WO2020248558A1 - Système optique de source de lumière laser - Google Patents

Système optique de source de lumière laser Download PDF

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Publication number
WO2020248558A1
WO2020248558A1 PCT/CN2019/125972 CN2019125972W WO2020248558A1 WO 2020248558 A1 WO2020248558 A1 WO 2020248558A1 CN 2019125972 W CN2019125972 W CN 2019125972W WO 2020248558 A1 WO2020248558 A1 WO 2020248558A1
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WIPO (PCT)
Prior art keywords
light
specific wavelength
dichroic mirror
light source
optical system
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Application number
PCT/CN2019/125972
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English (en)
Chinese (zh)
Inventor
陈国平
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广州光联电子科技有限公司
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Publication of WO2020248558A1 publication Critical patent/WO2020248558A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/30—Elements containing photoluminescent material distinct from or spaced from the light source
    • F21V9/32—Elements containing photoluminescent material distinct from or spaced from the light source characterised by the arrangement of the photoluminescent material
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2013—Plural light sources
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2033—LED or laser light sources
    • G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2066—Reflectors in illumination beam

Definitions

  • the present invention relates to the technical field of laser light sources, and more specifically, to an optical system of laser light sources.
  • laser has the advantages of concentrated energy and good collimation, making laser lighting as a new light source gradually widely used in some special lighting fields, such as laser projection, stage lighting, urban landmark searchlights, etc. Whether it is the most widely used laser projection or other special lighting, to a large extent what is required is not a simple monochromatic laser light source, but a non-monochromatic light source such as white light.
  • Traditional technical means usually use the three primary colors of red, green and blue. This solution is not only costly, but also a strong coherent laser will produce a speckle effect, which will seriously affect the quality of lighting.
  • the prior art has begun to use blue lasers to excite phosphors to generate red light and green light, so that white light with better light quality can be obtained with relatively low cost.
  • the blue laser excitation phosphor solution is divided into two types: transmissive and reflective.
  • the transmissive solution has the advantage of higher optical efficiency.
  • the optical system after the phosphor is excited is simple and convenient for design and debugging.
  • the disadvantage is that it is limited by materials. It can only be used in a system with low blue illuminance per unit area.
  • the reflective scheme is just the opposite. As shown in Figure 2, it can be used in high-power laser light source systems. If the phosphor is applied to the color wheel device, the input blue light power can reach higher, but its optical efficiency does not have the transmissive scheme height of.
  • Figure 3 is a commonly used optical path design for the reflective scheme.
  • the blue light 401 emitted by the laser tube 6 passes through the reflector, the blue light 301 reflected by the blue and yellow dichroic mirror 11 is guided to the phosphor 8, and The transmitted blue light 302 is guided to the side of the Lambertian scatterer 9, and the yellow light 501 excited by the phosphor 8 penetrates the dichroic mirror 11 and merges with the blue light 303 reflected by the Lambertian scatterer 9 into a beam White light 7, at this time, part of the yellow light 501 is reflected to form the reflected yellow light 502, and part of the blue light 303 is transmitted through the dichroic mirror to form the transmitted blue light 304.
  • This solution uses a dichroic mirror to split and combine the incident blue light and the excited yellow light, so as to achieve the purpose of finally mixing into white light.
  • the disadvantage of this scheme is that it is subject to the requirements for the setting of the reflection/transmission ratio of the dichroic mirror, that is, it is necessary to ensure that the yellow light generated by the excited phosphor can be mixed with the corresponding blue and yellow light when it returns to the dichroic mirror.
  • the dichroic mirror sets a ratio of reflection/transmission of blue light. Basically, the sum of the ratio of reflected blue light R 1 and the ratio of transmitted blue light T 1 is 1. Generally, R 1 is about 80% and T 1 is about 20%.
  • the loss ratio of light output through the dichroic mirror is equivalent to the ratio of reflection/transmission set at the time of input.
