CN212657601U - Laser light emitting device - Google Patents

Laser light emitting device Download PDF

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Publication number
CN212657601U
CN212657601U CN202020823073.1U CN202020823073U CN212657601U CN 212657601 U CN212657601 U CN 212657601U CN 202020823073 U CN202020823073 U CN 202020823073U CN 212657601 U CN212657601 U CN 212657601U
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light
wavelength conversion
laser
conversion device
beam splitter
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CN202020823073.1U
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Chinese (zh)
Inventor
赫尔曼·友瀚·范·贝赫库姆
郑华
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He ErmanYouhanFanBeihekumu
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He ErmanYouhanFanBeihekumu
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/64—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/69—Details of refractors forming part of the light source
    • 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
    • F21V5/00—Refractors for light sources
    • F21V5/04—Refractors for light sources of lens shape
    • 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
    • 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
    • F21V9/40—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters with provision for controlling spectral properties, e.g. colour, or intensity
    • F21V9/45—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters with provision for controlling spectral properties, e.g. colour, or intensity by adjustment of photoluminescent elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0938—Using specific optical elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Projection Apparatus (AREA)

Abstract

The utility model provides a laser illuminator, a serial communication port, including laser light source, polarization beam splitter, wave plate, spotlight component, wavelength conversion equipment, spotlight part. The utility model provides a pair of laser illuminator has characteristics such as luminance height, optical expansion volume are little, simple structure, the facula is even, long service life, efficient. The utility model discloses in can being applicable to the system that needs high illumination intensity and little optical expansion, for example amusement lighting system, projection system, automotive lighting system, medical lighting system, searchlighting lighting system, field work lighting system, navigation lighting system, portable lighting system etc..

Description

Laser light emitting device
Technical Field
The utility model belongs to the field of lighting, especially, belong to solid state light source illumination field. The utility model provides a pair of laser illuminator is applicable in the system that needs high illumination intensity and little optical expansion volume, for example amusement lighting system, projection system, automotive lighting system, medical lighting system, searchlight lighting system, field operation lighting system, navigation lighting system, portable lighting system etc..
Background
The laser is an ideal point light source, and has the advantages of small optical expansion, long service life, no mercury and the like. The fluorescent material can be used as a light source to excite the fluorescent body to generate color light or white light, and an ideal light-emitting device with small optical expansion can be obtained by matching the optical element.
The existing polarization beam splitting laser light-emitting device has two schemes: a multi-color wheel scheme and a single-color wheel scheme. In the multi-color fluorescent wheel scheme, the wavelength conversion device used is a dynamic fluorescent wheel and the fluorescent wheel has different sectors, which are respectively a diffuse reflection sector and a single or multiple phosphor sectors, as shown in fig. 1 and 2, fig. 1 shows a fluorescent wheel with 2 different sectors (wherein, B is a blue light diffuse reflection sector, Y is a yellow phosphor sector), and fig. 2 shows a fluorescent wheel with 3 different sectors (wherein, B is a blue light diffuse reflection sector, R is a red phosphor sector, and G is a green phosphor sector). When blue laser is injected into the fluorescent wheel and the fluorescent wheel rotates to the diffuse reflection sector, the blue light is reflected back to the original optical path, when the blue laser is injected into the fluorescent wheel and the fluorescent wheel rotates to the fluorescent sector, the blue light can excite the fluorescent body on the sector, so that laser light (such as yellow light) is generated, yellow light is also injected back to the original optical path from the fluorescent wheel, and then the yellow light and the blue light can be alternately emitted through high-speed rotation of the fluorescent wheel. This has the advantage of a simple design of the light path, since each light of a different color is emitted from the fluorescent wheel back into the same light path, and thus only a single light path is usually required to achieve white light output. However, this method has a great disadvantage that, for example, when a high frame rate camera or a high frame rate video camera is used for shooting or recording, blue light and yellow light may be recorded alternately, so that some stroboscopic phenomenon that the blue light and the yellow light alternately appear in the video can be observed. In most stage lighting situations, the recording of shows is common, so that cameras are used, and the alternating presence of different colors may be recorded, which is unacceptable. For example, some people may perceive color changes more frequently than normal people, and thus they may see blue light and yellow light alternately, which is unacceptable. To solve this problem, a single-color fluorescent wheel scheme is generally adopted, which is different from a multi-color fluorescent wheel scheme in that the fluorescent wheel has no different sectors, but only one fluorescent region, which emits light of a certain color after being excited, and thus, one or more additional light beams are required to be mixed with the fluorescent region to form white light. For example, when blue laser light enters the phosphor region of the fluorescent wheel, the blue light can excite the phosphor on the fluorescent wheel to generate excited light (such as yellow light), and the yellow light is emitted from the fluorescent wheel back to the original light path, and then mixed with another path of blue light to form white light and output the white light. Although the single-color fluorescent wheel scheme can avoid the situation that light rays with different colors appear alternately, the light path of the single-color fluorescent wheel scheme becomes more complicated, the single light path cannot be realized generally, one or more light paths need to be added, and then white light output is realized through light mixing. The single-color fluorescent wheel scheme has high requirements on light mixing of light rays with different colors, particularly has very high requirements on optical design and manufacturing precision of a light mixing part, and has the problems of poor light mixing, color difference and the like if the processing is not good.
