WO2015043521A1

WO2015043521A1 - Laser module

Info

Publication number: WO2015043521A1
Application number: PCT/CN2014/087674
Authority: WO
Inventors: 赵振宇; 巩志华; 王玉鲁; 张大为
Original assignee: 深圳极光世纪科技有限公司
Priority date: 2013-09-27
Filing date: 2014-09-28
Publication date: 2015-04-02
Also published as: CN103490267A

Abstract

A laser module, which comprises a laser base (1, 6), a plurality of lasers (4, 8) and a focusing lens cone (9), and an optical fibre socket, wherein the laser base (1, 6) can allow the plurality of lasers (4, 8) to be installed therein, thus satisfying the heat dissipation requirements thereof and the installation of a collimating lens. The lasers (4, 8) can be semiconductor lasers or solid lasers. A focusing lens group is located in the focusing lens cone (9). An optical fibre plug can be an SMA or another standard optical fibre plug. Light beams emitted from the lasers (4, 8) are collimated into parallel light via the collimating lens, are coupled via the focusing lens cone (9) and then enter an optical fibre, and are transmitted through the optical fibre and then enter a laser display system. In the laser module, a plurality of lasers (4, 8) are coupled through a multi-plate or aspherical coupling system and then enter one optical fibre. The structure adopts a modular design and is relatively compact, the processing costs of components are low, and the installation process is simple, so that the present invention is suitable for large-scale production and the low cost requirements of a laser display.

Description

Laser module

Technical field

The invention belongs to the field of laser light sources, and relates to a laser module, in particular to a laser module for multi-laser fiber coupling output, and the target application is a light source system used for laser display.

Background technique

Due to the special parameters of visible light laser, red and blue light are semiconductor lasers, and the luminous power is only the output power of 100 milliwatts to watts. The green laser is a frequency doubled laser, the output power is wattage, and the three color laser is used as the high brightness laser. The displayed light source needs to be used together to integrate multiple lasers. The current technology mainly couples multiple red, blue and green lasers into one fiber, and then combines multiple fibers into one bundle to enter the subsequent projection system. . In the laser module of the existing laser display source, for the semiconductor laser, due to the difference in beam characteristics in the two directions of the laser, a plurality of cylindrical lenses are mostly used to compress the coupled beam, and the cylindrical lens is expensive to manufacture. And the assembly process is complicated, the positioning is difficult, and it is not suitable for standardized production. For semiconductor-pumped solid-state lasers, it is difficult to couple lasers from multiple (more than two) lasers into one fiber due to the large volume of a single laser, limiting the number of lasers used in the laser display source. Limits the maximum display brightness of the laser display system.

Summary of the invention

The inventors of the present application have made the present invention in view of the above circumstances of the prior art, and the main object of the present invention is to overcome the disadvantages of the lens manufacturing system of the prior art that the manufacturing cost of the lens is too high, the assembly process is complicated, and the semiconductor pumping. A solid-state laser is difficult to be multiplexed, and provides a laser module shared by a semiconductor laser and a semiconductor-pumped solid-state laser, which has a simple structure. The advantages of low cost and simple manufacturing process. The main application area is the visible light source system for laser display.

According to an aspect of the invention, a laser module for a projection system is provided, comprising: a laser base in which a plurality of lasers are mounted; a focus lens system for using the plurality of lasers from the laser base a laser focus beam; a fiber optic socket connected between the focus lens system and the optical fiber for coupling the laser focused by the focus lens system into the optical fiber and transmitting to the projection system via the optical fiber; and a power feedback system, It is used to detect the power of the laser light output from the focus lens system, and adjust the laser output power of the plurality of lasers according to the detection result.

Advantageous effects of the present invention are mainly embodied in the following aspects: the collimating lens and the focusing lens used in the laser module of the present invention can both be ball lenses, and the laser base of the form can simultaneously satisfy the semiconductor laser TO packaging method and the semiconductor pump After the installation of the solid-state laser, after the two lasers are mounted on the base, the subsequent focusing barrel can be used universally to improve the consistency of the parts and effectively reduce the production cost. Generally speaking, the components of the laser module are simple in structure, so the processing cost is low, the assembly is simple, and the versatility is strong, which is very suitable for large-scale low-cost production of the laser display light source.

