Miniaturized semiconductor laser optical fiber coupling module

Abstract

The utility model relates to the technical field of optical fiber lasers, and particularly provides a miniaturized semiconductor laser optical fiber coupling module which comprises a packaging box, and a COC module is arranged in the packaging box and used for emitting laser beams. A first optocoupler circuit and a second optocoupler circuit which are distributed in parallel are arranged in the packaging box, a prism is arranged between the first optocoupler circuit and the second optocoupler circuit, and the prism is provided with a 180-degree reflecting surface; the COC module is arranged on the first optocoupler circuit, and the transmitting end of the COC module corresponds to the reflecting surface of the prism; the isolator and the focusing lens are matched with the first optical fiber and the second optical fiber to form two optical coupling circuits, optical fiber coupling is achieved in two modes, and the optical fiber coupling efficiency and the fiber outlet effect are effectively improved through cooperation of the two optical coupling circuits; the two optocoupler lines are arranged in parallel and are communicated with a transmission light path through the prism, the overall structure is compact, and miniaturization of semiconductor laser products is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of optical fiber lasers, in particular to a miniaturized semiconductor laser optical fiber coupling module. Background Art

[0002] Fiber-coupled semiconductor lasers have the advantages of high electro-optical conversion efficiency, small size, high power, high reliability, etc., and therefore have broad application prospects in laser ranging, pump lasers, material processing, biomedicine and other fields.

[0003] The published Chinese patent, with publication number CN208569110U, discloses a semiconductor laser fiber coupling device, including a semiconductor laser, a fast-axis collimating lens, a slow-axis collimating lens, a first prism, a second prism, a half-wave plate, a polarization beam combiner, a coupling lens, and an optical fiber, which are sequentially arranged along an optical path. The laser light output by the semiconductor laser is collimated by the fast-axis collimating lens and the slow-axis collimating lens in sequence, and then sequentially enters the first prism and the second prism, so that the spot size of the collimated laser light in the slow-axis direction is compressed, while the spot size in the fast-axis direction remains unchanged. After the collimated laser light sequentially enters the half-wave plate and the polarization beam combiner, the spot size in the slow-axis direction is compressed again, while the spot size in the fast-axis direction remains unchanged. Finally, after coupling through the coupling lens, the compressed collimated laser light is coupled into the optical fiber.

[0004] The semiconductor laser fiber coupling device disclosed in the above patent adopts a single optical coupling line. The laser beam emitted from the semiconductor laser is easily scattered from the other end, and the fiber coupling effect is poor. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a miniaturized semiconductor laser fiber coupling module to solve the problem of poor fiber coupling effect caused by using a single optical coupling line in the prior art.

[0006] To achieve the above-mentioned and other related purposes, the present invention provides a miniaturized semiconductor laser fiber coupling module, comprising a packaging box, wherein a COC module is provided in the packaging box, wherein the COC module adopts a laser emission chip for emitting a laser beam;

[0007] The packaging box is provided with a first optocoupler circuit and a second optocoupler circuit distributed in parallel, and a prism is provided between the first optocoupler circuit and the second optocoupler circuit, and the prism has a 180° reflecting surface; the COC module is provided on the first optocoupler circuit, and the transmitting end of the COC module corresponds to the reflecting surface of the prism;

[0008] The first optical coupling circuit includes a first optical fiber, the first optical fiber extends to the rear end of the COC module, and the laser beam distributed at the rear end of the COC module is directly coupled into the first optical fiber;

[0009] The second optical coupling circuit includes an isolator, a focusing lens, and a second optical fiber arranged in sequence. The isolator is used to unidirectionally transmit the laser beam and compress the light spot. The focusing lens is used to focus the laser beam and couple the focused laser beam into the second optical fiber.

[0010] In one embodiment of the present invention, the first optical fiber and the second optical fiber are disposed on the same side of the packaging box.

[0011] In one embodiment of the present invention, the second optical coupling circuit further includes a collimating lens, and the collimating lens is distributed between the COC module and the prism.

[0012] In one embodiment of the present invention, the collimating lens is configured as a square and is used to compress the laser beam spot into a parallel beam.

[0013] In one embodiment of the present invention, a high-transmittance film is coated on the reflective surface of the prism.

[0014] In one embodiment of the present invention, a TEC semiconductor cooler is provided in the packaging box for temperature control of the optical fiber coupling environment.

