CN110165536B - Tunable all-solid-state white light laser system - Google Patents
Tunable all-solid-state white light laser system Download PDFInfo
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- CN110165536B CN110165536B CN201910493119.XA CN201910493119A CN110165536B CN 110165536 B CN110165536 B CN 110165536B CN 201910493119 A CN201910493119 A CN 201910493119A CN 110165536 B CN110165536 B CN 110165536B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES 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
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES 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
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/105—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the mutual position or the reflecting properties of the reflectors of the cavity, e.g. by controlling the cavity length
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES 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
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
- H01S3/109—Frequency multiplication, e.g. harmonic generation
- H01S3/1095—Frequency multiplication, e.g. harmonic generation self doubling, e.g. lasing and frequency doubling by the same active medium
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Abstract
The invention relates to a tunable all-solid-state white light laser system, which belongs to the technical field of white laser display and comprises a blue light LD, a self-frequency-doubling yellow light laser and a laser beam combining component, wherein light emitted by the blue light LD and light emitted by the self-frequency-doubling yellow light laser are combined by the laser beam combining component to form white light laser, the working wavelength of the blue light LD is 430-doped 450nm, and the working wavelength of the self-frequency-doubling yellow light laser is 560-doped 590 nm. According to the invention, white light laser is obtained by matching according to a proper proportion through a spatial color mixing principle, a blue light component and a yellow light component in the system are independently adjustable, and the adjustment of cold white light, natural white light and warm white light of the system can be realized by controlling the power ratio of the blue light component and the yellow light component; the invention does not need a super-continuum spectrum generation device, a white light extraction device and other complex devices, has the advantages of adjustable real-time chromaticity and easy integration, and is particularly suitable for the field of high-power special illumination display.
Description
Technical Field
The invention relates to a tunable all-solid-state white light laser system, and belongs to the technical field of white laser display.
Background
In recent years, development based on Light-Emitting diodes (LEDs) as Light sources or excitation Light sources for illumination display devices has shown great application potential, and has been applied to general illumination, landscape illumination, stage illumination, automobile illumination, traffic signals, backlight sources, display screens, indicator lamps, camera flash lamps and the like, and will play an important role in the fields of medical treatment, information, agriculture, aviation, aerospace and the like. However, a high-power integrated white light source is yet to be developed to apply the LED and related devices to a large scale in special places or fields such as airports and stadiums.
At present, the most common method for manufacturing a white light LED is to coat a layer of yellow phosphor on the surface of a blue light LED chip, but the method for coating the phosphor generally adopts a traditional dispensing process, the production efficiency of the process is not high, the process cannot adapt to batch production in modern industry, and the irregular shape of a powder layer causes uneven spatial distribution of light emitted from a single white light LED. In addition, the ultraviolet conversion method generates white light, the light used for illumination is all from fluorescent materials, although the color rendering property is improved, the process complexity and the stability are still to be improved, and meanwhile, the hidden danger of ultraviolet pollution exists when an ultraviolet light source is used as an excitation light source. Another way to realize white light is a three-primary-color LED color mixing method, where the light used for illumination is totally from the light emitting diode, and white light display is obtained by spatial color mixing principle according to proper proportion matching. However, the mounting structure is complex, and the driving voltage, the light emitting efficiency and the color matching characteristic of the LEDs of various colors are different, so that the circuit is complex to realize. Meanwhile, the aging degrees of the LEDs of various colors are different along with the time, so that the light attenuation difference and the color change are caused, and the stability of mixed light is poor. In addition, the white light obtained by the above method still has a lot of inconveniences in the chromaticity adjustability of the white light device once the white light is packaged.
The laser lighting and displaying technology has the advantages of high brightness, low light beam divergence, long service life, stable performance and the like, and is particularly suitable for the high-power special lighting and displaying field, such as laser car lamps, projection display and the like. Laser illumination and display will also certainly lead to a new revolution of technological innovation as a new generation of display technology. Due to limitations in laser technology and output wavelength, etc., it has long been in the research and experimental stages. At present, the beam combining technology of red, green and blue lasers is the most common method for realizing white light lasers, but the light combining mode of more beams is complex, the production efficiency is inevitably reduced in the batch production process, and the production steps and the cost are increased.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a tunable all-solid-state white light laser system, which synthesizes white light by using a blue light LD and a self-frequency-doubling all-solid-state yellow laser, can greatly simplify the subsequent light path shaping system and production steps, and reduces the production cost.
