WO2018188118A1

WO2018188118A1 - Laser excitation device and excitation method therefor

Info

Publication number: WO2018188118A1
Application number: PCT/CN2017/081947
Authority: WO
Inventors: 夏泽强
Original assignee: 广州市新晶瓷材料科技有限公司
Priority date: 2017-04-14
Filing date: 2017-04-26
Publication date: 2018-10-18
Also published as: CN108736298A

Abstract

Provided is a laser excitation device, comprising a laser excitation apparatus (1), and an optical conversion medium (2) arranged facing a laser-emergent end (11) of the laser excitation apparatus (1) and maintaining a set distance from the laser excitation apparatus (1), wherein the optical conversion medium (2) can absorb the laser emitted from the laser excitation apparatus (1) and acquire an emergent light source with a desired colour temperature. The laser excitation device further comprises a reflective film (3), used for reflecting the emergent light source, plated on a plane directly facing a light incident face of the optical conversion medium (2). The laser excitation device overcomes the defect of the poor light source quality of an emergent light source caused by existing lasers being excited by means of an optical conversion medium (2) with a back side for irradiation and a front side for light emission, while the device excites the optical conversion medium (2) with a front side for irradiation and a back side for light emission, thus having the advantages of a uniform emergent light source and good quality.

Description

Laser excitation device and excitation method thereof

Technical field

The invention relates to a laser excitation device and an excitation method thereof, in particular to a laser reflection excitation laser white light source device and an excitation method thereof, which are applied in the field of illumination.

Background technique

The conventional laser excitation generally illuminates the light conversion medium on the side facing away from the light exit surface of the light conversion medium, and the emitted light source of the desired color temperature is emitted from the front surface (ie, the light exit surface) of the light conversion medium. However, since the intensity of the laser light is much stronger than that of the general beam, and the spot is relatively concentrated, it is easy to cause unevenness in color and poor brightness of the edge of the outgoing light source, which affects the quality of the light source of the outgoing light source. Therefore, it is a matter of urgency to provide a laser excitation device and a method for exciting the same with positive front light, uniform light source, good brightness and good quality.

Summary of the invention

In order to overcome the disadvantages of the poor quality of the light source of the outgoing light source and the poor brightness caused by the back surface illumination of the excitation light conversion medium by the existing laser, the present invention provides a laser excitation device and an excitation method thereof, which adopts a front illumination front surface. The light source is obtained by the light source, and has the advantages that the light source is uniform, the brightness is good, and the quality is good.

The technical solution of the present invention is as follows:

A laser excitation device comprising a laser excitation device and a light conversion medium disposed facing the laser exit end of the laser excitation device and maintaining a set spacing (typically between 1 mm and 30 cm) with the laser excitation device, The light conversion medium can absorb the laser light emitted by the laser excitation device to obtain an exit light source of a desired color temperature. The light conversion medium is a polyhedron; a light exit surface of the light conversion medium faces a laser exit end of the laser excitation device, and the laser excitation device is offset from a central axis position of the light conversion medium; A reflective film for reflecting the exit light source, which is plated on at least one of the other surfaces of the light conversion medium except the light incident surface.

The laser excitation device of the present application is different from the incident surface of the light conversion medium except the light incident surface, which is different from the method of the prior art laser excitation device for emitting an illumination source that is excited by the back side of the light conversion medium to obtain a desired color temperature from the front side thereof. At least one side is plated with a reflective film that is absorbed by the light conversion medium after being incident on the front side of the light conversion medium to obtain an exit light source of a desired color temperature, and is reflected by the reflective film when the exit light source reaches the position of the reflective film. It effectively overcomes the shortcomings of uneven color and poor brightness due to the fact that the laser beam is too strong and the spot is relatively concentrated. The laser excitation device has a uniform light source and good brightness and good quality.

The laser emitted by the laser excitation device contains at least a laser having a wavelength range of 200-470 nm, and the light conversion The emission spectrum of the medium is one or more spectral combinations between 460-800 nm, and the light conversion medium absorbs the laser light to obtain a laser white light exiting light source of 1500-8000 K color temperature, the reflective film being 400-800 nm Reflective film.

A laser white light source having a color temperature of 1500-8000K is obtained by using the above laser and the light conversion medium, and a reflection film of 400-800 nm is disposed, which can reflect the laser white light source (the laser white light is The light is mixed in various wavelengths in the wavelength range of 400-800 nm, so that the emitted laser white light is uniform, the brightness is good, and the quality is good.