  • the yellow light and blue light After the yellow light and blue light enter the dichroic mirror for the second time, there will be a certain proportion of loss, that is, the transmission and Part of the yellow light mixed with blue light is lost by reflection, namely yellow light 502, and part of the blue light that should be reflected and mixed with yellow light is lost by transmission, namely blue light 304.
  • the yellow light and blue light after the blue light is excited by phosphors are not efficient Output, resulting in lower optical efficiency.
  • the present invention provides a laser light source optical system, which improves the optical conversion efficiency of the laser light source mixing to generate white light without changing the original system optical path structure.
  • an optical system of a laser light source comprising a laser light source, a dichroic mirror, a wavelength conversion device and a Lambertian scatterer arranged in sequence, the dichroic mirror comprising
  • a regional reflective film is used to receive the first specific wavelength light emitted by the laser light source, and can completely reflect the first specific wavelength light irradiated on it.
  • the area reflection film includes a plurality of hollow transmission holes, part of the first specific wavelength light can be injected into the rear of the dichroic mirror through the transmission holes, and/or, the dichroic mirror does not completely block the first For light of a specific wavelength, part of the light of the first specific wavelength can enter the back of the dichroic mirror through the unshielded position of the dichroic mirror.
  • the wavelength conversion device is used for receiving the first specific wavelength light reflected by the area reflection film, converting it into a second specific wavelength light and reflecting back along the incident light path.
  • the area reflection film has a complete transmission function for the second specific wavelength light.
  • the Lambertian scatterer is used to make part of the light of the first specific wavelength transmitted by the dichroic mirror form a sub-Lambertian light source and reflect back along the incident light path.
  • the total reflection reflectance is higher than 95%, and the total transmission transmittance is higher than 95%.
  • the first specific wavelength light and the second specific wavelength light reflected by the Lambertian scatterer are mixed at the dichroic mirror, and white light can be generated when the ratio is appropriate.
  • Lambertian scatterer refers to the phenomenon that when the incident light is uniformly reflected in all directions, that is, the incident light is centered at the incident point, and the light is reflected isotropically to the surroundings in the entire hemispherical space.
  • diffuse reflection occurs on the Lambertian scatterer, forming a secondary light source that is different from the incident light, that is, the sub-Lambertian light source.
  • the dichroic mirror area reflective film sets the reflectance and transmittance of the first specific wavelength light, reflects most of the first specific wavelength light and transmits a small part of the first specific wavelength light, and finally realizes at the dichroic mirror Mixed into white light, in the process of multiple reflection and transmission, the light of the other kind is lost due to the choice of one of the reflected and transmitted light.
  • the principle that the technical solution of the present invention can reduce light loss is as follows: establish a rectangular coordinate system on the plane of the dichroic mirror, use the x-axis and y-axis as the horizontal and vertical axes, and set the first specific wavelength in the light beam emitted by the laser light source
  • the illuminance distribution curve of the first light irradiated on the plane of the dichroic mirror in the rectangular coordinate system is f(x,y)
  • the irradiation area is S 00
  • the optical power of the first specific wavelength light irradiated on the plane of the dichroic mirror is Q 0
  • Q 0 can be expressed as:
  • the optical power is the integral of the light distribution on the distribution area.
  • the two have provided a number of transmission holes pierced dichroic mirrors, the transmission area of each hole is respectively S 1, S 2, — S a, the first specific wavelength of light through the first region of the reflective film transmittance
  • the optical power Q 3 is:
  • the first specific wavelength light passes through the dichroic mirror and enters the side of the Lambertian scatterer.
  • Lambertian scatterer refers to the phenomenon that the incident light is uniformly reflected in all directions, that is, the incident light is centered at the incident point, and the light is reflected isotropically to the surroundings in the entire hemispherical space. It is also called Lambertian. When light is incident on the Lambertian scatterer, diffuse reflection occurs on the Lambertian scatterer, forming a secondary light source that is different from the incident light.