Disclosure of Invention
The to-be-solved technical problem of the utility model is: the situation that light rays with different colors are alternately generated due to the fact that the existing multi-color fluorescent wheel scheme uses the fluorescent wheels with a plurality of different sectors is avoided, and meanwhile the structure of a plurality of relatively complex light paths in the existing single-color fluorescent wheel scheme is avoided.
In order to solve the technical problem, the technical scheme of the utility model a laser illuminator is provided, it has both kept simple light path structure, the condition that the light of different colours appears in turn can not have simultaneously again, its characterized in that, including laser source, polarization beam splitter, wave plate, condensing element, wavelength conversion equipment, spotlight part.
The laser light emitted by the laser light source includes a first color light which is S-polarized light or P-polarized light relative to the incident plane of the polarization beam splitter, and the first color light is generated by one or more lasers inside the laser light source. All of these lasers may be placed randomly or in an array.These lasers emit light having a central wavelength at λ1～λ2Which is capable of exciting the wavelength conversion device.
Defining an optical path between the polarization beam splitter and the wavelength conversion device as a first optical path, wherein:
the polarization beam splitter makes the wavelength at lambda1～λ2Reflecting the light with S-polarized light relative to its incident surface to make the wavelength at lambda1～λ2A light ray having P-polarized light with respect to its incident surface is transmitted to make the wavelength longer than lambda2Is transmitted or reflected. The polarizing beam splitter may be cube-type or plate-type and reflects or transmits incident light depending on its wavelength and polarization direction. The first color light beam emitted by the laser source and including S-polarized light or P-polarized light with respect to the incident plane of the polarization beam splitter is emitted to the polarization beam splitter, and the polarization beam splitter can reflect the S-polarized light within a certain wavelength range and transmit the P-polarized light within a certain wavelength range.
In particular, when the polarization splitter makes the wavelength longer than λ2When visible light rays are transmitted:
the laser source emits a first color light beam including S-polarized light relative to the incident plane of the polarization beam splitter, and the central wavelength of the first color light beam is lambda1～λ2And the first color light emitted by the laser light source is emitted to the polarization beam splitter.
The polarization beam splitter will be S-polarized light with respect to its incident surface and have a wavelength at λ1～λ2The first color light rays in between are reflected into the first light path.
The light condensing element is located on the first light path, and is used for condensing the first color light reflected into the first light path from the polarization beam splitter to the wavelength conversion device, and simultaneously, for collimating the light reflected into the first light path from the wavelength conversion device and then emitting the light to the polarization beam splitter along the first light path.
The wavelength conversion device is reflective, after absorbing a part of the first color light reflected into the first optical path from the polarization splitter, the wavelength conversion device is excited to generate second color light, the central wavelength of the second color light is longer than that of the first color light, and the second color light and the first color light which is not absorbed by the wavelength conversion device emit from the wavelength conversion device to the polarization splitter along the first optical path.
A conventional structure of a wavelength conversion device in the present invention includes a reflective substrate and a wavelength conversion material provided on the reflective substrate. The wavelength conversion device is static or dynamic. When the wavelength conversion device is a dynamic device, the wavelength conversion device is a rotatable fluorescent wheel and the fluorescent wheel has only a fluorescent body region capable of reflecting light. The phosphor region may be only one, in which case the phosphor region is excited to generate the second color light, and the phosphor region may also reflect the first color light that is not absorbed by the wavelength conversion device. It is also possible to physically separate the phosphor regions into two or more, but it should be noted that all of the phosphor regions are excited to produce light of the same color, i.e., light of the second color.
The wave plate is located on the first optical path and is used for enabling the polarization direction of the first color light which is obtained by the wavelength conversion device and reaches the polarization beam splitter along the first optical path and is not absorbed by the wavelength conversion device to be different from the polarization direction of the first color light reflected into the first optical path from the polarization beam splitter.
The light from the wavelength conversion device to the polarization beam splitter along the first light path is transmitted by the polarization beam splitter and then emitted to the light-gathering part, and the light is converged by the light-gathering part and then emitted from the laser light-emitting device.
When the polarization beam splitter makes the wavelength longer than lambda2When visible light rays are reflected:
the laser source emits a first color light beam containing P polarized light relative to the incident plane of the polarization beam splitter, and the central wavelength of the first color light beam is lambda1～λ2And the first color light emitted by the laser light source is emitted to the polarization beam splitter.
The polarization beam splitter will be P-polarized with respect to its incident plane and have a wavelength at λ1～λ2The first color light is transmitted into the first optical path.
The light condensing element is located on the first light path, and is used for condensing the first color light transmitted into the first light path from the polarization beam splitter to the wavelength conversion device, and simultaneously, for collimating the light reflected into the first light path from the wavelength conversion device and then emitting the light to the polarization beam splitter along the first light path.
The wavelength conversion device is reflective, after absorbing the first color light transmitted into the first optical path from the polarization splitter, the wavelength conversion device is excited to generate second color light, the central wavelength of the second color light is longer than that of the first color light, and the second color light and the first color light which is not absorbed by the wavelength conversion device emit to the polarization splitter from the wavelength conversion device along the first optical path.
