergence with the collimation back.

Beam shaping collimating apparatus in the above-mentioned laser illuminator system comprises optical fiber, GRIN Lens and collimation lens set, one end of described optical fiber links to each other with laser instrument, the other end links to each other with GRIN Lens by the joints of optical fibre, and GRIN Lens places the front end of collimation lens set; The length of described GRIN Lens $z=0.23\frac{2\mathrm{\π}}{A},$ Wherein A is the index distribution constant of GRIN Lens; The focal length of described collimation lens set $f=\frac{d}{\mathrm{\α}},$ Wherein α is the angle of divergence of laser lighting light beam, and d is the imaging facula diameter after the GRIN Lens imaging.

The high-precision high-power optical fiber coupled laser lighting device that the present invention proposes, adopt GRIN Lens to produce the laser lighting light beam with the method that the optical fiber coupling combines, can make full use of laser beam energy, have characteristics such as little, simple in structure, the easy processing and manufacturing of volume, cost be low.The present invention adopts the control of diode laser temperature, and promptly the work of laser instrument and environment temperature are controlled respectively, makes the light beam that produces laser lighting have advantages such as Wavelength stabilized, that wavelength accuracy is high, and laser output power is stable.

Description of drawings

Fig. 1 is the structured flowchart of the high-precision high-power optical fiber coupled laser lighting device that proposes of the present invention.

Fig. 2 is the light path synoptic diagram of beam shaping collimating apparatus in the laser illuminator system.

Fig. 3 is the circuit theory diagrams of precision temperature controller in the laser illuminator system.

Fig. 4 is the circuit theory diagrams of environment temperature controller in the laser illuminator system.

Fig. 5 is the circuit theory diagrams of laser driver.

Among Fig. 2, the 1st, optical fiber, the 2nd, the joints of optical fibre, the 3rd, GRIN Lens, the 4th, collimation lens set.

Among Fig. 3, U1 is a constant current source, and U2～U5 is the general-purpose operation amplifier, and R1～R8 is a precision resistance, and C1 and C2 are electric capacity, and U4 is a power amplifier.

Among Fig. 4, U6 is a constant current source, and U7～U10 is the general-purpose operation amplifier, and R9～R16 is a precision resistance, and C4 and C3 are electric capacity, and U5 is a power amplifier.

Among Fig. 5, U12 and U13 are constant current sources, and U11 is a phase inverter, and Q1 and Q2 are triodes, and R17～R22 is a precision resistance, and L1 is the high frequency choke coil, and D1 is a laser instrument.

Embodiment

The high-precision high-power optical fiber coupled laser lighting device that the present invention proposes, its structure comprises as shown in Figure 1:

(1) laser driver is used for outputting drive voltage, lights laser instrument, and laser driver links to each other with laser instrument;

(2) driver is used to produce the laser lighting light source, and laser instrument links to each other with fiber coupler;

(3) precision temperature control system, be used to make the working temperature of laser instrument to keep constant, comprise precision temperature controller, precision temperature sensor and precision temperature refrigerator, described precision temperature sensor and precision temperature refrigerator and individual laser package are integral, and link to each other with laser instrument precision temperature controller outward respectively;

(4) environment temperature control system, be used to make the operating ambient temperature of laser instrument to keep constant, comprise environment temperature controller, environment temperature sensor and environment temperature refrigerator, described environment temperature sensor and environment temperature refrigerator are encapsulated in the outside of precision temperature sensor and precision temperature refrigerator, and link to each other with laser instrument environment temperature controller outward respectively;

(5) fiber coupler links to each other with laser instrument, is used for laser beam is outputed to the beam shaping collimating apparatus;

(6) beam shaping collimating apparatus links to each other with fiber coupler, is used for that laser beam is carried out shaping and forms the parallel laser illuminator light beam with setting angle of divergence with the collimation back.

The major function of the temperature controller among the present invention is the normal working temperature of setting laser device, monitors and regulate the temperature variation of laser instrument, makes the working temperature of laser instrument keep constant.Temperature controller passes through the temperature of temperature sensor measurement laser instrument, and compares with the setting working temperature of laser instrument, then with the working temperature of above-mentioned comparative result by compensation tache and temperature regulator rising or reduction laser instrument.The environment temperature control partly comprises environment temperature controller, environment temperature sensor and environment temperature refrigerator, mainly is the temperature constant that keeps the working environment of laser instrument.Accurate temperature control partly comprises precision temperature controller, precision temperature sensor and precision temperature refrigerator, mainly is the working temperature fine setting to laser instrument, guarantees the output laser output accuracy.