  • the first specific wavelength light passes through the dichroic mirror, and after being reflected on the side of the Lambertian scatterer, it enters the collimating system with a larger divergence angle, and after the collimating system, a larger cross-sectional area is formed
  • the light beam is irradiated on the dichroic mirror again, assuming that the first specific wavelength light with a larger cross-sectional area that is irradiated on the dichroic mirror again has the irradiation area of the dichroic mirror S 01 , S 01 Should be greater than S 00 .
  • the illuminance distribution curve of the dichroic mirror can be expressed as g(x,y), because S 01 > S 00 , and suppose that The total optical power of the first specific wavelength light with the larger cross-sectional area is Q 4 , and Q 4 is obviously smaller than Q 0 , therefore: g(x,y) ⁇ f(x,y), at this time, since S 01 >S 00 , the first specific wavelength light with a larger cross-sectional area irradiated on the dichroic mirror again completely covers the S 00 area, then the first specific wavelength light irradiated on the dichroic mirror again will also pass through the dichroic mirror The transmission hole on the reflective film in the mirror area causes a certain light loss, and the lost optical power at this time is Q S1 :
  • the number and size of the transmission holes are fixed. As the area of the light irradiated on the dichroic mirror increases, the transmittance will gradually decrease. Since S 01 > S 00 , therefore: ⁇ 1 > ⁇ 2 .
  • the dichroic mirror achieves the corresponding function by setting a ratio of reflection/transmission of light of a specific wavelength, so its transmittance is constant, set to ⁇ , and according to the same transmission of light of the first specific wavelength, it passes through Lambertian
  • the scatterer reflects and amplifies the first specific wavelength light transmitted from the dichroic mirror.
  • a second transmission occurs.
  • the first specific wavelength light and the second specific wavelength light require a certain ratio when mixing, under the same circumstances, the total area of the transmission hole of the present invention is within a certain range, let ⁇ 1 ⁇
  • the light power of the first specific wavelength light transmitted through the dichroic mirror for the first time in the prior art and the present invention is the same, and ⁇ 1 > ⁇ 2 , ⁇ 1 ⁇ , then the generated light
  • the loss Q S1 ⁇ Q S0 that is, under the same or similar conditions, the present invention has higher optical efficiency than the prior art.
  • all the light beams are within the range of the reflection film of the dichroic mirror region.
  • the dichroic mirror and the first specific wavelength light emitted by the laser light source are arranged at an angle of 45°.
  • optical axes of the first specific wavelength light reflected by the area reflection film and the first specific wavelength light emitted by the laser light source are perpendicular to each other.
  • the transmission holes are all located within the irradiation range when the light of the first specific wavelength is irradiated on the plane of the dichroic mirror for the first time.
  • the total area of the transmission hole can be set according to the mixing ratio of the first specific wavelength light and the second specific wavelength light reflected by the Lambertian scatterer at the dichroic mirror.
  • the ratio of the total area of the transmission hole to the irradiation area of the first specific wavelength light irradiated on the dichroic mirror plane for the first time after removing the total area of the transmission hole is equal to or approximately equal to the first specific
  • the ratio of the optical power of the two is equal to or approximately equal to the first specific
  • the total area of the transmission hole accounts for 30% to 36% of the irradiation area of the first specific wavelength light irradiated on the dichroic mirror plane for the first time, so that the first specific wavelength light and the second specific wavelength light When the light is mixed at the dichroic mirror, the ratio is about 1:2.
  • the light of the first specific wavelength is blue light, and the spectral range is 400-500 nm.
  • the total area of the transmission holes is constant, their number, single area, and shape are not limited.
  • the transmission hole is square or circular.
  • the transmission holes are a plurality of small holes with the same unit area, arranged in a regular shape.
  • the wavelength conversion device includes a wavelength converter, a reflecting mirror, and a collimating lens system, and the reflecting mirror is used to reflect the second specific wavelength light after the wavelength conversion by the wavelength converter to the incident light path.