A conventional structure of a wavelength conversion device in the present invention includes a reflective substrate and a wavelength conversion material provided on the reflective substrate. The wavelength conversion device is static or dynamic. When the wavelength conversion device is a dynamic device, the wavelength conversion device is a rotatable fluorescent wheel and the fluorescent wheel has only a fluorescent body region capable of reflecting light. The phosphor region may be only one, in which case the phosphor region is excited to generate the second color light, and the phosphor region may also reflect the first color light that is not absorbed by the wavelength conversion device. It is also possible to physically separate the phosphor regions into two or more, but it should be noted that all of the phosphor regions are excited to produce light of the same color, i.e., light of the second color.
The wave plate is located on the first optical path and is used for enabling the polarization direction of the first color light which is obtained from the wavelength conversion device and reaches the polarization beam splitter along the first optical path and is not absorbed by the wavelength conversion device to be different from the polarization direction of the first color light which is transmitted into the first optical path from the polarization beam splitter.
The light from the wavelength conversion device to the polarization beam splitter along the first light path is reflected by the polarization beam splitter and then emitted to the light-gathering part, and the light is converged by the light-gathering part and then emitted from the laser light-emitting device.
Preferably, the laser light source includes a laser and a collimating element therein:
the light emitted by the laser is linearly polarized light;
the collimating element can be integrated in the laser, and when the collimating element is not integrated in the laser, a collimating element (e.g. a collimating lens) can be added outside the laser, and the collimating element is used for collimating light.
Preferably, the laser light source further comprises a lens group for reducing the beam, all the light generated by the laser enters the lens group, and the first color light transmitted from the lens group is the first color light emitted by the laser light source.
In addition to the laser, lens set, and collimating element, as noted above, the laser source may also include other optical elements (e.g., mirrors) within the laser source that may be used to collect the light emitted from the laser and direct it to the polarizing beam splitter.
Preferably, the light-concentrating element is constituted by at least one optical element having collimating properties, such as a lens or a compound parabolic concentrator or a tapered light guide, or by any combination between the above mentioned optical elements.
Preferably, the light-gathering component is composed of at least one first lens, and is used for converging and emitting originally parallel or divergent light rays.
Preferably, a light uniformizing device is disposed between the laser light source and the polarization beam splitter, and is configured to uniformize the first color light emitted from the laser light source. The light uniformizing device can be a diffusion sheet, a compound eye lens group, a light guide column or other optical elements with the light uniformizing function, and can uniformize laser spots converged on the wavelength conversion device, so that the wavelength conversion material on the wavelength conversion device is not easily burnt by laser light and the efficiency of the wavelength conversion material can be improved.
Preferably, a second lens is disposed between the laser light source and the light uniformizing device or between the light uniformizing device and the polarization beam splitter, and is configured to converge the first color light emitted from the laser light source to the polarization beam splitter. The laser spot converged on the wavelength conversion device can be enlarged by using the second lens, so that the wavelength conversion material on the wavelength conversion device is not easily burnt by laser rays and the efficiency of the wavelength conversion material can be improved. Meanwhile, the second lens can also converge the first color light rays diffused by using the light homogenizing device, so that light loss caused by light ray diffusion is reduced.
Preferably, a light guide column is disposed between the light-gathering element and the wavelength conversion device, and is used for uniformly distributing the first color light emitted from the polarization beam splitter to the wavelength conversion device.
Preferably, the light guide column is a solid structure light guide column or a hollow structure light guide column.
Preferably, a heat sink for dissipating heat of the laser light source and/or the wavelength conversion device is further included.
Another technical solution of the present invention is to provide an application of the above-mentioned laser light emitting device in an entertainment lighting system.
For reference and clarity, the terms used in the present invention are described as follows:
wavelength conversion material: the wavelength conversion material may be a phosphorescent material or a fluorescent material. Such as phosphors, fluorescent ceramics, luminescent crystals, scintillation crystals, and the like.
Excitation light: the wavelength converting material can be excited such that the wavelength converting material produces light of a longer wavelength.
Receiving laser: the wavelength conversion material is excited by the excitation light to generate light.
Based on the above description to technical noun, the utility model discloses a theory of operation and working process are:
the utility model discloses an use polarization beam splitter, include that the incident surface that includes to polarization beam splitter is S polarized light or P polarized light to laser source sent and make it penetrate into first light path through reflection or transmissive mode. The polarization beam splitter reflects S-polarized light in a certain wavelength range and transmits P-polarized light in a certain wavelength range. In the first light path, the first color light is converged on the wavelength conversion device through the light condensation element, the first color light excites the wavelength conversion material on the wavelength conversion device to enable the wavelength conversion material to emit second color light, the second color light and the first color light which is not absorbed by the wavelength conversion device are reflected back to the first light path from the wavelength conversion device and return to the polarization beam splitter after being collimated by the light condensation element, the first light path is internally provided with a wave plate, and in the process, the first color light which is not absorbed by the wavelength conversion device passes through the wave plate twice, so that the polarization direction of the first color light is changed. The first color light and the second color light of the first light path are transmitted or reflected by the polarization beam splitter, then emitted to the light-gathering part, converged by the light-gathering part, and then emitted from the laser light-emitting device.