The light conversion medium is any one of a fluorescent glass, a transparent fluorescent ceramic, a fluorescent single crystal, or a phosphor block.

The phosphor block is formed by mixing and solidifying a phosphor with a transparent glue. Among them, the light conversion medium is preferably a fluorescent glass, a transparent fluorescent ceramic, or a fluorescent single crystal. Since the energy of the 200-470 nm laser is high, if the light conversion medium uses a fluorescent sheet made of a conventional phosphor plus silica gel, it will be colored by the high temperature generated by the laser in the case of receiving the laser irradiation for a long period of time. Changes and failures, shortening the life of the light source, resulting in unstable light quality. When the light conversion medium adopts any one of fluorescent glass, transparent fluorescent ceramics and fluorescent single crystal, the visible light transmittance is high and the property is stable, and the light emitted by the light source can be converted into a kind of light efficiently and stably. The standard application of white light, long life of the light source and stable light quality, greatly saving costs.

The light conversion medium is any one of a fluorescent glass, a transparent fluorescent ceramic or a fluorescent single crystal, and the fluorescent glass, the transparent fluorescent ceramic or the fluorescent single crystal is an aluminate, a nitride, an oxide, an oxynitride, or a silicic acid. Any of a salt, phosphate, sulfate or tungstate system.

Fluorescent glass, transparent fluorescent ceramics or fluorescent single crystals prepared using aluminate, nitride, oxide, oxynitride, silicate, phosphate, sulfate or tungstate systems have higher excitation conversion efficiencies.

The light conversion medium is a cube or a rectangular parallelepiped or a cylinder.

The preferred shape of the light converting medium has higher reflection efficiency and good light source quality.

The light-emitting surface of the light conversion medium is coated with an anti-reflection film of 400-800 nm capable of improving the light-emitting effect of the light source.

The antireflection film has an effect of increasing the transmittance of the light source in the wavelength range of 400-800 nm in the obtained light source, thereby further improving the brightness and quality of the exit light source.

The laser excitation device is any one of a solid laser, a fiber laser or a semiconductor laser or any combination thereof. When a plurality of laser excitation devices are combined, the laser emitted by the laser excitation device is combined or concentrated. Convert the medium to light.

The excitation method of the above laser excitation device includes: the laser light emitted from the laser excitation device is irradiated to the light conversion medium, and is absorbed by the light conversion medium to obtain an exit light source of a desired color temperature, and the excitation method further includes the emission light source. When it reaches the position of the reflective film, it is reflected by the reflective film.

The excitation method of the laser excitation device of the present application is different from the conventional laser excitation method of using the back side illumination front light, but the front side illumination front light is used, and the obtained light source of the desired color temperature is reflected by adding a reflection film to achieve The purpose of uniformizing the outgoing light source and improving the brightness and quality of the light source.

The laser excitation device emits at least a laser having a wavelength range of 200-470 nm to the light conversion medium, and the light conversion medium having an emission spectrum of one or more spectral combinations between 460 and 800 nm absorbs the light Laser, laser light source with a color temperature of 1500-8000K.

The laser cooperates with a specific conversion spectrum of the light conversion medium to obtain a relatively pure laser white light exiting light source of 1500-8000K color temperature.

Compared with the prior art, the present invention has the following advantages:

1) The laser excitation device and the excitation method thereof of the present application adopt a frontal illumination of the front side light, instead of the conventional back surface illumination method, and are plated on at least one of the other surfaces except the light incident surface of the light conversion medium. The way of reflecting the film makes the outgoing light source uniform and has good brightness and good quality;

2) a preferred laser and a light converting medium having a specific emission wavelength can obtain a high quality laser white light emitting source of 1500-8000 K color temperature;

3) The anti-reflection film is arranged so that the transmittance of the exiting light source is better, and the brightness and quality of the light source can be further improved.