Interpretation of terms:
LD: laser diode, shorthand.
Chroma: color is commonly represented by luminance and chrominance, which is a property of color excluding luminance, and reflects the hue and saturation of color, and in order to define a device-independent color model from primary colors, CIE (Commission international de L' Eclairage) color scientists define the CIE xyY color space, i.e., the CIE chromaticity diagram, Y represents the response of the human eye to luminance, and color coordinates (x, Y) accurately specify color.
High transmittance: means that the transmittance of light with a specific wavelength or waveband is more than 99%.
High reflection: meaning that the reflectance for incident light of a particular wavelength or band of wavelengths is greater than 99%.
The invention adopts the following technical scheme:
a tunable all-solid-state white light laser system comprises a blue light LD, a self-frequency-doubling yellow light laser and a laser beam combining component, wherein light emitted by the blue light LD and light emitted by the self-frequency-doubling yellow light laser are combined by the laser beam combining component to form white light laser, the working wavelength of the blue light LD is 430-doped 450nm, and the working wavelength of the self-frequency-doubling yellow light laser is 560-doped 590 nm.
Preferably, the blue light emitted by the blue LD and the yellow light emitted by the self-frequency-doubling yellow laser are independently adjustable, based on the spatial color mixing principle, different chromaticity adjustments of the white light of the system can be realized by controlling the power ratio and/or wavelength of the blue light LD, and free switching among cold white light, natural white light and warm white light can also be realized; in the prior art, knobs capable of adjusting the current are arranged on the pumping sources of the blue LD and the self-frequency-doubling yellow laser, and the current can be controlled by rotating the knobs, so that the purpose of adjusting the respective power is achieved; the self-frequency-doubling yellow laser output wavelength can be controlled by adjusting the crystal temperature or pumping power and the cavity mirror dielectric film, the invention mainly adopts the cavity mirror dielectric film to control the output wavelength and ensure the stable output of the wavelength under different powers under the constant crystal temperature, thereby avoiding the crystal temperature change brought by the laser under the high working power and further inducing unstable factors, and further prolonging the service life of the device.
In the invention, the laser beam combining component can adopt various forms, can be flexibly adjusted according to actual needs, as long as the function of combining blue light and yellow light can be realized, and the laser beam combining component preferably adopts the following two structures:
a: the laser beam combination component is a beam splitter component, the beam splitter component comprises a beam splitter, a yellow light beam emitted by the self-frequency doubling yellow laser enters a yellow light reflecting mirror surface of the beam splitter at an incidence angle of 45 degrees, the light path direction is changed by 90 degrees and is combined with a blue light beam emitted by the blue LD and perpendicular to the incidence direction of the yellow light beam, and the beam splitter is fixedly installed at the vertical intersection of the blue light beam and the yellow light beam and forms a 45 degree angle with the two incident light beams respectively.
B: the laser beam combining component is an optical fiber beam combining component, the optical fiber beam combining component comprises optical fibers, two ports A located at the head end and a port B located at the tail end, the optical fibers are in a herringbone shape, one port A is connected with a blue light LD, the other port A is connected with a self-frequency-doubling yellow light laser, light emitted by the blue light LD and light emitted by the self-frequency-doubling yellow light laser are led into the optical fibers to enable the blue light and the yellow light to be mixed and combined in the optical fibers, and the mixed white light is directly output through the port B at the tail end of the optical fibers.