In the prior art, in a structure of a single optical path similar to the present invention (corresponding to the first optical path in the present invention), the wavelength conversion device employs a dynamic fluorescent wheel having a plurality of sectors capable of rotating at high speed, wherein the sectors are generally divided into a diffuse reflection sector and a phosphor sector. The diffusely reflective sector can reflect incident excitation light (e.g., blue light), while the phosphor sector can convert the excitation light to another color of stimulated light (e.g., yellow light). The blue light and the yellow light are emitted back to the original light path from the fluorescent wheel, then the yellow light and the blue light can be alternately emitted through the high-speed rotation of the fluorescent wheel, the alternating frequency of the yellow light and the blue light is very high due to the very fast rotation speed of the fluorescent wheel, and the colors can be automatically mixed because human eyes cannot recognize the color change higher than a certain frequency, so that the color seen by people is the mixed light of the blue light and the yellow light, namely the white light. A drawback of this structure is that in some cases, the alternating appearance of yellow and blue light is observed, which is unacceptable. In order to solve this problem, a common conventional method is to use a fluorescent wheel without different sectors, and since there is only one fluorescent region on the fluorescent wheel, it only emits one color of light after being excited, which requires another light path or multiple light paths to be mixed with the light path or multiple light paths to form white light, which constitutes a multi-light path structure. For example, when blue laser light enters the phosphor region of the fluorescent wheel, the blue light can excite the phosphor on the fluorescent wheel to generate excited light (such as yellow light), and the yellow light is emitted from the fluorescent wheel back to the original light path, and then mixed with another path of blue light to form white light and output the white light. Although the multi-light path system can avoid the situation that the light rays with different colors appear alternately, the light path is more complicated, the requirements on the light mixing of the light rays with different colors are higher, particularly the requirements on the optical design and the manufacturing precision of a light mixing part are very high, and if the processing is not good, the problems of poor light mixing, color difference and the like exist.
The utility model discloses a wavelength conversion device's that technical scheme used conventional structure includes the reflection substrate and sets up the wavelength conversion material on the reflection substrate. The wavelength conversion device of the present invention may be static or dynamic, and when the wavelength conversion device is dynamic, the wavelength conversion device is a rotatable fluorescent wheel and the fluorescent wheel does not have different sectors. The operation principle is two, one is that the excitation light (such as blue light) converged on the wavelength conversion material is more than the excitation light capable of being absorbed and converted by the wavelength conversion material on the region, the wavelength conversion material is excited to generate stimulated light (such as yellow light), and the rest of the excitation light which is not absorbed by the wavelength conversion material and the stimulated light are emitted back to the first light path from the wavelength conversion device together. Another is to incorporate reflective particles in the wavelength converting material (e.g. yellow phosphor) which will reflect part of the incident excitation light back into the first light path. In this case, the light emitted from the wavelength conversion device back to the first optical path is a mixture of the excitation light and the stimulated light (e.g., a mixture of blue light and yellow light), and the mixture may form white light. The technical scheme of the utility model the inside reflection particle who mixes of reflection substrate and/or wavelength conversion material that has utilized wavelength conversion device reflects partial exciting light to both avoided using the dynamic fluorescence wheel that has different sectors, also can use static wavelength conversion device, the condition that just so can not have the light of different colours to appear in turn has taken place. And simultaneously, the technical scheme of the utility model single light path structure has also been kept for whole optical system's structure is comparatively simple, easily designs and makes.
It should be noted that, neither reflection nor transmission is 100%, and reflection or transmission of more than 80% is generally within an acceptable range according to the specification of an actual component.
The light emitted by the laser in the laser source may excite the wavelength converting material on the wavelength converting device to emit stimulated light, in other words, it may be absorbed by the wavelength converting material to emit stimulated light. Because the laser is arranged in the laser source and the light emitted by the laser is linearly polarized light, the laser source capable of emitting the light which is S polarized light or P polarized light relative to the incident plane of the polarization beam splitter can be obtained by reasonably placing the laser.
Meanwhile, because the optical element inside the laser light source can collimate the light (the optical element used here can be a collimating lens), a laser light source which can emit nearly parallel light can be obtained.
The light emitted from the laser source is directed to a polarization beam splitter, which reflects S-polarized light and transmits P-polarized light in a certain wavelength range, and transmits or reflects visible light having a wavelength longer than the longest wavelength in the wavelength range. For example, when a narrow band polarizing beamsplitter is used, it reflects S-polarized blue light with a wavelength between 440 and 470nm, transmits P-polarized blue light with a wavelength between 440 and 470nm, and transmits visible light with a wavelength longer than 470 nm. For another example, when another narrow band polarizing beam splitter is used, it reflects S-polarized blue light with a wavelength between 440 and 470nm, transmits P-polarized blue light with a wavelength between 440 and 470nm, and reflects visible light with a wavelength longer than 470 nm. Both of these narrow band polarizing beamsplitters have particular application in the latter embodiment.
The polarization beam splitter can reflect S-polarized light and transmit P-polarized light in a certain wavelength range. The light emitted by the laser source is directed to a polarization beam splitter, wherein S-polarized light or P-polarized light in this wavelength range is incident on the first optical path.
