CN114296166B - Reflection rotating wheel device and application thereof in laser speckle elimination - Google Patents
Reflection rotating wheel device and application thereof in laser speckle elimination Download PDFInfo
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Abstract
The invention discloses a reflection rotating wheel device and application thereof in laser speckle elimination, and belongs to the technical field of laser display. The reflection runner device comprises a high-heat-conductivity high-reflection layer and a driving device, wherein the high-heat-conductivity high-reflection layer is arranged on the upper surface of the driving device, the driving device drives the high-heat-conductivity high-reflection layer to rotate, the diffuse reflection strength of the high-heat-conductivity high-reflection layer is more than or equal to 65%, and the heat conductivity is more than or equal to 30W m ‑ 1K‑1. The reflection rotating wheel device is simple, convenient and practical, comprises the high-heat-conductivity high-reflection layer and the driving device, and the high-heat-conductivity high-reflection layer can realize high-strength diffuse reflection and high-efficiency heat dissipation, so that the speckle effect of laser display is effectively weakened, and the reflection rotating wheel device can be widely applied to laser display devices for weakening the laser speckle phenomenon.
Description
Technical Field
The invention relates to the technical field of laser display, in particular to a reflection rotating wheel device and application thereof in laser speckle elimination.
Background
The laser has the advantages of good directivity, good monochromaticity, high brightness, linear spectrum and the like, and is very suitable for being applied to the display field. Compared with other display technologies, the laser projection display has the advantages of wide color gamut display, high color saturation, high color resolution, energy conservation, environmental protection and the like, and is considered as a next-generation mainstream display technology. However, due to the high coherence of the laser, when the laser irradiates the surface of a rough object, speckle phenomenon is formed by interference superposition on the object surface. The presence of speckle severely affects the imaging quality of laser displays, degrades the contrast and resolution of images, and has become one of the main reasons that restricts and hinders the marketization of laser displays. Therefore, in the field of laser display, elimination of laser speckle is a very important task. The existing reflection rotating wheel device cannot solve the laser speckle effect existing in laser display and cannot meet the requirement of high-power laser display.
In order to eliminate laser speckles, the prior art discloses a laser projection device, which comprises a laser light source, a driving modulation power supply, a reflection rotating wheel and a rotation driving device, wherein the rotation driving device drives a rotating shaft of the reflection rotating wheel to rotate; the outer peripheral surface of the reflection wheel is provided with a reflection surface composed of various patterns. The laser projection device mainly aims at improving the problems of low brightness and large chromatic aberration of laser projection by arranging reflection surfaces formed by various patterns on the periphery of a laser reflection rotating wheel and adjusting a laser light source, and does not relate to weakening of speckle effect existing in related laser display.
Disclosure of Invention
The invention aims to overcome the defects and differences of laser speckles in the existing laser display and provides a reflection rotating wheel device which can effectively weaken the laser speckles.
It is another object of the present invention to provide a reflective wheel apparatus for laser speckle reduction.
The above object of the present invention is achieved by the following technical scheme:
A reflection rotating wheel device is characterized by comprising a high heat conduction and high reflection layer and a driving device, wherein the high heat conduction and high reflection layer is arranged on the upper surface of the driving device and driven by the driving device to rotate,
The diffuse reflection strength of the high-heat-conductivity high-reflection layer is more than or equal to 65%, and the heat conductivity is more than or equal to 30W m -1K-1.
The high-heat-conductivity high-reflection layer has high reflectivity at 400-700 nm and heat conductivity of about 30W m-1K-1, and meets the requirement of high-power laser display.
The action mechanism of the reflection rotating wheel device for weakening laser speckles is as follows:
When the laser beam irradiates the reflection rotating wheel device, on one hand, due to the high diffuse reflection intensity of the high heat conduction and high reflection layer, a static random phase structure exists on the surface of the reflection rotating wheel, and laser light generates lambertian reflection on the surface of the reflection rotating wheel to generate a plurality of reflection light rays with different angles, so that the coherence of the laser light is reduced; on the other hand, the high-speed rotation also introduces a dynamic random phase structure, and the coherence of laser is further reduced. The finally obtained light source has chaotic phase and low coherence, thereby effectively weakening the speckle effect of laser display.