Preferably, the self-frequency-doubling yellow laser comprises a pumping source, a focusing system, an input mirror, a laser self-frequency-doubling crystal and an output mirror which are sequentially arranged, wherein the input mirror and the output mirror form a resonant cavity, and the laser self-frequency-doubling crystal can realize laser oscillation and nonlinear frequency conversion at the same time;
the laser self-frequency doubling crystal is preferably one of calcium yttrium oxide borate, calcium lanthanum oxide borate and calcium gadolinium oxide borate or a mixed crystal of two or three of the calcium yttrium oxide borate, the calcium lanthanum oxide borate and the calcium gadolinium oxide borate;
the pumping source is a laser diode laser with the emission wavelength of 970-980 nm;
the light passing direction of the laser self-frequency doubling crystal is the phase matching direction of the self-frequency doubling crystal, namely cutting along the maximum direction of the effective nonlinear coefficient of a non-principal plane of the crystal, the laser self-frequency doubling crystal is plated with dielectric films which are highly transparent to excitation light, oscillation light and frequency doubling light, and an input mirror and an output mirror are respectively plated with cavity mirror dielectric films so as to realize stable output of 560-590nm yellow laser with different wavelengths;
laser oscillation and nonlinear frequency conversion are generated through the laser self-frequency doubling crystal, pump light emitted by the pump source is collimated and focused through the focusing system and is injected into the laser self-frequency doubling crystal through the input mirror, the laser self-frequency doubling crystal absorbs pump light energy to generate base frequency light in the laser resonant cavity, and the base frequency light is subjected to frequency doubling by utilizing the frequency doubling effect of the laser self-frequency doubling crystal, so that yellow laser output with the working wavelength of 560 + 590nm is realized.
Preferably, a crystal temperature control device is arranged in a non-laser action area of the laser self-frequency doubling crystal and used for adjusting the temperature of the crystal.
Preferably, the crystal temperature control device is a semiconductor refrigerating piece, the size of the semiconductor refrigerating piece is preferably matched with the size of a non-laser action area of the self-frequency doubling crystal and is tightly attached to the non-laser action area of the self-frequency doubling crystal, and the temperature of the laser self-frequency doubling crystal is stabilized within a certain range; the semiconductor refrigeration piece is a current transduction type piece, current is introduced into the semiconductor refrigeration piece, high-precision temperature control can be achieved through control of input current, meanwhile, control processes such as remote control, program control and computer control are easily achieved through temperature detection and control means, and an automatic control system convenient to integrate is formed. The semiconductor refrigerating sheet is arranged to provide guarantee for the stability of the working temperature of the laser self-frequency doubling crystal, and further the stability of the yellow light working wavelength is guaranteed.
Further preferably, the temperature of the laser self-frequency doubling crystal is 5-30 ℃ to ensure the stability of the output wavelength and the prolonging of the working life of the crystal.
Preferably, the self-frequency-doubling yellow laser is further provided with a fine adjustment device for adjusting the resonant cavity to move back and forth along the light path direction, the fine adjustment device comprises two parallel slideways and a slide rod matched with the two slideways, the input mirror and the output mirror are respectively fixed on the two slide rods, the slide rod adjusts the moving distance of the slide rod on the slideway through a knob, and then the resonant cavity is finely adjusted after the cavity mirror plated with the specific dielectric film is replaced, so that the yellow laser output with the specific wavelength is realized. The arrangement of the fine adjustment device can facilitate the position fine adjustment during the wavelength adjustment after the input mirror and the output mirror are replaced.
Preferably, the laser self-frequency doubling crystal is calcium yttrium oxide borate with ytterbium ion doping concentration of 15-30%, and the laser self-frequency doubling crystal integrates a laser crystal and a nonlinear crystal, can provide stable yellow laser output for the system and can meet the compact device configuration requirement.
Preferably, the light-passing surface of the laser self-frequency doubling crystal is preferably cylindrical or rectangular, and the length of the laser self-frequency doubling crystal in the light-passing direction is preferably 4-20 mm.
Preferably, the blue LD is a blue LD with mature technology, can be selected from common commercial products, is preferably an LR-BSP-440/5-10W blue LD produced by Chongchang radium-Sharp electro-optical technology Limited company, and can be replaced by a higher-power blue laser if necessary.
In the present invention, the details are not described in detail, and the present invention can be carried out by using the prior art.
The invention has the beneficial effects that:
1) the tunable all-solid-state white light laser system has relatively flexible white light chromaticity adjustment, the blue light source and the yellow light source respectively adopt the blue light LD with mature technology and the self-frequency-doubling yellow light laser developed by the blue light LD, the blue light emitted by the blue light LD and the yellow light emitted by the self-frequency-doubling yellow light laser are independently adjustable, and based on the spatial color mixing principle, different chromaticity adjustment of the white light of the system can be realized by controlling the power ratio and/or wavelength of the blue light LD and the yellow light emitted by the self-frequency-doubling yellow light laser, so that the output of cold white light, natural white light and. Compared with the traditional red, green and blue three-primary-color laser beam combination technology, the laser beam combination technology has the advantages that the adjustment is more convenient, the subsequent light path shaping system and the production steps can be greatly simplified, and the production cost is reduced.