First light path: the S-polarized light or the P-polarized light emitted by the laser light source is incident on the first optical path, and then the polarization state of the S-polarized light or the P-polarized light is changed by the wave plate, specifically, the S-polarized light or the P-polarized light is changed into circularly polarized light. For example, with the quarter-wave plate, the angle between the polarization plane of the incident linearly polarized light and the fast axis or the slow axis of the quarter-wave plate is 45 °, so that the linearly polarized light becomes circularly polarized light after passing through the quarter-wave plate. The light is converged on the wavelength conversion device by the light condensing element. The wavelength conversion device is reflective and includes a reflective substrate and a wavelength conversion material disposed on the reflective substrate. After a part of the excitation light is absorbed by the wavelength conversion material on the wavelength conversion device, the wavelength conversion material emits excited light with a longer wavelength. The excited light and the excitation light not absorbed by the wavelength conversion material are emitted from the wavelength conversion device back to the first optical path. When the excitation light not absorbed by the wavelength conversion material passes through the wave plate for the second time, the circularly polarized light is changed into P polarized light or S polarized light.
The light condensing element collimates the light reflected back from the wavelength conversion device into near-parallel light. In the first optical path, the excitation light (S-polarized light or P-polarized light) that is not absorbed by the wavelength conversion material passes through the wave plate twice, and the polarization direction thereof changes, specifically, from the original S-polarized light to the P-polarized light or from the original P-polarized light to the S-polarized light.
The light of the first light path is transmitted or reflected by the polarization beam splitter and then emitted to the light-gathering part, and the light is converged by the light-gathering part and then emitted from the laser light-emitting device.
The utility model provides a pair of laser illuminator has characteristics such as luminance height, optical expansion volume are little, simple structure, the facula is even, long service life, efficient. The utility model discloses in can being applicable to the system that needs high illumination intensity and little optical expansion, for example amusement lighting system, projection system, automotive lighting system, medical lighting system, searchlighting lighting system, field work lighting system, navigation lighting system, portable lighting system etc..
Drawings
FIG. 1 is a schematic diagram of a fluorescent wheel with 2 different sectors;
FIG. 2 is a schematic diagram of a fluorescent wheel with 3 different sectors;
FIG. 3 is a schematic structural diagram of a dynamic wavelength conversion device used in embodiments 1 to 5;
FIG. 4 is a schematic structural diagram of a static wavelength conversion device used in embodiments 1 to 5;
fig. 5 and 6 are schematic structural views of a laser light source according to a first embodiment used in embodiments 1 to 5;
FIG. 7 is a schematic structural view of a laser light source of a second embodiment used in examples 1 to 5;
fig. 8 is a schematic structural view of a laser light-emitting device disclosed in embodiment 1;
fig. 9 is a schematic structural view of a laser light-emitting device disclosed in embodiment 2;
fig. 10 is a schematic structural view of a laser light-emitting device disclosed in embodiment 3;
fig. 11 is a schematic structural view of a laser light-emitting device disclosed in embodiment 4;
fig. 12 is a schematic structural diagram of a laser light emitting device disclosed in embodiment 5.
Detailed Description
The present invention will be further described with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes and modifications of the present invention may be made by those skilled in the art after reading the teachings of the present invention, and these equivalents also fall within the scope of the appended claims.
Any of the laser light emitting devices disclosed in all the following embodiments may employ a dynamic wavelength conversion device as shown in fig. 3, which is a rotatable fluorescent wheel and only has a fluorescent body region W capable of reflecting light, the fluorescent body region W includes a reflective substrate and a wavelength conversion material disposed on the reflective substrate, the fluorescent body region W is excited to generate stimulated light, and the fluorescent body region W can reflect light (including stimulated light and unabsorbed stimulated light).
Any of the laser light emitting devices disclosed in all of the following embodiments may also employ a static wavelength conversion device as shown in fig. 4, which includes a reflective substrate 1051 on which a wavelength conversion material 1052 is disposed on the reflective substrate 1051. The wavelength converting material 1052 is used for stimulated generation of stimulated light. The reflective substrate 1051 is used to reflect light (including stimulated and unabsorbed excitation light).
Any of the laser light emitting devices disclosed in all the following embodiments may employ the laser light source having the first structure shown in fig. 5 and 6, or may employ the laser light source having the second structure shown in fig. 7.
Fig. 5 and 6 are schematic structural diagrams of the laser light source of the first embodiment. As shown in fig. 5 and 6, the laser light source includes N lasers 1011, and the light emitted by the lasers 1011 is linearly polarized light, and the light emitting direction and the polarization direction of all the lasers 1011 are the same. When the laser 1011 is placed, the light emitted from the laser light source is S-polarized light or P-polarized light with respect to the incident surface of the polarization beam splitter (fig. 5 and 6 only show the case where the light emitted from the laser light source is S-polarized light with respect to the incident surface of the polarization beam splitter, but this structure is also applicable to the case where the light emitted from the laser light source is P-polarized light with respect to the incident surface of the polarization beam splitter). Therefore, with the structure shown in fig. 5 and 6, a light source including light having S-polarized light or P-polarized light with respect to the incident surface of the polarization beam splitter of any of the following embodiments can be obtained.