Preferably, the diffuse reflection intensity of the high heat conduction high reflection layer is 80-92%. The higher the diffuse reflection intensity is, the better the corresponding laser speckle eliminating effect is.
Preferably, the thickness of the high heat conduction and high reflection layer is 10-40 μm.
Further preferably, the thickness of the high thermal conductivity and high reflection layer is 20 to 30 μm.
When the thickness of the reflecting material is 20-30 microns, the high-heat-conductivity high-reflection layer can ensure higher reflectivity and higher heat conductivity.
Preferably, the high-heat-conductivity high-reflection layer comprises a high-reflection layer and a high-heat-conductivity substrate layer from top to bottom, the high-reflection layer and the high-heat-conductivity substrate layer are formed by sintering and bonding, and glass powder is used as a bonding agent in the sintering process.
The following description is needed:
The high-heat-conductivity substrate layer can be a transparent sapphire sheet, and the high-reflection layer can be a slurry layer formed by dispersing TiO 2 or BaSO 4.
Specific preparation steps of the high thermal conductivity and high reflection layer can be referred to as follows:
S1, placing a high-reflection material, glass powder and an organic dispersing agent in a mortar, and fully grinding and mixing to prepare slurry;
S2, uniformly printing the slurry on a transparent sapphire sheet through a silk screen; sintering in a muffle furnace at a high temperature; cooling and taking out to obtain a composite material;
S3, repeating the step S2 to obtain the high-heat-conductivity high-reflection layers with different reflection material thicknesses.
Preferably, the glass powder is one or more of silicate glass, borosilicate glass, phosphate glass and tellurate glass.
Further preferably, the glass frit is silicate glass and/or borosilicate glass.
When the glass powder is silicate glass and borosilicate glass, the reflectivity of the high-heat-conductivity high-reflection layer is highest, and the high-heat-conductivity high-reflection material and the high-heat-conductivity substrate are more firmly compounded.
In still another embodiment, the driving device may be a micro dc motor.
The high-heat-conductivity high-reflection layer is arranged on the upper surface of the driving device, and in a specific embodiment, the high-heat-conductivity high-reflection layer can be arranged on the upper surface of the driving device through industrial glue, and the adopted industrial glue can be one or more of instant adhesive, epoxy adhesive, ultraviolet curing adhesive and the like.
The reflection rotating wheel device has the characteristics of high heat conduction and high reflection, reduces the coherence of laser, thereby effectively weakening the speckle effect of laser display, has good laser speckle elimination effect and heat dissipation, can be widely applied to laser speckle elimination, and also specifically protects the application of the reflection rotating wheel device in the laser speckle elimination.
Compared with the prior art, the invention has the beneficial effects that:
The reflection rotating wheel device is simple, convenient and practical, comprises the high-heat-conductivity high-reflection layer and the driving device, wherein the high-heat-conductivity high-reflection layer can realize high-strength diffuse reflection and high-efficiency heat dissipation, the surface of the reflection rotating wheel is of a static random phase structure, laser generates lambertian reflection on the surface of the reflection rotating wheel to generate a plurality of reflection light rays with different angles, and the coherence of the laser is reduced; on the other hand, the driving device drives the reflection rotating wheel device to rotate at a high speed, and a dynamic random phase structure is introduced, so that the coherence of laser is further reduced, and finally the obtained light source has disordered phase and low coherence, so that the speckle effect of laser display is effectively weakened, and the method can be widely applied to the laser display device for weakening the laser speckle phenomenon.
Drawings
FIG. 1 is a schematic diagram of a reflective wheel apparatus for reducing laser speckle
Fig. 2 is a laser speckle pattern obtained by a general mirror.
FIG. 3 is a graph of laser speckle without rotation using the laser speckle reduction reflective wheel apparatus of example 1.
FIG. 4 is a graph of laser speckle at rotation using the laser speckle reduction reflective wheel apparatus of example 1.
Detailed Description
The invention will be further described with reference to the following specific embodiments, but the examples are not intended to limit the invention in any way. Raw materials reagents used in the examples of the present invention are conventionally purchased raw materials reagents unless otherwise specified.