2) The tunable all-solid-state white light laser system does not need a super-continuum spectrum generation device, a white light extraction device and other complex devices, has the advantages of adjustable real-time chromaticity and easiness in integration, can be better adapted and meet the application with strict requirement on chromaticity, has stronger condition adaptability and practicability, has good stability of mixed light, can be suitable for the field of high-power white light illumination display, and in addition, each part easy to integrate also provides convenience for high integration of white light devices.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment 1 of a tunable all-solid-state white light laser system according to the present invention;
fig. 2 is a schematic structural diagram of an embodiment 3 of the tunable all-solid-state white light laser system according to the present invention;
fig. 3 is a spectrum curve of a mixed light source in which a blue LD and a self-frequency-doubled yellow laser cooperate in embodiment 4 of the present invention, where the abscissa is the operating wavelength (unit nm), the ordinate is the intensity, and the intensity ratio of blue light to yellow light is 5: 2;
FIG. 4 is the chromaticity coordinate information of the mixed light sources used in examples 4-9 under different intensity ratio conditions;
FIG. 5 is the chromaticity coordinate information of the mixed light sources used in examples 10 to 14 under different intensity ratio conditions;
FIG. 6 is the chromaticity coordinate information of the mixed light sources used in examples 15 to 20 under different intensity ratio conditions;
the system comprises a pump source 1, a focusing system 2, an input mirror 3, a laser self-frequency-doubling crystal 4, an output mirror 5, a semiconductor refrigerating chip 6, a fine-tuning device 7, a blue-light LD 8, a beam splitter 9 and an optical fiber 10.
The specific implementation mode is as follows:
in order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific examples, but not limited thereto, and the present invention is not described in detail and is in accordance with the conventional techniques in the art.
Example 1:
a tunable all-solid-state white light laser system is shown in figure 1 and comprises a blue light LD 8, a self-frequency-doubling yellow light laser and a laser beam combining component, wherein light emitted by the blue light LD 8 and light emitted by the self-frequency-doubling yellow light laser are combined by the laser beam combining component to form white light laser, the working wavelength of the blue light LD 8 is 440nm, and the working wavelength of the self-frequency-doubling yellow light laser is 577 nm;
in this embodiment, the laser beam combination group is a beam splitter component, the beam splitter component includes a beam splitter 9, a yellow light beam emitted from the frequency doubling yellow laser enters a yellow light reflecting mirror surface of the beam splitter 9 at an incident angle of 45 °, a light path direction is changed by 90 °, the light path direction is combined with a blue light beam emitted from the blue LD 8 and perpendicular to the incident direction of the yellow light beam, and the beam splitter 9 is fixedly installed at a vertical intersection of the blue light beam and the yellow light beam, and forms an angle of 45 ° with the two incident light beams respectively;
the blue LD is LR-BSP-440/5-10W blue LD produced by Vinca radium-Sharp photoelectricity technology Limited;
as shown in figure 1, the self-frequency-doubling yellow laser comprises a pumping source 1, a focusing system 2, an input mirror 3, a laser self-frequency-doubling crystal 4 and an output mirror 5 which are sequentially arranged, wherein the input mirror 3 and the output mirror 5 form a resonant cavity, the laser self-frequency-doubling crystal 4 is calcium yttrium oxide borate with ytterbium ion doping concentration of 15% -30%, the laser self-frequency-doubling crystal 4 can simultaneously realize laser oscillation and nonlinear frequency conversion, wherein the input mirror 3 is plated with a dielectric film which has high transmission to 900-plus 1100nm, 1150-plus 1158nm and 575-579nm, the laser self-frequency doubling crystal 4 is cut along the phase matching direction with the maximum effective nonlinear coefficient, and is plated with a dielectric film which has high transmission to the excitation light, the oscillation light and the frequency doubling light, and the output mirror 5 is plated with a dielectric film which has high transmission to 900-plus 980nm and 1150-plus 1158nm, and has high transmission to 980-plus 1100nm and 575-plus 579 nm;
the pump source 1 is a laser diode laser with an emission wavelength of 970-.