[0015] As described above, the miniaturized semiconductor laser fiber coupling module of the present invention has the following beneficial effects:

[0016] 1. The present invention simultaneously sets up two parallel optical coupling lines, and adopts two methods for coupling. One is direct coupling, that is, the rear end light-emitting surface of the laser emitting chip is directly aligned with the first optical fiber, so that the light enters the first optical fiber as directly as possible; the other is focused coupling, that is, the laser beam emitted by the laser emitting chip is focused by a focusing lens, and then the focused laser beam is coupled to the second optical fiber. The two optical coupling lines couple the laser beams from both ends of the COC module respectively, effectively improving the optical fiber coupling efficiency and the fiber output effect; by setting a prism, the prism can reflect the laser beam emitted by the COC module provided in the first optical coupling line to the second optical coupling line, so that the two optical coupling lines can output the fiber from the same end of the packaging box, effectively compressing the volume of the optical fiber coupling module, thereby reducing the size of the overall laser and realizing miniaturization of the product; compared with the prior art, the present invention only uses one prism to change the propagation trajectory of the laser beam, realizes the laser beam transmission of two parallel optical coupling lines, avoids the problem of increased light propagation loss caused by excessive use of prisms, and improves the transmission quality of the laser beam.

[0017] 2. The miniaturized semiconductor laser fiber coupling module provided by the utility model adopts an isolator, a focusing lens, a first optical fiber, and a second optical fiber to form two optical coupling lines. The cooperation of the two optical coupling lines effectively improves the optical fiber coupling efficiency and the fiber output effect; the two optical coupling lines are arranged in parallel and connected to the transmission light path through a prism. The overall structure is compact, which is conducive to the miniaturization of semiconductor laser products. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Shown is a structural schematic diagram of the miniaturized semiconductor laser fiber coupling module disclosed in the present utility model.

[0019] Component number description

[0020] Package box 1; COC module 2; laser emission chip 21; first optical fiber 3; isolator 4; focusing lens 5; second optical fiber 6; collimating lens 7; prism 8; TEC semiconductor cooler 9. DETAILED DESCRIPTION

[0021] The following describes the implementation of the present invention through specific embodiments. People familiar with this technology can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0022] See also Figure 1 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of this utility model. Therefore, they have no substantive technical significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by this utility model without affecting the efficacy and purpose that can be achieved by this utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of this utility model. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of this utility model without substantially changing the technical content.

[0023] See also Figure 1 The utility model provides a miniaturized semiconductor laser fiber coupling module, including a packaging box 1, in which a COC module 2 is provided. The COC module 2 adopts a laser emitting chip 21 for emitting a laser beam.

[0024] The packaging box 1 is provided with a first optical coupling circuit and a second optical coupling circuit distributed in parallel, and a prism 8 is provided between the first optical coupling circuit and the second optical coupling circuit. The prism 8 has a 180° reflective surface, and the reflective surface of the prism 8 is coated with a high-transmittance film to reduce the mass loss during the light beam reflection process. The COC module 2 is provided on the first optical coupling circuit, and the emitting end of the COC module 2 corresponds to the reflective surface of the prism 8, so that the laser beam emitted by the COC module 2 is combined and reflected into the second optical coupling circuit. The design of the prism can reflect the laser beam emitted by the COC module 2 provided on the first optical coupling circuit to the second optical coupling circuit, so that the two optical coupling circuits can be output from the same end of the packaging box 1, effectively compressing the volume of the fiber coupling module, thereby reducing the size of the overall laser, and facilitating the miniaturization of the product. Compared with the prior art, the present invention only uses one prism 8 to change the propagation trajectory of the laser beam, realizing the laser beam transmission of two parallel optical coupling circuits, avoiding the problem of increased light propagation loss caused by excessive use of prisms 8, and improving the transmission quality of the laser beam.

