CN218602907U - Light source based on laser excitation fluorescent material - Google Patents
Light source based on laser excitation fluorescent material Download PDFInfo
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- CN218602907U CN218602907U CN202222805518.5U CN202222805518U CN218602907U CN 218602907 U CN218602907 U CN 218602907U CN 202222805518 U CN202222805518 U CN 202222805518U CN 218602907 U CN218602907 U CN 218602907U
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Abstract
The utility model relates to a light source of laser excitation fluorescent material. A light source based on a laser excited fluorescent material is characterized by comprising a laser diode, a laser beam shaping assembly and a fluorescent film which are sequentially arranged, wherein a monochromatic laser beam emitted from the laser diode enters an optical diffusion sheet after being shaped by a rod mirror, the beam reaches a required shape and size and irradiates one surface of the fluorescent film, and fluorescence generated by the laser excited fluorescent material and laser not absorbed by a fluorescence conversion sheet are output at the other side of the fluorescent film. The utility model discloses have efficient, simple structure, beneficial effect that the cost of manufacture is low.
Description
Technical Field
The utility model relates to a light source based on laser arouses fluorescent material for technical field such as illumination and demonstration.
Background
The light source based on the high-power laser diode for exciting the fluorescent material emits fluorescence by depending on the monochromatic excitation fluorescence wavelength conversion sheet emitted from the laser diode, has the advantages of high efficiency, low cost, long service life, small volume and the like, and is widely applied to various fields such as automobile illumination, laser projection, machine vision, stage illumination, search illumination, biomedical treatment and the like. As is well known, the initial light beam emitted from a laser diode has an elliptical light emitting surface and a large difference in divergence angle between the fast axis and the slow axis, and therefore needs to be shaped to control the size and shape of the spot irradiated on the fluorescence wavelength conversion sheet. The following methods are generally used for beam shaping: (1) The double-lens method is that one lens is used for collimating the incident laser, and then one lens is used for focusing the collimated incident laser. The method needs two lenses, which brings the problems of high lens cost, loss of light beams after passing through a plurality of lenses and the like; (2) focusing the incident laser beam with a single lens. The method has the defects of long focal length, low efficiency, poor shaping effect and the like although the structure is simple and the cost is low. Therefore, a light beam shaping method with simple structure, low cost and controllable light shape is needed to shape the laser beam emitted by the laser diode, and on the basis, the light source with high efficiency, simple structure and low manufacturing cost is formed by matching with the fluorescent diaphragm.
SUMMERY OF THE UTILITY MODEL
The utility model provides a light source based on laser arouses fluorescent material to the problem that prior art exists.
The utility model discloses a can realize through following technical scheme:
the utility model relates to a laser excitation fluorescent material's light source, a serial communication port, including laser diode, rod mirror, optical diffusion piece and the fluorescence diaphragm that sets gradually. The monochromatic laser beam emitted from the laser diode enters the optical diffusion sheet after being shaped by the rod mirror, the beam reaches the required shape and size and irradiates one surface of the fluorescent film, and the laser excites the fluorescence generated by the fluorescent material and the laser which is not absorbed by the fluorescent film is output at the other side of the fluorescent film.
Furthermore, the rod mirror is arranged on a light-emitting window of the laser diode for shaping the laser beam, the rod mirror is arranged in the middle of the light-emitting surface of the laser diode, the axial line of the rod mirror is parallel to the slow axis direction of the light-emitting surface of the laser diode, and the light emitted by the laser diode is focused on the other side of the rod mirror after passing through the rod mirror.
Further, the diameter of the rod mirror is selected according to specific requirements. The length of the rod mirror is not more than the diameter of the light-emitting window of the laser diode but more than the size of the light-emitting area of the laser diode, so as to ensure the optical efficiency of the shaping system.
Further, the surface of the rod mirror is plated with an optical antireflection film to improve the optical efficiency, the wavelength range of the antireflection film is equivalent to the wavelength of incident laser, and the rod mirror can be made of K9, UV fused quartz or sapphire.
Further, in order to enlarge the size of the shaped light beam and improve the uniformity of the light intensity distribution thereof, an optical diffusion sheet is placed between the rod mirror and the fluorescence wavelength conversion sheet. The diffusion sheet has a diffusion angle for incident light selected according to design requirements, and the diffusion angle can be between 0.5 and 10 degrees. The larger the diffusion angle is, the larger the diameter of the laser beam irradiated on the fluorescent film is, and the more uniform the light intensity is. The distance between the diffusion sheet and the fluorescent film is also determined according to requirements, and the longer the distance is, the larger the diameter of the laser beam irradiated on the fluorescent film is, and the more uniform the light intensity is.
Further, the laser beam shaped by the beam enters from one side of the fluorescent film sheet, and reacts with the fluorescent material to emit light of different wavelengths with longer wavelength and wider range, and then is output from the other side. The fluorescent film is formed by arranging a fluorescent material film on a transparent substrate, and the thickness of the fluorescent film is between 0.2mm and 1 mm.
Further, the laser diode is characterized in that the laser wavelength emitted by the laser diode is in a blue waveband (the wavelength is between 400nm and 470 nm), and the optical power is between 0.5W and 15W.