DRAWINGS

1 is a schematic structural view of Embodiment 1 of a laser excitation device according to the present invention;

Figure 2 is a cross-sectional view showing the A-A of the optical conversion medium of the laser excitation device of the present invention;

Figure 3 is a cross-sectional view showing the A'-A' of the optical conversion medium of the laser excitation device of the present invention;

4 is a schematic structural view of Embodiment 2 of the laser excitation device according to the present invention;

Figure 5 is a cross-sectional view showing the A-A of the optical conversion medium of the laser excitation device of the present invention;

6 is a schematic structural view of Embodiment 3 of the laser excitation device according to the present invention;

Figure 7 is a cross-sectional view showing the A-A of the optical conversion medium of the laser excitation device of the third embodiment of the present invention;

Figure 8 is a cross-sectional view showing the A'-A' of the optical conversion medium of the laser excitation device of the present invention;

9 is a schematic structural view of a laser excitation device according to Embodiment 4 of the present invention when the light conversion medium is a rectangular parallelepiped;

Figure 10 is a cross-sectional view of the light-emitting medium of the embodiment 4 of the laser excitation device according to the present invention, when the light conversion medium is a rectangular parallelepiped;

Figure 11 is a cross-sectional view showing the A'-A' of the light-converting medium when the light-converting medium is a rectangular parallelepiped in Embodiment 4 of the laser excitation apparatus according to the present invention;

12 is a schematic structural view of a laser excitation device according to Embodiment 4 of the present invention when the light conversion medium is a square body;

Figure 13 is a cross-sectional view of the optical conversion medium of the laser excitation device of the fourth embodiment of the present invention when the light conversion medium is a square;

Figure 14 is a cross-sectional view showing the A'-A' of the light-converting medium when the light-converting medium is a square body according to Embodiment 4 of the laser excitation device of the present invention;

15 is a schematic structural view of a laser excitation device according to Embodiment 5 of the present invention when the light conversion medium is a rectangular parallelepiped;

Figure 16 is a cross-sectional view of the light-emitting medium of the fifth embodiment of the laser excitation device according to the present invention, when the light conversion medium is a rectangular parallelepiped;

Figure 17 is a cross-sectional view showing the A'-A' of the light-converting medium when the light-converting medium is a rectangular parallelepiped in the fifth embodiment of the laser excitation device according to the present invention;

18 is a schematic structural view of a laser excitation device according to Embodiment 5 of the present invention when the light conversion medium is a square body;

Figure 19 is a cross-sectional view showing the light-emitting medium of the embodiment 5 of the laser excitation device according to the present invention, when the light conversion medium is a square;

Figure 20 is a cross-sectional view showing the A'-A' of the light-converting medium when the light-converting medium is a square body according to Embodiment 5 of the laser excitation device of the present invention;

21 is a schematic structural view of Embodiment 6 of the laser excitation device according to the present invention;

Figure 22 is a cross-sectional view along line A-A of the light conversion medium of Example 6 of the laser excitation device according to the present invention;

Figure 23 is a cross-sectional view taken along line A'-A' of the light-converting medium of Example 6 of the laser excitation device according to the present invention.

Label description:

The laser excitation device 1, the light conversion medium 2, the reflection film 3, the laser light exit end 11, the light exit surface 21, and the antireflection film 22.

detailed description

The technical solution of the present invention will be described in detail below with reference to the accompanying drawings 1-23.

Example 1

As shown in FIG. 1-3, a laser excitation device according to the present invention includes a laser excitation device 1 and a laser output end 11 facing the laser excitation device 1 and is set with the laser excitation device 1 A pitched light-converting medium 2 capable of absorbing laser light emitted from the laser excitation device 1 to obtain an exit light source of a desired color temperature. The light conversion medium 2 is a hexahedron. The light exit surface 21 of the light conversion medium 2 faces the laser exit end 11 of the laser excitation device 1, and the laser excitation device 1 is offset from the central axis position of the light conversion medium 2; the laser excitation device further includes plating A reflective film 3 for reflecting the outgoing light source on a plane opposite to the light incident surface of the light conversion medium 2 is formed.

The excitation method of the laser excitation device includes the laser light emitted from the laser excitation device 1 after being irradiated to the light conversion medium 2, and absorbed by the light conversion medium 2 to obtain an exit light source of a desired color temperature. The excitation method further includes the exiting light source being reflected by the reflective film 3 when it reaches the position of the reflective film 3.