Example 2:
the tunable all-solid-state white light laser system is structurally shown in embodiment 1, and is different from the structure that a semiconductor refrigerating sheet 6 is arranged in a non-laser action area of a laser self-frequency doubling crystal and is tightly attached to the non-laser action area of the self-frequency doubling crystal, so that the temperature of the laser self-frequency doubling crystal is stabilized within a certain range (5-30 ℃).
Example 3:
the structure of the tunable all-solid-state white light laser system is as shown in embodiment 1, except that, as shown in fig. 2, the laser beam combining component is an optical fiber beam combining component, the optical fiber beam combining component comprises an optical fiber 10, two ports a located at the head end and a port B located at the tail end, the optical fiber 10 is in a herringbone shape, one port a is connected with a blue light LD 8, the other port a is connected with a self-frequency-doubling yellow light laser, light emitted by the blue light LD 8 and light emitted by the self-frequency-doubling yellow light laser are led into the optical fiber 10 to enable the blue light and the yellow light to be mixed and combined in the optical fiber, and the mixed white light is directly output through the port B at the tail end of the optical.
Example 4:
the tunable all-solid-state white light laser system is structurally characterized in that a fine adjustment device 7 for adjusting the resonant cavity to move back and forth along the light path direction is further arranged on the self-frequency-doubling yellow light laser, the fine adjustment device 7 comprises two parallel slide ways and slide bars matched with the two slide ways, an input mirror 3 and an output mirror 4 are respectively fixed on the two slide bars, the slide bars adjust the moving distance of the slide bars on the slide ways through knobs, fine adjustment of the resonant cavity after the cavity mirror in the resonant cavity is changed is conveniently achieved, and stable output of the yellow light laser is further guaranteed. The peak intensity ratio is 5 by regulating and controlling the working power ratio of the blue LD and the self-frequency-doubling yellow laser, and regulating and fine-tuning devices (the fine-tuning devices generally only carry out fine tuning after replacing a cavity mirror when the wavelength is regulated): and 2, the chromaticity synthesis principle is applied to the mixed laser source, which is represented as B5-Y2 (the subsequent intensity ratios are all represented in this form), and finally, the chromaticity coordinates of the white light displayed in the standard chromaticity system 1931cie are (0.3434, 0.2792), as shown in fig. 4, and fig. 3 is a spectrum curve of the mixed laser source in which the blue LD and the self-frequency-doubling yellow laser work cooperatively.
Example 5:
a tunable all-solid-state white-light laser system, whose structure is shown in embodiment 4, except that the operating power ratio of the blue LD and the self-frequency-doubled yellow laser is adjusted to make the peak intensity ratio 5: 3, denoted as B5-Y3, the chromaticity coordinates of the white light finally displayed in the standard chromaticity system 1931cie obtained by applying the chromaticity synthesis principle to the mixed laser light source are (0.3756, 0.3268), as shown in fig. 4.
Example 6:
a tunable all-solid-state white-light laser system, whose structure is shown in embodiment 4, except that the operating power ratio of the blue LD and the self-frequency-doubled yellow laser is adjusted to make the peak intensity ratio 5: and 4, denoted as B5-Y4, applying the principle of chromaticity synthesis to the mixed laser light source to finally display white light with chromaticity coordinates (0.3965, 0.3576) in a standard chromaticity system 1931cie, as shown in fig. 4.
Example 7:
a tunable all-solid-state white-light laser system, whose structure is shown in embodiment 4, except that the operating power ratio of the blue LD and the self-frequency-doubled yellow laser is adjusted to make the peak intensity ratio 5: 5, denoted as B5-Y5, the chromaticity coordinates of white light finally displayed in the standard chromaticity system 1931cie obtained by applying the chromaticity synthesis principle to the mixed laser light source are (0.4111, 0.3792), as shown in fig. 4.
Example 8:
a tunable all-solid-state white-light laser system, whose structure is shown in embodiment 4, except that the operating power ratio of the blue LD and the self-frequency-doubled yellow laser is adjusted to make the peak intensity ratio be 4: and 5, denoted as B4-Y5, applying the chromaticity synthesis principle to the mixed laser light source to finally display white light with chromaticity coordinates (0.4146, 0.387) in a standard chromaticity system 1931cie, as shown in fig. 4.