Fig. 7 is a schematic structural diagram of a laser light source of the second embodiment. The laser light source shown in fig. 7 differs from the laser light sources shown in fig. 5 and 6 in that a lens group 1013 is additionally provided. Lens assembly 1013 may be used to narrow the beam, which may make the overall device smaller and more compact.
Example 1
As shown in fig. 8, a blue light (with a central wavelength of 460nm) laser and a collimating lens are disposed in the laser source 101, wherein the light emitting directions and the polarization directions of all the lasers are the same, and when the laser source 101 is disposed, the polarization direction of the light emitted by the laser source is S-polarized light relative to the incident surface of the polarization beam splitter 102, so that the laser source 101 can emit near-parallel blue light (with a central wavelength of 460nm) and emit the blue light to the polarization beam splitter 102, and the light includes S-polarized light relative to the incident surface of the polarization beam splitter 102. The polarizing beam splitter 102 is a narrow-band (440-470nm) polarizing cube beam splitter, and for blue light (with a central wavelength of 460nm), the polarizing beam splitter 102 can reflect the S-polarized light and transmit the P-polarized light, and for visible light with a wavelength longer than 470nm (such as yellow light), the polarizing beam splitter 102 can transmit the light. The polarization beam splitter 102 reflects the incident S-polarized light to the first optical path.
In the first path, the polarization splitter 102 reflects the S-polarized blue light (with a center wavelength of 460nm) to the wave plate 103, where the wave plate 103 is a quarter wave plate, which can change its polarization state for the blue light (with a center wavelength of 460 nm). When the S-polarized blue light is incident to the wave plate 103, the included angle between the polarization plane of the S-polarized blue light and the fast axis or the slow axis of the wave plate 103 is 45 degrees, so that the polarization state of the S-polarized blue light is changed after the S-polarized blue light passes through the wave plate 103, and the S-polarized blue light is changed into circularly polarized blue light. The circularly polarized blue light transmitted through the wave plate 103 reaches the light-collecting element 104, where the light-collecting element 104 is a collimating lens group, which can converge the circularly polarized blue light to the wavelength conversion device 105. The wavelength conversion device 105 is reflective and includes a reflective substrate and a wavelength converting material (e.g., a yellow phosphor patch) disposed on the reflective substrate. The wavelength conversion device 105 may employ a rotatable fluorescent wheel as shown in fig. 3, in which case the phosphor region W of the fluorescent wheel includes a reflective substrate and a wavelength conversion material disposed on the reflective substrate. The wavelength conversion device 105 may also be of a static configuration as shown in fig. 4. Part of the circularly polarized blue light is absorbed by the wavelength conversion material on the wavelength conversion device 105 and converted into yellow light, the circularly polarized blue light and the yellow light which are not absorbed by the wavelength conversion material are emitted back to the first light path from the wavelength conversion device 105, the light rays are collimated by the light condensing element 104 and emitted to the wave plate 103, after the circularly polarized blue light emitted back to the first light path passes through the wave plate 103, the polarization state of the circularly polarized blue light is changed into P polarized light from original circularly polarized light, and finally, the mixed light emitted from the wave plate 103 contains the yellow light and the P polarized blue light and is emitted to the polarization beam splitter 102. Since the polarization beam splitter 102 is a narrow-band polarization beam splitter, for blue light (with a central wavelength of 460nm), the polarization beam splitter 102 can reflect S-polarized light and transmit P-polarized light, and for yellow light, the polarization beam splitter 102 can transmit the yellow light, so that both yellow light and P-polarized blue light in the mixed light can transmit through the polarization beam splitter 102, and the mixed light of yellow light and blue light is white light. The white light is emitted to the light-gathering component 106, wherein the light-gathering component 106 is a focusing lens, and finally the light is converged by the light-gathering component 106 and then emitted from the laser light-emitting device disclosed in the embodiment.
Example 2
As shown in fig. 9, the present embodiment is different from embodiment 1 in that: the polarizing beam splitter 102 of the present embodiment is a flat plate instead of a cube, and is lighter than a cube, so that the entire device can be lighter. Other structures and operation of this embodiment are the same as those of embodiment 1.
Example 3
As shown in fig. 10, the present embodiment is different from embodiment 2 in that a polarizing beam splitter 102 is selected. The polarization beam splitter 102 is a narrow band (440-470nm) polarization beam splitter, and for blue light (with a central wavelength of 460nm), the polarization beam splitter 102 can reflect the S-polarized light and transmit the P-polarized light, and for visible light with a wavelength longer than 470nm (such as yellow light), the polarization beam splitter 102 can reflect the light. When the laser light source 101 is placed, the polarization direction of the light emitted by the laser light source is P-polarized light with respect to the incident plane of the polarization beam splitter 102, and the polarization beam splitter 102 transmits the incident P-polarized light to the first optical path.