DRAWINGS

1 is a schematic diagram of a base scheme of a semiconductor laser of a laser module according to an embodiment of the present invention;

2 is a schematic diagram of a base scheme of a semiconductor solid-state laser of a laser module according to an embodiment of the present invention;

3 is a schematic structural view of a focus lens system of a laser module according to an embodiment of the present invention;

4 is a schematic structural diagram of a power feedback system of a laser module according to an embodiment of the present invention.

detailed description

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention will be described more clearly and fully hereinafter with reference to the accompanying drawings.

1 is a schematic diagram of a base scheme of a semiconductor laser of a laser module according to an embodiment of the present invention. As shown in Figure 1, the laser base 1 in this embodiment includes: a semiconductor laser fixed structure 2; Collimating lens mounting structure 3; seven semiconductor lasers 4 mounted in the fixed structure 2; collimating lens 5, which is a ball lens, placed in the collimating lens mounting structure 3, the diameter of the collimating lens mounting structure 3 and The collimating lens has the same size loose tolerance. The collimating lens uses glue or welded structure to fix the position to obtain seven collimated output beams. The seven collimated output beams are parallel to each other (in the same direction), seven beams. Parallel collimated beams ensure that the beam passes through the focusing lens system to obtain a focal spot with the smallest diameter on the projection surface. The distance between the lasers mounted in the fixed structure is based on the luminous power of the existing visible-band laser and the heat dissipation coefficient of the base material, and the calculation results yield specific values. The visible light laser for the embodiment is a visible light laser with an output power of 1 W, and the base is made of a 6061 aluminum alloy. After modeling and calculation, the mutual distance between the lasers in the fixed structure 2 can be in the range of 6.1 to 8.1 mm. Inside, preferably 7.1mm (calculated by the laser center), based on the determination of the distance, the focal length ratio between the collimating lens and the focusing lens is designed, so that the spot of the seven visible semiconductor lasers can be focused to a core diameter of 400 um. Transfer the fiber to go.

2 is a schematic diagram of a base scheme of a semiconductor solid-state laser of a laser module according to an embodiment of the present invention. As shown in FIG. 2, a laser base 6 according to another embodiment of the present invention includes a semiconductor pumped solid-state laser fixed structure 7 in which six semiconductor-pumped solid-state lasers 8 are mounted, due to high-power semiconductor waves. The heat dissipation requirement of the solid-state laser (the bottom surface is the heat-dissipation surface), so the semiconductor-pumped solid-state laser 8 is required to obtain the beam output perpendicular to the bottom surface through the internal 45° mirror to obtain six collimated output beams, which are six collimated beams. Limited to a circular range of 12 mm or less in diameter, the six collimated output beams are perpendicular to the base and output parallel to each other. Six collimated collimated beams parallel to each other ensure that the beam passes through the focus lens system described below. Focus is focused on a spot that is coincident with the focus so that it can be coupled into the fiber. The technical solution of this embodiment can be applied to an existing large power green laser for display.

3 is a schematic structural view of a focus lens system of a laser module according to an embodiment of the present invention. As shown in FIG. 3, the focus lens system according to an embodiment of the present invention includes a barrel structure 9, a focus lens group composed of

focus lenses

10 and 11. The focusing

lenses

10 and 11 are mounted in the barrel structure 9, and the concentricity of the two lenses is ensured by the barrel structure 9, and the spacers are used to ensure mutual distance between the two focusing

lenses

10 and 11, which is passed by software such as ZEMAX. To simulate calculations to achieve focus The basic function effectively eliminates unfavorable factors such as spherical aberration and effectively improves the coupling effect. The focusing lens group may also be one lens or more lenses, not limited to two.

4 is a schematic structural diagram of a power feedback system of a laser module according to an embodiment of the present invention. As shown in FIG. 4, the power feedback system in this embodiment is mounted inside the barrel structure 9, and includes a beam splitter 13, a photodiode 14, and a control circuit 15. The beam splitter 13 is fixed inside the lens barrel 9 through a base at an angle of 45° with respect to the light exiting direction. The selection of the reflectance of the beam splitter 13 needs to refer to the parameters of the photodiode 14 so as not to exceed the measurement threshold. The mounting position of the photodiode 14 is determined by the beam splitter 13. The light beam is incident on the photodiode 14 after being reflected by the beam splitter 13, and the positional accuracy is low. The output beam is reflected by the beam splitter 13, and a part of the light is output to the photodiode 14. The photodiode 14 converts the light energy into an electronic analog signal (related to the light intensity), and transmits it to the control circuit 15 through the control line, and the control circuit 15 obtains The electronic analog signal is used to monitor or control the power output of the laser. In addition, the laser light transmitted through the beam splitter 13 is coupled into the fiber and into a subsequent projection system.