Example 9:
a tunable all-solid-state white-light laser system, whose structure is shown in embodiment 4, except that the operating power ratio of the blue LD and the self-frequency-doubled yellow laser is adjusted to make the peak intensity ratio 3: and 5, denoted as B3-Y5, applying the principle of chromaticity synthesis to the mixed laser light source to finally display white light with chromaticity coordinates (0.4218, 0.3951) in a standard chromaticity system 1931cie, as shown in fig. 4.
Example 10:
a tunable all-solid-state white light laser system is structurally shown in embodiment 4, and is different from that an input mirror 3 is plated with dielectric films with high transmission to 900-plus 1100nm, 1154-plus 1162nm and 577-581nm, an output mirror 5 is plated with dielectric films with high reflection to 900-plus 980nm and 1154-plus 1162nm, high transmission to 980-plus 1100nm and high transmission to 577-plus 581nm, and after the cavity mirror is replaced, a fine adjustment device is adjusted to enable the working wavelength of a self-frequency doubling yellow light laser to be stabilized at 579 nm; the working wavelength of the blue light LD is 440 nm;
regulating and controlling the working power ratio of the blue LD and the self-frequency-doubling yellow laser to ensure that the peak intensity ratio is 5: and 5, denoted as B5-Y5, applying the principle of chromaticity synthesis to the mixed laser light source to finally display white light with chromaticity coordinates (0.3486, 0.2856) in a standard chromaticity system 1931cie, as shown in fig. 5.
Example 11:
a tunable all-solid-state white-light laser system, whose structure is shown in embodiment 10, except that the operating power ratio of the blue LD and the self-frequency-doubled yellow laser is adjusted to make the peak intensity ratio be 4: 5, denoted as B4-Y5, the chromaticity coordinates of white light finally displayed in a standard chromaticity system 1931cie obtained by applying the chromaticity synthesis principle to the mixed laser light source are (0.3555, 0.296), as shown in fig. 5.
Example 12:
a tunable all-solid-state white-light laser system, whose structure is shown in embodiment 10, except that the operating power ratio of the blue LD and the self-frequency-doubled yellow laser is adjusted to make the peak intensity ratio 3: 5, denoted as B3-Y5, the chromaticity coordinates of the white light finally displayed in the standard chromaticity system 1931cie obtained by applying the chromaticity synthesis principle to the mixed laser light source are (0.363, 0.307), as shown in fig. 5.
Example 13:
a tunable all-solid-state white-light laser system, whose structure is shown in embodiment 10, except that the operating power ratio of the blue LD and the self-frequency-doubled yellow laser is adjusted to make the peak intensity ratio be 2: and 5, denoted as B2-Y5, applying the principle of chromaticity synthesis to the mixed laser light source to finally display white light with chromaticity coordinates (0.3711, 0.3192) in a standard chromaticity system 1931cie, as shown in fig. 5.
Example 14:
a tunable all-solid-state white-light laser system, whose structure is shown in embodiment 10, except that the operating power ratio of the blue LD and the self-frequency-doubled yellow laser is adjusted to make the peak intensity ratio 1: and 5, denoted as B1-Y5, applying the principle of chromaticity synthesis to the mixed laser light source to finally display white light with chromaticity coordinates (0.3798, 0.3322) in a standard chromaticity system 1931cie, as shown in fig. 5.
Example 15:
a tunable all-solid-state white light laser system is disclosed in embodiment 4, the structure of which is as shown in embodiment 4, the difference is that an input mirror 3 is plated with dielectric films with high transmission to 900-; the working wavelength of the blue light LD is 440 nm;
regulating and controlling the working power ratio of the blue LD and the self-frequency-doubling yellow laser to ensure that the peak intensity ratio is 5: 1, denoted as B5-1, and using the principle of chromaticity synthesis, the mixed laser light source finally displays white light with chromaticity coordinates (0.2862, 0.1795) in a standard chromaticity system 1931cie, as shown in fig. 6.