Example 1
A reflection runner device for weakening laser speckle is shown in figure 1, which comprises a high heat conduction high reflection layer 1 and a driving device 2, wherein the high heat conduction high reflection layer 1 is arranged on the upper surface of the driving device 2, the driving device 2 drives the high heat conduction high reflection layer 1 to rotate,
The high-heat-conductivity high-reflection layer 1 comprises a high-reflection layer 101 and a high-heat-conductivity substrate layer 102 from top to bottom, wherein the high-reflection layer 101 and the high-heat-conductivity substrate layer 102 are formed by sintering and bonding, and glass powder is used as an adhesive in the sintering process.
The driving device 2 is a miniature direct current motor, and the high heat conduction and high reflection layer 1 is combined with the miniature direct current motor by using industrial glue.
The preparation method comprises the following steps:
S1, placing a high-reflection material, silicate glass powder and an organic dispersing agent in a mortar, and fully grinding and mixing to prepare slurry;
S2, uniformly printing the slurry on a transparent sapphire sheet through a silk screen; sintering in a muffle furnace at a high temperature; cooling and taking out to obtain a composite material;
s3, repeating the step S2 for three times to obtain the high-heat-conductivity high-reflection layer with the thickness of the reflection material of about 30 mu m;
s4, bonding the high-heat-conductivity high-reflection layer with the miniature direct-current motor by using industrial glue epoxy glue, and obtaining the reflection rotating wheel device.
Example 2
A reflection runner device for weakening laser speckle comprises a high heat conduction high reflection layer 1 and a driving device 2, wherein the high heat conduction high reflection layer 1 is arranged on the upper surface of the driving device 2, the driving device 2 drives the high heat conduction high reflection layer 1 to rotate,
The high-heat-conductivity high-reflection layer 1 comprises a high-reflection layer 101 and a high-heat-conductivity substrate layer 102 from top to bottom, wherein the high-reflection layer 101 and the high-heat-conductivity substrate layer 102 are formed by sintering and bonding, and glass powder is used as an adhesive in the sintering process.
The driving device 2 is a miniature direct current motor, and the high heat conduction and high reflection layer 1 is combined with the miniature direct current motor by using industrial glue.
The preparation method comprises the following steps:
s1, placing a high-reflection material, borosilicate glass and an organic dispersing agent in a mortar, and fully grinding and mixing to prepare slurry;
S2, uniformly printing the slurry on a transparent sapphire sheet through a silk screen; sintering in a muffle furnace at a high temperature; cooling and taking out to obtain a composite material;
s3, repeating the step S2 for three times to obtain the high-heat-conductivity high-reflection layer with the thickness of the reflection material of about 30 mu m;
s4, bonding the high-heat-conductivity high-reflection layer with the miniature direct-current motor by using industrial glue epoxy glue, and obtaining the reflection rotating wheel device.
Example 3
A reflection runner device for weakening laser speckle comprises a high heat conduction high reflection layer 1 and a driving device 2, wherein the high heat conduction high reflection layer 1 is arranged on the upper surface of the driving device 2, the driving device 2 drives the high heat conduction high reflection layer 1 to rotate,
The high-heat-conductivity high-reflection layer 1 comprises a high-reflection layer 101 and a high-heat-conductivity substrate layer 102 from top to bottom, wherein the high-reflection layer 101 and the high-heat-conductivity substrate layer 102 are formed by sintering and bonding, and glass powder is used as an adhesive in the sintering process.
The driving device 2 is a miniature direct current motor, and the high heat conduction and high reflection layer 1 is combined with the miniature direct current motor by using industrial glue.
The preparation method comprises the following steps:
S1, placing a high-reflection material, phosphate glass and an organic dispersing agent in a mortar, and fully grinding and mixing to prepare slurry;
S2, uniformly printing the slurry on a transparent sapphire sheet through a silk screen; sintering in a muffle furnace at a high temperature; cooling and taking out to obtain a composite material;
s3, repeating the step S2 for three times to obtain the high-heat-conductivity high-reflection layer with the thickness of the reflection material of about 30 mu m;
s4, bonding the high-heat-conductivity high-reflection layer with the miniature direct-current motor by using industrial glue epoxy glue, and obtaining the reflection rotating wheel device.