Example 2

As shown in FIG. 4-5, a laser excitation device according to the present invention includes a laser excitation device 1 and a laser output end 11 facing the laser excitation device 1 and is set with the laser excitation device 1. A pitched light-converting medium 2 capable of absorbing laser light emitted from the laser excitation device 1 to obtain an exit light source of a desired color temperature. The light conversion medium 2 is a pentahedron. The light exit surface 21 of the light conversion medium 2 faces the laser exit end 11 of the laser excitation device 1, and the laser excitation device 1 is offset from the central axis position of the light conversion medium 2; the laser excitation device further includes plating A reflective film 3 for reflecting the outgoing light source on a plane adjacent to the light incident surface of the light conversion medium 2.

The laser emitted from the laser excitation device 1 contains at least a laser having a wavelength range of 200-470 nm, and the emission spectrum of the optical conversion medium 2 is one or more spectral combinations of 460-800 nm, the light The conversion medium 2 absorbs the laser light to obtain a laser white light exiting light source of a color temperature of 1500-8000 K, and the reflective film 3 is a reflective film of 400-800 nm.

The excitation method of the laser excitation device includes the laser light emitted from the laser excitation device 1 after being irradiated to the light conversion medium 2, and absorbed by the light conversion medium 2 to obtain an exit light source of a desired color temperature. The excitation method further includes the exiting light source being reflected by the reflective film 3 when it reaches the position of the reflective film 3. The laser excitation device 1 emits a laser light to the light conversion medium 2 containing at least a wavelength range of 200-470 nm, and the emission spectrum is one or more spectral combinations of light conversion medium between 460 and 800 nm. 2 Absorbing the laser to obtain a laser white light exiting light source of 1500-8000K color temperature.

Example 3

As shown in FIGS. 6-8, a laser excitation device according to the present invention includes a laser excitation device 1 and a laser output end 11 facing the laser excitation device 1 and is set with the laser excitation device 1 A pitched light-converting medium 2 capable of absorbing laser light emitted from the laser excitation device 1 to obtain an exit light source of a desired color temperature. The light conversion medium 2 is an octahedron. The light exit surface 21 of the light conversion medium 2 faces the laser exit end 11 of the laser excitation device 1, and the laser excitation device 1 is offset from the central axis position of the light conversion medium 2; the laser excitation device further includes plating A reflective film 3 for reflecting the outgoing light source on two planes adjacent to the light incident surface of the light conversion medium 2 and facing itself is formed.

The light conversion medium 2 is a phosphor block.

The excitation method of the laser excitation device includes the laser light emitted by the laser excitation device 1 to the light conversion medium After the mass 2, it is absorbed by the light conversion medium 2 to obtain an exit light source of a desired color temperature. The excitation method further includes the exiting light source being reflected by the reflective film 3 when it reaches the position of the reflective film 3. The laser excitation device 1 emits a laser light to the light conversion medium 2 containing at least a wavelength range of 200-470 nm, and the emission spectrum is one or more spectral combinations of light conversion medium between 460 and 800 nm. 2 Absorbing the laser to obtain a laser white light exiting light source of 1500-8000K color temperature.

Example 4

As shown in FIGS. 9-14, a laser excitation device according to the present invention includes a laser excitation device 1 and a laser output end 11 facing the laser excitation device 1 and is set with the laser excitation device 1 A pitched light-converting medium 2 capable of absorbing laser light emitted from the laser excitation device 1 to obtain an exit light source of a desired color temperature. The light conversion medium 2 is a cube or a rectangular parallelepiped. The light exit surface 21 of the light conversion medium 2 faces the laser exit end 11 of the laser excitation device 1, and the laser excitation device 1 is offset from the central axis position of the light conversion medium 2; the laser excitation device further includes plating A reflective film 3 for reflecting the outgoing light source on all other faces except the light incident surface of the light conversion medium 2.

The light conversion medium 2 is any one of a fluorescent glass, a transparent fluorescent ceramic or a fluorescent single crystal, and the fluorescent glass, the transparent fluorescent ceramic or the fluorescent single crystal is an aluminate, a nitride, an oxide, an oxynitride, or a silicon. Any of an acid salt, phosphate, sulfate or tungstate system.

Example 5

As shown in FIGS. 15-20, a laser excitation device according to the present invention includes a laser excitation device 1 and a laser output end 11 facing the laser excitation device 1 and is set with the laser excitation device 1 A pitched light-converting medium 2 capable of absorbing laser light emitted from the laser excitation device 1 to obtain an exit light source of a desired color temperature. The light conversion medium 2 is a cube or a rectangular parallelepiped. The light exit surface 21 of the light conversion medium 2 faces the laser exit end 11 of the laser excitation device 1, and the laser excitation device 1 is offset from the central axis position of the light conversion medium 2; The light excitation device further includes a reflective film 3 for plating the outgoing light source on all other faces except the light incident surface of the light conversion medium 2.