Example 16:
a tunable all-solid-state white-light laser system, whose structure is shown in example 15, except that the operating power ratio of the blue LD and the self-frequency-doubled yellow laser is adjusted to make the peak intensity ratio 5: 2, denoted as B5-Y2, the chromaticity coordinates of the white light finally displayed in the standard chromaticity system 1931cie obtained by applying the chromaticity synthesis principle to the mixed laser light source are (0.345, 0.2588), as shown in fig. 6.
Example 17:
a tunable all-solid-state white-light laser system, whose structure is shown in example 15, except that the operating power ratio of the blue LD and the self-frequency-doubled yellow laser is adjusted to make the peak intensity ratio 5: 3, denoted as B5-Y3, the chromaticity coordinates of the white light finally displayed in the standard chromaticity system 1931cie obtained by applying the chromaticity synthesis principle to the mixed laser light source are (0.3794, 0.3051), as shown in fig. 6.
Example 18:
a tunable all-solid-state white-light laser system, whose structure is shown in example 15, except that the operating power ratio of the blue LD and the self-frequency-doubled yellow laser is adjusted to make the peak intensity ratio 5: and 4, denoted as B5-Y4, applying the principle of chromaticity synthesis to the mixed laser light source to finally display white light with chromaticity coordinates of (0.402, 0.3355) in a standard chromaticity system 1931cie, as shown in fig. 6.
Example 19:
a tunable all-solid-state white-light laser system, whose structure is shown in example 15, except that the operating power ratio of the blue LD and the self-frequency-doubled yellow laser is adjusted to make the peak intensity ratio 5: 5, denoted as B5-Y5, the chromaticity coordinates of the white light finally displayed in the standard chromaticity system 1931cie obtained by applying the chromaticity synthesis principle to the mixed laser light source are (0.412, 0.3489), as shown in fig. 6.
Example 20:
a tunable all-solid-state white-light laser system, whose structure is shown in example 15, except that the operating power ratio of the blue LD and the self-frequency-doubled yellow laser is adjusted to make the peak intensity ratio be 4: 5, denoted as B4-Y5, the chromaticity coordinates of the white light finally displayed in the standard chromaticity system 1931cie obtained by applying the chromaticity synthesis principle to the mixed laser light source are (0.418, 0.357), as shown in fig. 6.
The foregoing is a preferred embodiment of the present invention, and for the integration of the system, the optimization of the light beam combination based on the idea of combining the light source and the two-color laser into white light in this embodiment is within the protection scope of the present invention, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention.
Claims (10)
1. A tunable all-solid-state white light laser system is characterized by comprising a blue light LD, a self-frequency-doubling yellow light laser and a laser beam combining component, wherein light emitted by the blue light LD and light emitted by the self-frequency-doubling yellow light laser are combined by the laser beam combining component to form white light laser, the working wavelength of the blue light LD is 430-doped 450nm, and the working wavelength of the self-frequency-doubling yellow light laser is 560-doped 590 nm.
2. A tunable all-solid-state white light laser system according to claim 1, wherein the blue light emitted from the blue LD and the yellow light emitted from the self-frequency-doubled yellow laser are independently tunable, and different chromaticity adjustments of the white light of the system are achieved by controlling the power ratio and/or wavelength thereof.
3. The tunable all-solid-state white light laser system according to claim 1, wherein the laser beam combining component is a beam splitter component, the beam splitter component includes a beam splitter, the yellow light beam emitted from the self-frequency-doubling yellow laser is incident on the yellow reflecting mirror surface of the beam splitter at an incident angle of 45 °, the light path direction is changed by 90 °, and the yellow light beam is merged with the blue light beam emitted from the blue LD and perpendicular to the incident direction of the yellow light beam, and the beam splitter is fixedly installed at the perpendicular intersection of the blue light beam and the yellow light beam, and is 45 ° to the two incident light beams respectively.
4. The tunable all-solid-state white light laser system according to claim 1, wherein the laser beam combining component is an optical fiber beam combining component, the optical fiber beam combining component includes an optical fiber, two ports a located at a head end and a port B located at a tail end, the optical fiber is in a shape of a herringbone, one port a is connected with the blue LD, the other port a is connected with the self-frequency-doubling yellow laser, light emitted by the blue LD and light emitted by the self-frequency-doubling yellow laser are guided into the optical fiber, so that the blue light and the yellow light are mixed and combined in the optical fiber, and the mixed white light is directly output through the port B at the tail end of the optical fiber.