Example 4
A reflection runner device for weakening laser speckle comprises a high heat conduction high reflection layer 1 and a driving device 2, wherein the high heat conduction high reflection layer 1 is arranged on the upper surface of the driving device 2, the driving device 2 drives the high heat conduction high reflection layer 1 to rotate,
The high-heat-conductivity high-reflection layer 1 comprises a high-reflection layer 101 and a high-heat-conductivity substrate layer 102 from top to bottom, wherein the high-reflection layer 101 and the high-heat-conductivity substrate layer 102 are formed by sintering and bonding, and glass powder is used as an adhesive in the sintering process.
The driving device 2 is a miniature direct current motor, and the high heat conduction and high reflection layer 1 is combined with the miniature direct current motor by using industrial glue.
The preparation method comprises the following steps:
s1, placing a high-reflection material, tellurate glass and an organic dispersing agent in a mortar, and fully grinding and mixing to prepare slurry;
S2, uniformly printing the slurry on a transparent sapphire sheet through a silk screen; sintering in a muffle furnace at a high temperature; cooling and taking out to obtain a composite material;
s3, repeating the step S2 for three times to obtain the high-heat-conductivity high-reflection layer with the thickness of the reflection material of about 30 mu m;
s4, bonding the high-heat-conductivity high-reflection layer with the miniature direct-current motor by using industrial glue epoxy glue, and obtaining the reflection rotating wheel device.
Example 5
A reflection runner device for weakening laser speckle is shown in figure 1, which comprises a high heat conduction high reflection layer 1 and a driving device 2, wherein the high heat conduction high reflection layer 1 is arranged on the upper surface of the driving device 2, the driving device 2 drives the high heat conduction high reflection layer 1 to rotate,
The high-heat-conductivity high-reflection layer 1 comprises a high-reflection layer 101 and a high-heat-conductivity substrate layer 102 from top to bottom, wherein the high-reflection layer 101 and the high-heat-conductivity substrate layer 102 are formed by sintering and bonding, and glass powder is used as an adhesive in the sintering process.
The driving device 2 is a miniature direct current motor, and the high heat conduction and high reflection layer 1 is combined with the miniature direct current motor by using industrial glue.
The preparation method comprises the following steps:
S1, placing a high-reflection material, silicate glass powder and an organic dispersing agent in a mortar, and fully grinding and mixing to prepare slurry;
s2, uniformly printing the slurry on a transparent sapphire sheet through a silk screen; sintering in a muffle furnace at a high temperature; cooling and taking out to obtain a high-heat-conductivity high-reflection layer;
s3, repeating the step S2 for three times to obtain the high-heat-conductivity high-reflection layer with the thickness of the reflection material of about 10 mu m;
s4, bonding the high-heat-conductivity high-reflection layer with the miniature direct-current motor by using industrial glue epoxy glue, and obtaining the reflection rotating wheel device.
Example 6
A reflection runner device for weakening laser speckle is shown in figure 1, which comprises a high heat conduction high reflection layer 1 and a driving device 2, wherein the high heat conduction high reflection layer 1 is arranged on the upper surface of the driving device 2, the driving device 2 drives the high heat conduction high reflection layer 1 to rotate,
The high-heat-conductivity high-reflection layer 1 comprises a high-reflection layer 101 and a high-heat-conductivity substrate layer 102 from top to bottom, wherein the high-reflection layer 101 and the high-heat-conductivity substrate layer 102 are formed by sintering and bonding, and glass powder is used as an adhesive in the sintering process.
The driving device 2 is a miniature direct current motor, and the high heat conduction and high reflection layer 1 is combined with the miniature direct current motor by using industrial glue.
The preparation method comprises the following steps:
S1, placing a high-reflection material, silicate glass powder and an organic dispersing agent in a mortar, and fully grinding and mixing to prepare slurry;
S2, uniformly printing the slurry on a transparent sapphire sheet through a silk screen; sintering in a muffle furnace at a high temperature; cooling and taking out to obtain a composite material;
S3, repeating the step S2 for three times to obtain the high-heat-conductivity high-reflection layer with the thickness of the reflection material being about 20 mu m;
s4, bonding the high-heat-conductivity high-reflection layer with the miniature direct-current motor by using industrial glue epoxy glue, and obtaining the reflection rotating wheel device.