Precision temperature refrigerator and environment temperature refrigerator are realized by the semiconductor thermoelectric refrigeration device, by certain driving voltage is provided, can be freezed or heat.Precision temperature sensor and environment temperature sensor are thermistor.

Beam shaping collimating apparatus in the laser illuminator system of the present invention, its structure comprise optical fiber 1, GRIN Lens 3 and collimation lens set 4 as shown in Figure 2.One end of optical fiber 1 links to each other with laser instrument, and the other end links to each other with GRIN Lens 3 by the joints of optical fibre 2, and GRIN Lens 3 places the front end of collimation lens set 4.

Fiber coupler in the laser illuminator system of the present invention, the laser that major function is launched laser instrument outputs to the beam shaping collimating apparatus, and the model that can adopt Yangtze Optical Fiber and Cable Company Ltd to produce is the big core diameter multimode optical fiber of 200/230-37 PSC.After the laser that the beam shaping collimating apparatus produces fiber coupler collimates by optical system, form parallel beam, i.e. the laser illuminator light beam with needed angle of divergence.The beam shaping collimating apparatus comprises GRIN Lens 3 and collimation lens set 4, can use also that photoelectricity company of Daheng produces model be collimation/condenser lens of GCO-24.

The major function of GRIN Lens 3 is angles of divergence of compression laser instrument.If the index distribution constant of GRIN Lens is A, then the length z of GRIN Lens is taken as usually $z=0.23\frac{2\mathrm{\π}}{A}.$

The major function of collimation lens set 4 is to change the parallel beam with certain dispersion angle into through the laser facula after the GRIN Lens imaging, realizes laser lighting.If needed dispersion angle is α, be d through the imaging facula size after the GRIN Lens imaging, then the focal distance f of collimation lens set is $f=\frac{d}{\mathrm{\α}}.$

The circuit diagram of the precision temperature controller in the laser illuminator system of the present invention, as shown in Figure 3.The precision temperature sensor is thermistor R1.1 pin of constant current source U1 links to each other with 2 pin of R1, and 1 pin of R1 links to each other with ground.Laser temperature change makes and the change in resistance of R1 makes temperature variation be transformed into the 2 pin voltages of R1 by constant current source.2 pin of U2 link to each other with 1 pin of U1, and 1 pin of U2 is connected with the output pin 3 of U1, and U2 constitutes the voltage emitter follower, and the output voltage of U2 equals the 2 pin voltages of R1.VREF is the reference voltage input, and this magnitude of voltage is represented the working temperature of laser setup.VREF is connected with 1 pin of R2, and 1 pin of 2 pin of R2,1 pin of R5 and U3 links to each other, and 1 pin of R3 is connected with 3 pin of U2, and 2 pin of 2 pin of R3,2 pin of R4 and U3 are connected, and 2 pin of R5 and 3 pin of U3 are connected.R2, R3, R4, R5 and U3 constitute the subtraction device, and the 3 pin output voltages of U3 equal the voltage difference of 2 pin of VREF and R1.1 pin of 3 pin of U3 and 1 pin of C1, R6 is connected, and 2 pin of U4 are by R7 ground connection, and 1 pin of U4 is connected with 2 pin of 2 pin of C1, R6,1 pin of R8, and 2 pin of R8 and 1 pin of C2 are connected, and 2 pin of C2 and 3 pin of U4 are connected.C1, R6, R7, R8, C2 and U4 constitute compensation tache.2 pin of U5 are connected with 3 pin of U4, and 1 pin of U5 is connected with 3 pin of U5, and input voltages such as the output voltage of U5 produce the driving voltage COOL_DRV1 that drives thermoelectric refrigerating unit, make thermoelectric refrigerating unit heating or refrigeration.