5. The tunable all-solid-state white light laser system according to claim 2, wherein the self-frequency-doubling yellow laser comprises a pump source, a focusing system, an input mirror, a laser self-frequency-doubling crystal and an output mirror, which are arranged in sequence, wherein the input mirror and the output mirror form a resonant cavity;
the laser self-frequency doubling crystal is one of calcium yttrium oxide borate, calcium lanthanum oxide borate and calcium gadolinium oxide borate or a mixed crystal of two or three of the calcium yttrium oxide borate, the calcium lanthanum oxide borate and the calcium gadolinium oxide borate;
the pumping source is a laser diode laser with the emission wavelength of 970-980 nm;
the light passing direction of the laser self-frequency doubling crystal is the phase matching direction of the self-frequency doubling crystal, namely cutting along the maximum direction of the effective nonlinear coefficient of a non-principal plane of the crystal, the laser self-frequency doubling crystal is plated with dielectric films which are highly transparent to excitation light, oscillation light and frequency doubling light, and an input mirror and an output mirror are respectively plated with cavity mirror dielectric films to realize stable output of yellow light with different wavelengths;
laser oscillation and nonlinear frequency conversion are generated through the laser self-frequency doubling crystal, pump light emitted by the pump source is collimated and focused through the focusing system and is injected into the laser self-frequency doubling crystal through the input mirror, the laser self-frequency doubling crystal absorbs pump light energy to generate base frequency light in the laser resonant cavity, and the base frequency light is subjected to frequency doubling by utilizing the frequency doubling effect of the laser self-frequency doubling crystal, so that yellow laser output with the working wavelength of 560 + 590nm is realized.
6. The tunable all-solid-state white light laser system according to claim 5, wherein the non-laser-active region of the laser self-frequency doubling crystal is provided with a crystal temperature control device for adjusting the crystal temperature.
7. The tunable all-solid-state white light laser system according to claim 6, wherein the crystal temperature control device is a semiconductor cooling plate, which is tightly attached to the non-laser-active region of the self-frequency-doubling crystal to stabilize the temperature of the laser self-frequency-doubling crystal at 5-30 ℃.
8. The tunable all-solid-state white-light laser system according to claim 5, wherein the self-frequency-doubling yellow-light laser further comprises a fine tuning device for adjusting the resonant cavity to move back and forth along the light path, the fine tuning device comprises two parallel slideways and a slide rod matched with the two slideways, the input mirror and the output mirror are respectively fixed on the two slide rods, the slide rod adjusts the moving distance of the slide rod on the slideways through a knob, thereby ensuring that the resonant cavity is fine-tuned after the cavity mirror coated with a specific dielectric film is replaced to realize the output of yellow-light laser with a specific wavelength.
9. The tunable all-solid-state white-light laser system according to claim 5, wherein the laser self-frequency doubling crystal is calcium-yttrium-oxide-borate with ytterbium ion doping concentration of 15% -30%;
the light-passing surface of the laser self-frequency doubling crystal is cylindrical or rectangular, and the length of the laser self-frequency doubling crystal in the light-passing direction is 4-20 mm.
10. The tunable all-solid-state white light laser system of claim 1, wherein the blue LD is LR-BSP-440/5-10W blue LD manufactured by vinpochroma radium optoelectronics ltd.
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| US9869442B2 (en) * | 2014-06-26 | 2018-01-16 | Texas Instruments Incorporated | Hybrid illumination system having a blue laser diode, dichroic mirror and yellow transmissive phosphor converter for generating white light |
| CN207602970U (en) * | 2017-12-01 | 2018-07-10 | 华侨大学 | A kind of white light laser |
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| US10541509B2 (en) * | 2016-01-28 | 2020-01-21 | Sony Corporation | Semiconductor light emitting device |
| DE102016206950B4 (en) * | 2016-04-25 | 2023-11-02 | Coretronic Corporation | Light module for providing high luminance light and lighting device with this light module |
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| US9869442B2 (en) * | 2014-06-26 | 2018-01-16 | Texas Instruments Incorporated | Hybrid illumination system having a blue laser diode, dichroic mirror and yellow transmissive phosphor converter for generating white light |
| CN207602970U (en) * | 2017-12-01 | 2018-07-10 | 华侨大学 | A kind of white light laser |
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