Example 7
A reflection runner device for weakening laser speckle is shown in figure 1, which comprises a high heat conduction high reflection layer 1 and a driving device 2, wherein the high heat conduction high reflection layer 1 is arranged on the upper surface of the driving device 2, the driving device 2 drives the high heat conduction high reflection layer 1 to rotate,
The high-heat-conductivity high-reflection layer 1 comprises a high-reflection layer 101 and a high-heat-conductivity substrate layer 102 from top to bottom, wherein the high-reflection layer 101 and the high-heat-conductivity substrate layer 102 are formed by sintering and bonding, and glass powder is used as an adhesive in the sintering process.
The driving device 2 is a miniature direct current motor, and the high heat conduction and high reflection layer 1 is combined with the miniature direct current motor by using industrial glue.
The preparation method comprises the following steps:
S1, placing a high-reflection material, silicate glass powder and an organic dispersing agent in a mortar, and fully grinding and mixing to prepare slurry;
S2, uniformly printing the slurry on a transparent sapphire sheet through a silk screen; sintering in a muffle furnace at a high temperature; cooling and taking out to obtain a composite material;
S3, repeating the step S2 for three times to obtain the high-heat-conductivity high-reflection layer with the thickness of the reflection material of about 25 mu m;
s4, bonding the high-heat-conductivity high-reflection layer with the miniature direct-current motor by using industrial glue epoxy glue, and obtaining the reflection rotating wheel device.
Example 8
A reflection runner device for weakening laser speckle is shown in figure 1, which comprises a high heat conduction high reflection layer 1 and a driving device 2, wherein the high heat conduction high reflection layer 1 is arranged on the upper surface of the driving device 2, the driving device 2 drives the high heat conduction high reflection layer 1 to rotate,
The high-heat-conductivity high-reflection layer 1 comprises a high-reflection layer 101 and a high-heat-conductivity substrate layer 102 from top to bottom, wherein the high-reflection layer 101 and the high-heat-conductivity substrate layer 102 are formed by sintering and bonding, and glass powder is used as an adhesive in the sintering process.
The driving device 2 is a miniature direct current motor, and the high heat conduction and high reflection layer 1 is combined with the miniature direct current motor by using industrial glue.
The preparation method comprises the following steps:
S1, placing a high-reflection material, silicate glass powder and an organic dispersing agent in a mortar, and fully grinding and mixing to prepare slurry;
S2, uniformly printing the slurry on a transparent sapphire sheet through a silk screen; sintering in a muffle furnace at a high temperature; cooling and taking out to obtain a composite material;
s3, repeating the step S2 for three times to obtain the high-heat-conductivity high-reflection layer with the thickness of the reflection material being about 40 mu m;
s4, bonding the high-heat-conductivity high-reflection layer with the miniature direct-current motor by using industrial glue epoxy glue, and obtaining the reflection rotating wheel device.
Result detection
(1) Diffuse reflectance spectrum test
The test was done using a Cary-5000 uv-vis-nir spectrophotometer. The test range is 400-700nm.
Firstly, testing diffuse reflection of a reference sample (the total reflection barium sulfate powder is selected in the test) in a corresponding wave band, and then testing diffuse reflection of the sample in the corresponding wave band to finally obtain a diffuse reflection spectrum. And selecting the diffuse reflection intensity at 450nm as a standard for comparison.
The results are shown in Table 1
TABLE 1 Diffuse reflection Strength at 450nm for the examples
| Diffuse reflection intensity (%) | Diffuse reflection intensity (%) | ||
| Example 1 | 91.5 | Example 5 | 65.3 |
| Example 2 | 90.5 | Example 6 | 90.1 |
| Example 3 | 82.0 | Example 7 | 89.4 |
| Example 4 | 78.9 | Example 8 | 85.3 |
From the data in table 1, it can be seen that the high heat conduction and high reflection layers of the reflection runner device have higher diffuse reflection intensity, which can reach 91.5% at most, and the higher diffuse reflection intensity of the high heat conduction and high reflection layers is more beneficial to obtaining laser light sources with disordered phases and lower coherence during laser beam irradiation, so that the speckle effect of laser display is reduced.
It can be seen from examples 1 to 4 that the kind of glass frit has a great influence on the diffuse reflection intensity of the sample. When the glass powder is silicate glass or borosilicate glass, the diffuse reflection strength of the sample is better.