In the first path, the polarization splitter 102 transmits P-polarized blue light (with a center wavelength of 460nm) to a waveplate 103, here a quarter waveplate, which changes its polarization state for blue light (with a center wavelength of 460 nm). When the P-polarized blue light is incident to the wave plate 103, an included angle between the polarization plane of the P-polarized blue light and the fast axis or the slow axis of the wave plate 103 is 45 °, so that the polarization state of the P-polarized blue light is changed after the P-polarized blue light passes through the wave plate 103, and the P-polarized blue light is changed into circularly polarized blue light. These circularly polarized blue light transmitted through the wave plate 103 reaches the condensing element 104. The light-collecting element 104 is a collimating lens group, which can collect the circularly polarized blue light to the wavelength conversion device 105. The wavelength conversion device 105 is reflective and includes a reflective substrate and a wavelength converting material (e.g., a yellow phosphor patch) disposed on the reflective substrate. The specific structure of the wavelength conversion device 105 is the same as that of embodiment 1, and is not described herein again. Part of the circularly polarized blue light is absorbed by the wavelength conversion material on the wavelength conversion device 105 and converted into yellow light, the circularly polarized blue light and the yellow light which are not absorbed by the wavelength conversion material are emitted back to the first light path from the wavelength conversion device 105, the light rays are collimated by the light condensing element 104 and emitted to the wave plate 103, after the circularly polarized blue light emitted back to the first light path passes through the wave plate 103, the polarization state of the circularly polarized blue light is changed into S polarized light from original circularly polarized light, and finally, the mixed light emitted from the wave plate 103 contains the yellow light and the S polarized blue light, and the light rays are emitted to the polarization beam splitter 102. Since the polarization beam splitter 102 is a narrow-band polarization beam splitter, for blue light (with a central wavelength of 460nm), the polarization beam splitter 102 can reflect S-polarized light and transmit P-polarized light, and for yellow light, the polarization beam splitter 102 can reflect the yellow light, so that both yellow light and S-polarized blue light in the mixed light can be reflected by the polarization beam splitter 102, and the mixed light of yellow light and blue light is white light. The white light is emitted to the light-gathering component 106, wherein the light-gathering component 106 is a focusing lens, and finally the light is converged by the light-gathering component 106 and then emitted from the laser light-emitting device disclosed in the embodiment.
Example 4
As shown in fig. 11, the present embodiment is different from embodiment 2 in that: a light uniformizing device 107 is provided between the laser light source 101 and the polarization beam splitter 102. The light homogenizing device 107 is a diffuser, which is used to homogenize the light emitted from the laser source 101 and homogenize the laser spot converged on the wavelength conversion device 105, so that the wavelength conversion material is not easily burnt out by the laser light and the efficiency of the wavelength conversion material can be improved.
Example 5
As shown in fig. 12, the present embodiment is different from embodiment 2 in that: a light guide column 108 is disposed between the light-focusing element 104 and the wavelength conversion device 105, and is used to homogenize the light emitted from the polarization beam splitter 102 to the wavelength conversion device 105, so as to homogenize the laser spot converged on the wavelength conversion device 105, thereby making the wavelength conversion material less prone to be burned out by the laser light and improving the efficiency of the wavelength conversion material.

Claims (10)

1. A laser light-emitting device is characterized by comprising a laser light source, a polarization beam splitter, a wave plate, a light condensing element, a wavelength conversion device and a light condensing part, wherein a light path between the polarization beam splitter and the wavelength conversion device is defined as a first light path, wherein:
the polarization beam splitter makes the wavelength at lambda1～λ2Reflecting the light with S-polarized light relative to its incident surface to make the wavelength at lambda1～λ2A light ray having P-polarized light with respect to its incident surface is transmitted to make the wavelength longer than lambda2The visible light rays of (1) are transmitted or reflected;
when the polarization beam splitter makes the wavelength longer than lambda2When visible light rays are transmitted:
the laser source emits a first color light beam including S-polarized light relative to the incident plane of the polarization beam splitter, and the central wavelength of the first color light beam is lambda1～λ2The first color light emitted by the laser light source is emitted to the polarization beam splitter;
the polarization beam splitter will be S-polarized light with respect to its incident surface and have a wavelength at λ1～λ2The first color light is reflected into the first light path;
the light condensing element is positioned on the first light path, and is used for condensing the first color light reflected into the first light path from the polarization beam splitter to the wavelength conversion device, and meanwhile, is used for collimating the light reflected into the first light path from the wavelength conversion device and then emitting the light to the polarization beam splitter along the first light path;
the wavelength conversion device absorbs a part of the first color light reflected into the first light path from the polarization splitter, and then the first color light is excited to generate second color light, the central wavelength of the second color light is longer than that of the first color light, and the second color light and the first color light which is not absorbed by the wavelength conversion device emit to the polarization splitter from the wavelength conversion device along the first light path;
the wavelength conversion device is static or dynamic, when the wavelength conversion device is a dynamic device, the wavelength conversion device is a rotatable fluorescent wheel and only a fluorescent body area capable of reflecting light is arranged on the fluorescent wheel, all the fluorescent body areas are excited to generate second color light, and all the fluorescent body areas reflect the first color light which is not absorbed by the wavelength conversion device;