  • the collimating lens system is composed of several condenser lenses.
  • the wavelength converter is a phosphor sheet.
  • the wavelength converter is a yellow phosphorous phosphor sheet
  • the second specific wavelength light is yellow light
  • the yellow light has a spectral component greater than 500 nm.
  • the area reflection film is a dielectric reflection film.
  • an optical system of a laser light source comprising a laser light source and a dichroic mirror arranged in sequence, characterized in that the dichroic mirror includes a regional reflection
  • the film is used to receive the first specific wavelength light emitted by the laser light source and completely reflect it.
  • the dichroic mirror does not completely block the first specific wavelength light, and part of the first specific wavelength light can pass through the dichroic mirror
  • the unshielded position is incident behind the dichroic mirror
  • the optical system of the laser light source also includes a wavelength conversion device for receiving the first specific wavelength light completely reflected by the area reflection film, and It is converted into the second specific wavelength light and then reflected back from the incident light path.
  • the area reflective film has a complete transmission function for the second specific wavelength light.
  • the optical system of the laser light source also includes a Lambertian scatterer for The part of the first specific wavelength light transmitted by the dichroic mirror forms a sub-Lambertian light source and reflects back along the incident light path.
  • the area reflection film includes a plurality of hollow transmission holes, part of the first specific wavelength light can be injected into the rear of the dichroic mirror through the holes.
  • the optical efficiency of the present invention is higher, and compared with the setting of the reflection/transmission ratio of the dichroic mirror in the prior art, the arrangement of the transmission hole in this solution reduces the process difficulty and improves the The flexibility of adjusting the light transmittance of the first specific wavelength.
  • Fig. 1 is a schematic diagram of wavelength conversion of a blue laser excited phosphor transmission scheme in the prior art.
  • Fig. 2 is a schematic diagram of wavelength conversion of a blue laser excitation phosphor reflection type scheme in the prior art.
  • FIG. 3 is a schematic diagram of an optical system of one of the blue laser excitation phosphor reflective solutions in the prior art.
  • Fig. 4 is a schematic diagram of an optical system according to the first embodiment of the present invention.
  • FIG. 5 is a schematic diagram of a transmission hole and a part of an enlarged view of a regional reflective film according to the present invention.
  • FIG. 6 is a schematic diagram of the transmission hole and part of the second-region reflective film in the implementation of the present invention.
  • FIG. 7 is a schematic diagram of the transmission hole and part of the three-region reflective film according to the present invention.
  • this embodiment provides an optical system for a laser light source, which includes laser light sources 601, 602, 603, and 604 arranged in sequence, corresponding to the laser light source one by one and at a 45° angle to the emitted laser light.
  • the dichroic mirror 111 includes a regional reflective film 151 for receiving the blue light 401 emitted by the laser light sources 601, 602, 603, and 604, and Reflect it completely, the blue light 401 and the dichroic mirror 111 are arranged at an angle of 45°, the blue light reflected by the regional reflective film 151 is perpendicular to the received blue light 401, and the regional reflective film 151 includes a number of hollow transmission holes 161, all located in the blue light Within the irradiated range of 401, part of the blue light 401 can be injected 161 into the back of the dichroic mirror 111 through the transmission hole.
  • the optical system of the laser light source also includes a wavelength conversion device for receiving the reflection from the area.
  • the film 151 completely reflects the blue light after the blue light 401, and converts it into yellow light and then reflects back on the incident light path.
  • the area reflective film 151 has a complete transmission function for yellow light.
  • the optical system of the laser light source also includes a lang
  • the Burbert scatterer 901 is used to scatter part of the blue light 401 transmitted by the dichroic mirror 111 by Lambertian scatter. There is a collimating system between the Lambertian scatterer 901 and the dichroic mirror 111, including condenser lenses 133 and 134.