The circuit diagram of environment temperature controller as shown in Figure 4.Environment temperature sensor is thermistor R16.1 pin of constant current source U6 links to each other with 2 pin of R16, and 1 pin of R16 links to each other with ground.Laser temperature change makes and the change in resistance of R16 makes temperature variation be transformed into the 2 pin voltages of R16 by constant current source.2 pin of U7 link to each other with 1 pin of U6, and 1 pin of U7 is connected with the output pin 3 of U7, and U7 constitutes the voltage emitter follower, and the output voltage of U7 equals the 2 pin voltages of R16.VREF is the reference voltage input, and this magnitude of voltage is represented the working temperature of laser setup.VREF is connected with 1 pin of R15, and 1 pin of 2 pin of R15,1 pin of R12 and U8 links to each other, and 1 pin of R14 is connected with 3 pin of U7, and 2 pin of 2 pin of R14,2 pin of R13 and U8 are connected, and 2 pin of R12 and 3 pin of U8 are connected.R12, R13, R14, R15 and U8 constitute the subtraction device, and the 3 pin output voltages of U8 equal the voltage difference of 2 pin of VREF and R16.1 pin of 3 pin of U8 and 1 pin of C4, R11 is connected, and 2 pin of U9 are by R10 ground connection, and 1 pin of U9 is connected with 2 pin of 2 pin of C4, R11,1 pin of R8, and 2 pin of R9 and 1 pin of C3 are connected, and 2 pin of C3 and 3 pin of U9 are connected.C3, R9, R10, R11, C4 and U9 constitute compensation tache.2 pin of U10 are connected with 3 pin of U9, and 1 pin of U10 is connected with 3 pin of U10, and input voltages such as the output voltage of U10 produce the driving voltage COOL_DRV2 that drives thermoelectric refrigerating unit, make the thermoelectric refrigerating unit heating or the refrigeration of environment temperature controller.

Fig. 5 is the circuit theory diagrams of laser driver used in the laser illuminator system of the present invention, also can use model that ILXLightwave company the produces laser driver as LDX3412.As shown in Figure 5, D1 is a laser instrument, the emission laser beam.VLD is the output control voltage of laser driver, can be logic high, and laser instrument output CW-laser illuminator this moment light beam also can be pulse voltage, laser instrument output pulsing light this moment light beam.VLD links to each other with 1 pin of R17,1 pin of phase inverter U11-A.R17～R19, constant current source U12, triode Q1 and Q2 constitute emitter-base bandgap grading coupled switch circuit, and switching speed is fast, and the light intensity of laser instrument D1 is modulated.U13 and L1 provide bias current for D1.

Claims (2)

1, a kind of high-precision high-power optical fiber coupled laser lighting device is characterized in that this device comprises:

(1) laser driver is used for outputting drive voltage, lights laser instrument, and laser driver links to each other with laser instrument;

(2) driver is used to produce the laser lighting light source, and laser instrument links to each other with fiber coupler;

(3) precision temperature control system, be used to make the working temperature of laser instrument to keep constant, comprise precision temperature controller, precision temperature sensor and precision temperature refrigerator, described precision temperature sensor and precision temperature refrigerator and individual laser package are integral, and link to each other with laser instrument precision temperature controller outward respectively;

(4) environment temperature control system, be used to make the operating ambient temperature of laser instrument to keep constant, comprise environment temperature controller, environment temperature sensor and environment temperature refrigerator, described environment temperature sensor and environment temperature refrigerator are encapsulated in the outside of precision temperature sensor and precision temperature refrigerator, and link to each other with laser instrument environment temperature controller outward respectively;

(5) fiber coupler links to each other with laser instrument, is used for laser beam is outputed to the beam shaping collimating apparatus;

(6) beam shaping collimating apparatus links to each other with fiber coupler, is used for that laser beam is carried out shaping and forms the parallel laser illuminator light beam with setting angle of divergence with the collimation back.

2, laser illuminator system as claimed in claim 1, it is characterized in that wherein said beam shaping collimating apparatus comprises optical fiber, GRIN Lens and collimation lens set, one end of described optical fiber links to each other with laser instrument, the other end links to each other with GRIN Lens by the joints of optical fibre, and GRIN Lens places the front end of collimation lens set; The length of described GRIN Lens $z=0.23\frac{2\mathrm{\π}}{A},$ Wherein A is the index distribution constant of GRIN Lens; The focal length of described collimation lens set $f=\frac{d}{\mathrm{\α}},$ Wherein α is the angle of divergence of laser lighting light beam, and d is the imaging facula diameter after the GRIN Lens imaging.

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