It can be seen from examples 5 to 8 that the thickness of the reflective material has a great influence on the diffuse reflection intensity of the sample. When the thickness of the reflecting material is 20-30 microns, the diffuse reflection intensity of the sample is better.
(2) Laser speckle testing
And testing the laser speckle pattern by a laser speckle tester SM01VS09 SERIES to obtain speckle contrast.
Fig. 2 is a laser speckle pattern of a conventional reflective wheel device (without a highly thermally conductive and reflective layer). It can be seen that the speckle phenomenon is very severe, and the speckle contrast obtained by the test is 9%.
FIG. 3 is a graph of laser speckle without rotation using the laser speckle reduction reflective wheel apparatus of example 1. It can be seen that the speckle phenomenon is greatly improved compared to fig. 2, and the speckle contrast obtained by the test is 2.4%.
FIG. 4 is a graph of laser speckle at rotation using the laser speckle reduction reflective wheel apparatus of example 1. It can be seen that the speckle phenomenon is further suppressed compared to fig. 3, and that the speckle contrast obtained by the test is 2.2%.
It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (5)
1. The application of the reflection runner device in laser speckle elimination is characterized in that the reflection runner device comprises a high heat conduction and high reflection layer (1) and a driving device (2), the high heat conduction and high reflection layer (1) is arranged on the upper surface of the driving device (2), the driving device (2) drives the high heat conduction and high reflection layer (1) to rotate,
The diffuse reflection intensity of the high-heat-conductivity high-reflection layer at 450nm is 80-92%, and the heat conductivity is more than or equal to 30W m -1 K-1;
The high-heat-conductivity high-reflection layer (1) comprises a high-reflection layer (101) and a high-heat-conductivity substrate layer (102) from top to bottom, wherein the high-reflection layer (101) and the high-heat-conductivity substrate layer (102) are formed by sintering and bonding, and glass powder is used as an adhesive in the sintering process;
The thickness of the high-reflection layer in the high-heat-conductivity high-reflection layer (1) is 20-30 mu m;
the high-heat-conductivity high-reflection material of the high-heat-conductivity high-reflection layer (1) is TiO 2 or BaSO 4;
the glass powder is one or more of silicate glass, borosilicate glass or phosphate glass.
2. Use according to claim 1, wherein the highly thermally conductive and highly reflective layer (1) comprises a highly reflective layer (101) and a highly thermally conductive substrate layer (102) from top to bottom, the highly reflective layer (101) and the highly thermally conductive substrate layer (102) being formed by sintering and bonding, with glass frit as the binder during sintering.
3. The use according to claim 2, wherein the glass frit is silicate glass and/or borosilicate glass.
4. Use according to claim 1, wherein the driving means (2) is a miniature dc motor.
5. The use according to claim 1, characterized in that the high thermal conductivity and high reflection layer (1) is arranged on the upper surface of the drive means (2) by means of an industrial glue connection.
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| CN205720746U (en) * | 2016-04-22 | 2016-11-23 | 深圳市绎立锐光科技开发有限公司 | A kind of reflection unit and relevant wavelength conversion equipment, colour wheel and light-source system |
| CN109654391A (en) * | 2017-10-10 | 2019-04-19 | 深圳光峰科技股份有限公司 | Wavelength converter |
| CN110261942A (en) * | 2018-03-12 | 2019-09-20 | 深圳光峰科技股份有限公司 | Wavelength converter and preparation method thereof |
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| CN104566229B (en) * | 2013-10-15 | 2016-06-08 | 深圳市光峰光电技术有限公司 | Manufacturing method of wavelength conversion device |
| CN112083521A (en) * | 2019-06-13 | 2020-12-15 | 深圳市绎立锐光科技开发有限公司 | Preparation method of diffuse reflection device and diffuse reflection device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN205720746U (en) * | 2016-04-22 | 2016-11-23 | 深圳市绎立锐光科技开发有限公司 | A kind of reflection unit and relevant wavelength conversion equipment, colour wheel and light-source system |
| CN109654391A (en) * | 2017-10-10 | 2019-04-19 | 深圳光峰科技股份有限公司 | Wavelength converter |
| CN110261942A (en) * | 2018-03-12 | 2019-09-20 | 深圳光峰科技股份有限公司 | Wavelength converter and preparation method thereof |
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