The light-emitting surface 21 of the light-converting medium 2 is coated with an anti-reflection film 22 of 400-800 nm which can enhance the light-emitting effect of the light-emitting source.

Example 6

As shown in FIGS. 21-23, a laser excitation apparatus according to the present invention includes a laser excitation device 1 and a laser output end 11 facing the laser excitation device 1 and maintained with the laser excitation device 1 A pitched light-converting medium 2 capable of absorbing laser light emitted from the laser excitation device 1 to obtain an exit light source of a desired color temperature. The light conversion medium 2 is a cylinder. The light exit surface 21 of the light conversion medium 2 faces the laser exit end 11 of the laser excitation device 1, and the laser excitation device 1 is offset from the central axis position of the light conversion medium 2; the laser excitation device further includes plating A reflective film 3 for reflecting the outgoing light source on the opposite side of the light incident surface of the light conversion medium 2.

The light exit surface 21 of the light conversion medium 2 is plated with an anti-reflection of 400-800 nm which can enhance the light-emitting effect of the outgoing light source. Membrane 22.

The laser excitation device and the excitation method thereof according to the present invention are not limited to the above embodiments, and any improvement or substitution according to the principles of the present invention should be within the scope of the present invention.

Claims

A laser excitation device comprising a laser excitation device (1) and a light conversion disposed opposite the laser exit end (11) of the laser excitation device (1) and maintaining a set spacing from the laser excitation device (1) a medium (2) capable of absorbing laser light emitted by the laser excitation device (1) to obtain an exit light source of a desired color temperature, characterized in that the light conversion medium (2) is a polyhedron The light exit surface (21) of the light conversion medium (2) faces the laser exit end (11) of the laser excitation device (1), and the laser excitation device (1) deviates from the light conversion medium (2) a central axis position; the laser excitation device further includes a reflective film (3) for reflecting at least one of the other surfaces of the light conversion medium (2) except the light incident surface (3) .
The laser excitation device according to claim 1, characterized in that the laser emitted from the laser excitation device (1) contains at least a laser having a wavelength in the range of 200-470 nm, and an emission spectrum of the optical conversion medium (2) For one or more spectral combinations between 460 and 800 nm, the light conversion medium (2) absorbs the laser light to obtain a laser white light exiting light source of 1500-8000 K color temperature, and the reflective film (3) is 400- 800 nm reflective film.
The laser excitation apparatus according to claim 2, wherein the light conversion medium (2) is any one of a fluorescent glass, a transparent fluorescent ceramic, a fluorescent single crystal, or a phosphor block.
The laser excitation device according to claim 3, wherein the light conversion medium (2) is any one of fluorescent glass, transparent fluorescent ceramic or fluorescent single crystal, the fluorescent glass, transparent fluorescent ceramic or fluorescent single The crystal is any one of an aluminate, nitride, oxide, oxynitride, silicate, phosphate, sulfate or tungstate system.
The laser excitation device according to claim 3, characterized in that the light conversion medium (2) is a square or a rectangular parallelepiped or a cylinder.
The laser excitation device according to claim 2, characterized in that the light exit surface (21) of the light conversion medium (2) is coated with an anti-reflection film of 400-800 nm capable of enhancing the light-emitting effect of the outgoing light source (22) .
The excitation method of the laser excitation device according to any one of claims 1 to 6, comprising the laser light emitted from the laser excitation device (1) being irradiated to the light conversion medium (2), and being subjected to the light conversion medium (2) An exiting light source that absorbs and obtains a desired color temperature, characterized in that the excitation method further comprises the exiting light source being reflected by the reflective film (3) when it reaches the position of the reflective film (3).
The method for exciting a laser excitation device according to claim 7, characterized in that the laser excitation device (1) emits laser light containing at least a wavelength range of 200-470 nm to the light conversion medium (2). The light conversion medium (2) having an emission spectrum of one or more spectral combinations between 460 and 800 nm absorbs the laser light to obtain a laser white light exiting light source of 1500-8000 K color temperature.