[0025] The first optical coupling circuit includes a first optical fiber 3, which extends to the rear end of the COC module 2. The laser beam distributed at the rear end of the COC module 2 is directly coupled into the first optical fiber 3. The second optical coupling circuit includes an isolator 4, a focusing lens 5, and a second optical fiber 6, which are arranged in sequence. The isolator 4 is used to unidirectionally transmit the laser beam and compress the light spot. The focusing lens 5 is used to focus the laser beam and couple the focused laser beam into the second optical fiber 6. The second optical coupling circuit also includes a collimating lens 7, which is distributed between the COC module 2 and the prism 8. The collimating lens 7 is designed to be square and is used to compress the laser beam spot into a parallel beam. The first optical fiber 3 and the second optical fiber 6 are arranged on the same side of the packaging box 1. The present invention also sets up two parallel optical coupling lines, and adopts two coupling methods. One is direct coupling, that is, the rear end light-emitting surface of the laser emitting chip 21 is directly aligned with the first optical fiber 3, so that the light enters the first optical fiber 3 as directly as possible; the other is focused coupling, that is, the laser beam emitted by the laser emitting chip 21 is focused by using the focusing lens 5, and then the focused laser beam is coupled to the second optical fiber 6. The two optical coupling lines couple the laser beams from the two ends of the COC module 2 respectively, effectively improving the optical fiber coupling efficiency and the fiber output effect.

[0026] The packaging box 1 is provided with a TEC semiconductor cooler 9. The TEC semiconductor cooler can work based on the Peltier effect, that is, when a DC current passes through a galvanic couple composed of two different semiconductor materials, one end absorbs heat and the other end releases heat. This effect enables the TEC to both cool and heat by changing the direction of the current. In the packaging box 1, the TEC semiconductor cooler 9 is mainly used to control the temperature of the optical device to maintain the stability of its operating wavelength and ensure optimal performance, effectively control the temperature of the fiber coupling environment, and further improve the fiber coupling effect.

[0027] In summary, the miniaturized semiconductor laser fiber coupling module provided by the present invention utilizes an isolator 4 and a focusing lens 5 in conjunction with a first optical fiber 3 and a second optical fiber 6 to form two optical coupling lines. These two optical coupling lines effectively improve fiber coupling efficiency and fiber output performance. The two optical coupling lines are arranged in parallel and connected through a prism 8 for the transmission optical path, resulting in a compact overall structure that facilitates the miniaturization of semiconductor laser products. Therefore, the present invention effectively overcomes the shortcomings of existing technologies and possesses high industrial value.

[0028] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed in the present invention are intended to be covered by the claims of the present invention.

Claims

1. A miniaturized semiconductor laser fiber coupling module, comprising a packaging box (1), wherein a COC module (2) is provided in the packaging box (1), and the COC module (2) uses a laser emission chip (21) for emitting a laser beam; Its characteristics are: The packaging box (1) is provided with a first optocoupler circuit and a second optocoupler circuit distributed in parallel, a prism (8) is provided between the first optocoupler circuit and the second optocoupler circuit, and the prism (8) has a 180° reflection surface; the COC module (2) is provided on the first optocoupler circuit, and the emission end of the COC module (2) corresponds to the reflection surface of the prism (8); The first optical coupling circuit comprises a first optical fiber (3), the first optical fiber (3) extending to the rear end of the COC module (2), and the laser beam distributed at the rear end of the COC module (2) being directly coupled into the first optical fiber (3); The second optical coupling circuit comprises an isolator (4), a focusing lens (5), and a second optical fiber (6) which are arranged in sequence. The isolator (4) is used for unidirectionally transmitting a laser beam and compressing a light spot. The focusing lens (5) is used for focusing the laser beam and coupling the focused laser beam into the second optical fiber (6).

2. The miniaturized semiconductor laser fiber coupling module according to claim 1, characterized in that: The first optical fiber (3) and the second optical fiber (6) are arranged on the same side of the packaging box (1).

3. The miniaturized semiconductor laser fiber coupling module according to claim 1, wherein: The second optical coupling circuit further includes a collimating lens (7), and the collimating lens (7) is distributed between the COC module (2) and the prism (8).

4. The miniaturized semiconductor laser fiber coupling module according to claim 3, characterized in that: The collimating lens (7) is set to be square and is used to compress the laser beam spot into a parallel beam.

5. The miniaturized semiconductor laser fiber coupling module according to claim 1, wherein: The reflective surface of the prism (8) is plated with a high-transmittance film.

6. The miniaturized semiconductor laser fiber coupling module according to claim 1, wherein: The packaging box (1) is provided with a TEC semiconductor cooler (9) for controlling the temperature of the optical fiber coupling environment.

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