From the above, the laser base according to an embodiment of the present invention can support seven semiconductor lasers, or six semiconductor-pumped solid-state lasers, which can meet the heat dissipation requirements of the laser and provide positioning for the mounting of the collimating lens.

Among them, the semiconductor laser output spot is closely arranged, the output beam is arranged in the tightest arrangement according to the hexagon, and the semiconductor laser output beam is collimated by the aspherical lens.

Among them, the output wavelength of the semiconductor pumped solid-state laser is closely arranged, and the output beam is arranged in the tightest arrangement according to the hexagon.

The focusing lens includes a lens barrel, a multi-piece lens coupling system or an aspheric lens coupling system, which can effectively reduce adverse factors such as spherical aberration and distortion.

The fiber optic socket is used for the laser module to quickly access the transmission fiber, and can be matched with various standard plugs according to different requirements.

The power feedback system includes a photodiode and a matching control circuit for monitoring or controlling the output power of the laser module, and a laser output with constant power can be obtained.

While the invention has been described with respect to the embodiments of the present invention, it is understood that Many variations or modifications are made to these embodiments. Accordingly, the scope of the invention is defined by the appended claims.

In view of the above, it will be understood by those skilled in the art that various modifications, variations and substitutions are possible in the above-described embodiments of the present invention, which fall within the scope of the invention as defined by the appended claims.

Claims

A laser module for a projection system, comprising:

a laser base in which a plurality of lasers are mounted;

a focusing lens system for focusing laser light emitted by the plurality of lasers from the laser base;

a fiber optic receptacle coupled between the focus lens system and the optical fiber for coupling the laser focused by the focus lens system to the optical fiber and transmitting to the projection system via the optical fiber;

A power feedback system for detecting the power of the laser output from the focus lens system and adjusting the laser output power of the plurality of lasers according to the detection result.
The laser module according to claim 1, wherein the laser base further comprises a laser fixing structure, a collimating lens mounting structure, and a collimating lens mounted in the collimating lens mounting structure, the plurality of lasers It is mounted in the laser fixed structure.
The laser module of claim 1, wherein the collimating lens is a ball lens, and the focusing lens system is composed of a multi-piece lens group or an aspheric lens.
The laser module of claim 1 wherein said collimating lens is a ball lens and said focusing lens system is comprised of a ball lens.
The laser module according to claim 1, wherein the plurality of lasers are arranged in a converging shape along a radius of a circle, and laser light emitted from the plurality of lasers is collectively directed to a center of the circle.

The laser base further includes a plurality of mirrors corresponding to the plurality of lasers in one-to-one correspondence for respectively outputting laser light emitted from the plurality of lasers to the focus lens system in parallel with each other.
The laser module according to claim 5, wherein the plurality of lasers are six semiconductor pumped solid-state lasers, and the six laser beams reflected by the mirror are perpendicular to the bottom surface of the laser base and output in parallel with each other. The laser beams are spaced apart from each other by less than 12 mm.
The laser module of claim 1 wherein the plurality of lasers are semiconductor lasers, solid state lasers, or other types of visible light lasers.
The laser module according to claim 1, wherein the power feedback system comprises a beam splitter that reflects a portion of the laser, a photodiode, and a control circuit.

And the power feedback system uses the photodiode to perform power detection on the laser beam reflected by the beam splitter, and transmits an electrical signal corresponding to the laser power output by the photodiode to the control circuit, thereby calculating Focus on the power of the laser output from the lens system.
The laser module of claim 1 wherein said fiber optic receptacle is an SMA 905 or FC standard plug.
The laser module according to claim 2, wherein said plurality of lasers are seven semiconductor lasers mounted in said laser fixing structure, and said collimating lens mounting structure has the same diameter as that of collimating lens The size is loose tolerance, the position of the collimating lens is fixed by glue or welded structure, and seven laser beams output from seven semiconductor lasers are parallel to each other, and the seven semiconductor lasers are fixed in the six fixed laser structures in the laser. The six vertices of the edge and the center position of the hexagon have a side length of 6.1 mm to 8.1 mm.