The utility model discloses have efficient, simple structure, beneficial effect that the cost of manufacture is low.
Drawings
Fig. 1 is a schematic diagram illustrating the divergence of a light beam from a light-emitting surface of a laser diode.
FIG. 2 is a diagram showing the relationship between the dimension of the light beam in the fast axis and slow axis direction and the distance from the light-emitting surface.
Fig. 3 is a schematic diagram of a laser beam after rod mirror shaping.
FIG. 4 is a diagram showing the relationship between the dimension of the beam in the fast axis and slow axis direction and the distance from the light-emitting surface after the beam is shaped by the rod mirror.
Fig. 5 is a schematic diagram of the structure of the laser light source.
FIG. 6 shows the shape and intensity distribution of the light-emitting surface of the light source after shaping the laser beam by using a rod mirror with a diameter of 1 mm.
FIG. 7 is the light intensity distribution of the light-emitting surface of the light source after the laser beam is shaped by the rod mirror with the diameter of 1 mm.
Detailed Description
As shown in fig. 1, for a typical laser diode, when the beam diverges outward from the laser diode, the beam appears elliptical and highly divergent in cross-section, diverging at different angles in the x (slow axis) and y (fast axis) directions. The divergence angle of the beam in the fast axis direction (y-z plane) is much larger than the divergence angle in the slow axis direction (x-z plane). In general, the beam intensity drops to 50% of the central intensity level of the beam, with typical values for the angle between 20 and 35 degrees in the fast axis direction and between 7 and 14 degrees in the slow axis direction. The relationship between the dimension a of the light beam in the fast axis direction and the dimension b of the light beam in the slow axis direction and the distance z can be schematically described with reference to fig. 2. As shown in fig. 2, the dimension a increases rapidly with increasing distance z, while the relative change in b is relatively small. Therefore, if we place a rod mirror in the slow axis direction on the light-emitting surface close to the laser diode, as shown in fig. 3, it mainly changes the divergence angle of the light beam in the fast axis direction while keeping the divergence angle in the slow axis direction constant, and the relationship between the dimension a in the fast axis direction and the dimension b in the slow axis direction and the distance z is shown in fig. 4. Thus, on the side of the rod mirror away from the light emitting surface of the laser tube, a location can be found where the beam dimensions in the fast and slow axis directions are approximately equal.
As shown in fig. 3, if the rod mirror diameter D, its distance D from the laser beam exit point, the refractive index of the material n, its effective focal length EFL,
the angle theta of the light beam in the fast axis direction received by the rod mirror is,
the light collection angle theta reflects the efficiency of the rod mirror, and the larger the theta is, the more light beams are converged by the rod mirror (302), so that the efficiency is higher. On the other hand, as can be seen from the formula (2), the larger the diameter D of the rod mirror, the longer the effective focal length EFL, and the larger the size of the entire shaping optical system.
The invention will be further illustrated below with specific examples.
Example 1: referring to fig. 3, the rod mirror is placed at the glass window of the laser diode, the axial direction of the rod mirror is parallel to the slow axis direction of the laser light of the light emitting surface of the laser diode, the diameters D of the rod mirror are 0.5mm,0.8mm,1.0mm,1.5mm and 2mm, and the maximum light receiving angles are 36.8 °,48 °,53.2 °,62 ° and 67.4 ° as shown in table 1. The larger the diameter of the rod mirror is, the larger the light receiving angle theta is.
TABLE 1 relationship between the light-collecting angle of the rod mirror and the diameter of the rod mirror
| Diameter of rod mirror D (mm) | 0.5 | 0.8 | 1 | 1.5 | 2 |
| Angle of collection theta (degree) | 36.8 | 48 | 53.2 | 62 | 67.4 |
Example 2: referring to fig. 3, rod mirrors having the same diameter of 1.0mm were placed at the glass windows of the laser diodes, and the light receiving angles were 53.2 ° and 39.4 °, respectively. The relationship between the light collection angle and the distance from the laser light emitting surface of the rod mirror is shown in table 2. The closer the placing position of the rod mirror is to the light emitting point of the laser diode within the allowed range of the focal length, the larger the light receiving angle theta is, and the light energy utilization rate is high.
TABLE 2 relationship between the collection angle and the distance of the rod mirror from the laser light emitting surface
| Distance d (mm) | 0.95 | 1 | 1.2 | 1.5 | 2 |
| Angle of collection theta (degree) | 34.6 | 33.7 | 30.5 | 26.6 | 21.8 |
Example 3: referring to fig. 5, the laser beam shaping is performed by using a rod mirror based on a light source for exciting fluorescence by laser, which sequentially includes a laser diode (501), a rod mirror (502) disposed at a glass window of the laser diode (501), a beam diffusion sheet (503), and a fluorescence lapping sheet (504). The laser beam comes out of the laser diode (501), after being shaped by the rod lens (502), enters the optical diffusion sheet (503), the beam thereof reaches the required shape and size, and then irradiates one side of the fluorescent film (504), and the fluorescence generated by the fluorescent material excited by the laser and the laser not absorbed by the fluorescent film (504) are output at the other side of the fluorescent film (504).