  • the wavelength conversion device includes a wavelength converter, a reflecting mirror 801 and condenser lenses 131, 132.
  • the wavelength converter is a yellow phosphorous phosphor sheet attached to the reflecting mirror 801.
  • the reflecting mirror 801 is used to convert the wavelength by the wavelength converter.
  • the condenser lenses 131 and 132 are used to form a collimating system to converge parallel or near-parallel light, and diverge the reflected yellow light into parallel or near-parallel light.
  • the shape of the transmission holes 161 is circular. As shown in FIG. 5, the transmission holes 161 are regularly arranged in a matrix shape on the regional reflection film 151.
  • the yellow light reflected by the reflecting mirror 801 and the blue light amplified by the Lambertian scatterer 901 are mixed at the dichroic mirror 111 to produce white light, which is emitted along the optical axis 142.
  • the second embodiment is basically the same as the first embodiment.
  • the difference is that the shape of the transmission holes 161 is square.
  • the transmission holes 162 are regularly arranged in a matrix shape on the regional reflection film 152.
  • the third embodiment is basically the same as the first embodiment.
  • the difference is that the shape of the transmission holes 163 is an unconventional pattern similar to a four-pointed star. As shown in FIG. 7, the transmission holes 163 are regularly arranged in a matrix shape on the regional reflective film 153.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Multimedia (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Projection Apparatus (AREA)

Abstract

La présente invention concerne un système optique d'une source de lumière laser, comprenant des sources de lumière laser (601-604), un miroir dichroïque (111), un dispositif de conversion de longueur d'onde et un diffuseur de type Lambert (901) qui sont agencés les uns à la suite des autres. Le miroir dichroïque (111) comprend des films de réflexion de zone (151, 152, 153) capables de réfléchir totalement une première lumière à longueur d'onde spécifique émise par la source de lumière laser et irradiée sur ceux-ci ; les films de réflexion de zone (151, 152, 153) sont pourvus de plusieurs trous de transmission creux (161, 162, 163) pour permettre à une partie de la première lumière à longueur d'onde spécifique de passer à travers les trous (161, 162, 163) ; le dispositif de conversion de longueur d'onde est utilisé pour convertir la première lumière à longueur d'onde spécifique reçue en une seconde lumière à longueur d'onde spécifique et la réfléchir ; et le diffuseur de type Lambert (901) est utilisé pour permettre à la première lumière à longueur d'onde spécifique transmise par le miroir dichroïque (111) de former une source de lumière de type Lambert secondaire et la réfléchir. La première lumière à longueur d'onde spécifique et la seconde lumière à longueur d'onde spécifique réfléchie par le diffuseur de type Lambert (901) sont mélangées au niveau du miroir dichroïque (111), et peuvent générer une lumière blanche lorsqu'elles sont à un rapport approprié. Par rapport à l'état de la technique, l'efficacité optique est plus élevée, la difficulté de traitement est réduite, et la flexibilité d'ajustement de la transmittance du miroir dichroïque (111) pour la première lumière à longueur d'onde spécifique est améliorée.
PCT/CN2019/125972 2019-06-13 2019-12-17 Système optique de source de lumière laser WO2020248558A1 (fr)

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CN110347009A (zh) * 2019-06-13 2019-10-18 广州光联电子科技有限公司 一种激光光源的光学系统
CN113835285A (zh) * 2020-06-08 2021-12-24 深圳光峰科技股份有限公司 光源结构及投影设备
CN112162356B (zh) * 2020-09-29 2023-06-27 武汉中科医疗科技工业技术研究院有限公司 光耦合装置、光源系统及其光通量的控制方法
CN112628621A (zh) * 2021-01-14 2021-04-09 苏州视奥光电科技有限公司 激光发光光源装置
CN113057592B (zh) * 2021-03-18 2022-11-01 南京诺源医疗器械有限公司 一种光源混合装置及混合方法

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