the wave plate is positioned on the first optical path and used for enabling the polarization direction of the first color light which is obtained by the wavelength conversion device and reaches the polarization beam splitter along the first optical path and is not absorbed by the wavelength conversion device to be different from the polarization direction of the first color light reflected into the first optical path from the polarization beam splitter;
the light which reaches the polarization beam splitter along the first light path from the wavelength conversion device is transmitted by the polarization beam splitter and then emitted to the light-gathering part, and the light is converged by the light-gathering part and then emitted from the laser light-emitting device;
when the polarization beam splitter makes the wavelength longer than lambda2When visible light rays are reflected:
the laser source emits a first color light beam containing P polarized light relative to the incident plane of the polarization beam splitter, and the central wavelength of the first color light beam is lambda1～λ2The first color light emitted by the laser light source is emitted to the polarization beam splitter;
the polarization beam splitter will be P-polarized with respect to its incident plane and have a wavelength at λ1～λ2The first color light rays in between are transmitted into a first light path;
the light condensing element is positioned on the first light path and is used for condensing the first color light transmitted into the first light path from the polarization beam splitter to the wavelength conversion device and collimating the light reflected into the first light path from the wavelength conversion device and then transmitting the light to the polarization beam splitter along the first light path;
the wavelength conversion device absorbs a part of the first color light transmitted into the first light path from the polarization splitter, and then the first color light is excited to generate second color light, the central wavelength of the second color light is longer than that of the first color light, and the second color light and the first color light which is not absorbed by the wavelength conversion device emit to the polarization splitter from the wavelength conversion device along the first light path;
the wavelength conversion device is static or dynamic, when the wavelength conversion device is a dynamic device, the wavelength conversion device is a rotatable fluorescent wheel and only a fluorescent body area capable of reflecting light is arranged on the fluorescent wheel, all the fluorescent body areas are excited to generate second color light, and all the fluorescent body areas reflect the first color light which is not absorbed by the wavelength conversion device;
the wave plate is positioned on the first optical path and used for enabling the polarization direction of the first color light which is obtained by the wavelength conversion device and reaches the polarization beam splitter along the first optical path and is not absorbed by the wavelength conversion device to be different from the polarization direction of the first color light which is transmitted into the first optical path from the polarization beam splitter;
the light from the wavelength conversion device to the polarization beam splitter along the first light path is reflected by the polarization beam splitter and then emitted to the light-gathering part, and the light is converged by the light-gathering part and then emitted from the laser light-emitting device.
2. The laser light emitting device of claim 1, wherein the laser light source comprises a laser and a collimating element:
the light emitted by the laser is linearly polarized light;
the collimation element is integrated in the laser or arranged outside the laser and is used for collimating light.
3. The laser illuminator of claim 2, further comprising a lens assembly for reducing a beam size of the laser beam, wherein all light generated by the laser is incident on the lens assembly, and wherein the first color light transmitted from the lens assembly is the first color light emitted by the laser source.
4. The laser emitting apparatus of claim 1, wherein the light condensing element is formed of at least one optical element having a collimating property.
5. The laser light-emitting apparatus according to claim 1, wherein the light-condensing element is constituted by at least one first lens.
6. The laser lighting device according to claim 1, wherein a light uniformizing device is disposed between the laser light source and the polarization beam splitter for uniformizing the first color light emitted from the laser light source.
7. The laser lighting device according to claim 6, wherein a second lens is disposed between the laser source and the light unifying device or between the light unifying device and the polarization beam splitter, for converging the first color light emitted from the laser source to the polarization beam splitter.
8. The laser lighting device according to claim 1, wherein a light guide is disposed between the light-collecting element and the wavelength conversion device for homogenizing the first color light emitted from the polarization splitter to the wavelength conversion device.
9. The laser illuminator of claim 8, wherein the light guide is a solid light guide or a hollow light guide.
10. The laser emitting apparatus of claim 1, further comprising a heat sink for dissipating heat from the laser light source and/or the wavelength conversion device.
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CN111578165A (en) * 2020-04-29 2020-08-25 赫尔曼·友瀚·范·贝赫库姆 Laser light-emitting device
CN113357574A (en) * 2021-06-30 2021-09-07 生迪智慧科技有限公司 Starry sky projecting lamp

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WO2014196015A1 (en) * 2013-06-04 2014-12-11 Ｎｅｃディスプレイソリューションズ株式会社 Illumination optical system and projector
WO2016157365A1 (en) * 2015-03-30 2016-10-06 Ｎｅｃディスプレイソリューションズ株式会社 Projector and image light projection method
CN106764470A (en) * 2015-11-19 2017-05-31 深圳市绎立锐光科技开发有限公司 A kind of light-source system and lighting device
CN205880480U (en) * 2016-04-06 2017-01-11 上海蓝湖照明科技有限公司 Illuminator and relevant projecting system and lighting system
CN107272312A (en) * 2016-04-06 2017-10-20 上海蓝湖照明科技有限公司 Light-emitting device and relevant projecting system and illuminator
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CN111578165A (en) * 2020-04-29 2020-08-25 赫尔曼·友瀚·范·贝赫库姆 Laser light-emitting device
CN113357574A (en) * 2021-06-30 2021-09-07 生迪智慧科技有限公司 Starry sky projecting lamp
CN113357574B (en) * 2021-06-30 2023-06-27 生迪智慧科技有限公司 Star projecting lamp

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