Example 4: a light source with a rod lens diameter of 1.0 mm. According to the structure of FIG. 5, a laser diode with a laser power of 3.5W and an emission wavelength of 450nm is selected, the divergence angle of the fast axis is 35-53 degrees, and the divergence angle of the slow axis is 4-16 degrees. A rod mirror with the diameter of 1.0mm and the length of 3.1mm is selected and placed at a glass window of a laser diode, and the maximum light receiving angle is 53.2 degrees. And selecting an optical diffusion sheet with a diffusion angle of 5 degrees and a thickness of 0.3mm and a fluorescent film with an emission dominant wavelength of 550nm and a thickness of 0.35mm to form a light source based on laser excitation fluorescence. The shape of the light-emitting surface is shown in fig. 6, the light intensity distribution on the light-emitting surface is shown in fig. 7, and various optical performance indexes are shown in table 3.
TABLE 3 optical performance index of light source with rod lens diameter of 1mm
| Measuring parameters | Numerical value | Unit of |
| Electric current | 2 | A |
| Voltage of | 4.1 | V |
| Luminous flux | 450 | lm |
| Color temperature | 4600 | K |
| Center brightness | 750 | cd/mm 2 |
Example 5 light source with a rod mirror diameter of 1.5 mm. According to the structure of FIG. 5, a laser diode with a laser power of 3.5W and an emission wavelength of 450nm is selected, the divergence angle of the fast axis is 35-53 degrees, and the divergence angle of the slow axis is 4-16 degrees. A rod mirror with the diameter of 1.5mm and the length of 3.1mm is selected and placed at a glass window of a laser diode, and the maximum light-receiving angle is 62 degrees. And selecting an optical diffusion sheet with a diffusion angle of 5 degrees and a thickness of 0.3mm and a fluorescence wavelength conversion sheet with an emission main wavelength of 550nm and a thickness of 0.35mm to form a laser-excited-based fluorescence light source. The optical performance indexes are shown in table 4.
TABLE 4 optical performance index of light source with rod lens diameter of 1mm
It will be understood by those skilled in the art that the embodiments of the present invention as described above and shown in the drawings are given by way of example only and are not limiting of the present invention. The purpose of the utility model is completely and effectively realized. The functional and structural principles of the present invention have been shown and described in the embodiments without departing from the principles, embodiments of the present invention may have any deformation or modification.
Claims (11)
1. A light source based on a laser excited fluorescent material is characterized by comprising a laser diode, a laser beam shaping assembly and a fluorescent film which are sequentially arranged, wherein a monochromatic laser beam emitted from the laser diode enters an optical diffusion sheet after being shaped by a rod mirror, the beam reaches a required shape and size and irradiates one surface of the fluorescent film, and fluorescence generated by the laser excited fluorescent material and laser not absorbed by a fluorescence conversion sheet are output at the other side of the fluorescent film.
2. The laser-excited fluorescent material-based light source as claimed in claim 1, wherein the laser beam shaping assembly includes: a rod mirror for focusing the laser light incident on the lens from one side to the other side thereof; and an optical diffusion sheet for further changing the focused laser beam into a desired shape and size.
3. The light source of claim 2, wherein the gap between the rod mirror and the light-emitting surface of the laser diode is as small as possible and is tightly attached to the light-emitting window of the laser diode to ensure that the incident light is more incident.
4. The light source of claim 2, wherein the rod mirror has a diameter of 0.2mm to 2 mm.
5. The light source of claim 2, wherein the rod mirror is coated with an optical antireflection film and has a thickness of 10nm to 100 nm.
6. The light source of claim 2, wherein the rod mirror is made of one of quartz, K9, UV fused quartz, and sapphire.
7. The light source of claim 1, wherein the diffusion sheet is located between the rod mirror and the fluorescence wavelength conversion sheet, and has a distance of 0.1mm to 2.0mm from the surface of the rod mirror and a distance of 0.2mm to 2.0mm from the fluorescence film sheet.
8. The light source of claim 7, wherein the diffusion angle of the optical diffuser to the incident light is selected to be in a range of 0.5 to 10 degrees.
9. The light source of claim 7, wherein the optical diffuser is coated with an anti-reflection optical film with a thickness of 10nm to 100 nm.
10. The light source of claim 1, wherein the phosphor film is formed by disposing a phosphor film on a transparent substrate, and has a thickness of 0.2mm to 1 mm.
11. The light source of claim 1, wherein the laser diode emits a laser light having a wavelength in the blue wavelength band (400-470 nm) and an optical power of 0.5W to 6W.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222805518.5U CN218602907U (en) | 2022-10-26 | 2022-10-26 | Light source based on laser excitation fluorescent material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222805518.5U CN218602907U (en) | 2022-10-26 | 2022-10-26 | Light source based on laser excitation fluorescent material |
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| CN218602907U true CN218602907U (en) | 2023-03-10 |
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| CN202222805518.5U Active CN218602907U (en) | 2022-10-26 | 2022-10-26 | Light source based on laser excitation fluorescent material |
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