Semiconductor laser light beam collimation device

Abstract

The utility model discloses a light beam collimating device of a semiconductor laser, which is used for collimating light beams emitted by the semiconductor laser and comprises a cylindrical lens and a compound lens. The cylindrical lens and the composite lens are both arranged in the light beam propagation direction of the semiconductor laser. By adopting the device, the light beams emitted by the semiconductor laser can be collimated, and the collimation effect is better.

Description

Technical Field

[0001] The utility model relates to the technical field of semiconductor lasers, in particular to a semiconductor laser light beam collimation device. Background Art

[0002] Semiconductor lasers, also known as laser diodes, are lasers that use semiconductor materials as working materials. In related technologies, since the light beams emitted by semiconductor lasers have a large divergence angle and are asymmetric, with a large fast axis divergence angle and a small slow axis divergence angle, the light intensity distribution is uneven and the beam quality is poor. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a semiconductor laser beam collimation device, which can realize the collimation of the light beam emitted by the semiconductor laser, and the collimation effect is better.

[0004] In order to solve the above problems, the first aspect of the utility model provides a semiconductor laser beam collimation device for collimating the light beam emitted by the semiconductor laser. The device includes: a cylindrical lens and a compound lens, and the cylindrical lens and the compound lens are both arranged in the propagation direction of the light beam of the semiconductor laser.

[0005] According to the semiconductor laser beam collimation device of the utility model, the cylindrical lens and the compound lens are both arranged in the beam propagation direction of the semiconductor laser. Thus, the combination of the cylindrical lens and the compound lens can not only realize the collimation of the light beam emitted by the semiconductor laser, but also can realize the doubly collimation of the light beam emitted by the semiconductor laser, thereby effectively improving the light beam collimation effect.

[0006] In some embodiments, the cylindrical lens is located on the light-emitting side of the semiconductor laser, and the optical axis direction of the cylindrical lens is perpendicular to the fast axis direction of the light beam emitted by the semiconductor laser.

[0007] In some embodiments, the compound lens is located at the light-emitting side of the cylindrical lens, and the optical axis direction of the compound lens coincides with the optical axis direction of the semiconductor laser.

[0008] In some embodiments, the cylindrical lens is located at the light-emitting side of the composite lens, and the optical axis direction of the cylindrical lens is perpendicular to the fast axis direction of the light beam emitted by the semiconductor laser.

[0009] In some embodiments, the compound lens is located on the light-emitting side of the semiconductor laser, and the optical axis direction of the compound lens coincides with the optical axis direction of the semiconductor laser.

[0010] In some embodiments, the light incident side of the compound lens is a cylinder, and the light emitting side of the compound lens is a rotational curved surface; or, the light incident side of the compound lens is a rotational curved surface, and the light emitting side of the compound lens is a cylinder.

[0011] In some embodiments, a generatrix of the cylindrical surface is perpendicular to a fast axis direction of a light beam emitted by the semiconductor laser.

[0012] In some embodiments, the optical axis direction of the rotational curved surface coincides with the optical axis direction of the semiconductor laser.

[0013] In some embodiments, the cylindrical lens is a single cylindrical lens or a double cylindrical lens.

[0014] In some embodiments, the device further comprises: a fast axis compression lens, which is arranged in the propagation direction of the light beam of the semiconductor laser and is used to compress the fast axis direction of the light beam emitted by the semiconductor laser.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 It is a structural schematic diagram of a semiconductor laser beam collimation device according to an embodiment of the utility model;

[0018] Figure 2 It is a schematic diagram of the use of a semiconductor laser beam collimation device according to an embodiment of the utility model;

[0019] Figure 3 It is a schematic diagram of an emission light beam of a semiconductor laser according to an embodiment of the utility model.

[0020] Reference numerals:

[0021] Semiconductor laser beam collimation device 10; semiconductor laser 1; cylindrical lens 2; compound lens 3. DETAILED DESCRIPTION

[0022] The embodiments of the present utility model are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present utility model are described in detail below.

[0023] In the related art, there are three methods for collimating semiconductor laser beams. One is to use a cylindrical lens to perform angle collimation and shaping in the fast and slow axis directions. However, due to the small adjustment tolerance of the cylindrical lens, although the beam quality is improved after shaping, its divergence angle is still large, which cannot well meet the requirements of the laser radar for the emitting light source; the other method uses a single lens to collimate the output beam of the semiconductor laser. This semiconductor laser beam shaping device is a traditional collimation and shaping method with a simple structure, convenience and economy, but the effect is poor and the collimation degree is low; there is also a method of using a transmitting telescope to collimate the output beam of the semiconductor laser. The semiconductor laser beam is expanded by a telescope with a magnification factor to achieve the purpose of compressing the divergence angle. This method can achieve a good collimation effect, but the main disadvantages of the semiconductor laser beam shaping device are that the telescope used is large in size, complex in structure, high in cost, and large in size, and the optical and mechanical stability of the entire beam expansion device is poor, and it is easily affected by other factors.

[0024] In order to solve the above problems, a first embodiment of the utility model provides a semiconductor laser beam collimation device, which can realize the collimation of the light beam emitted by the semiconductor laser, and the collimation effect is better.

[0025] Reference below Figure 1 Describe the semiconductor laser beam collimation device of the utility model embodiment

[0026] like Figure 1 As shown, the semiconductor laser beam collimation device 10 is used to collimate the light beam emitted by the semiconductor laser 1. The semiconductor laser beam collimation device 10 includes a cylindrical lens 2 and a compound lens 3. The cylindrical lens 2 and the compound lens 3 are both arranged in the light beam propagation direction of the semiconductor laser 1.

[0027] Among them, reference Figure 1 As shown, the cylindrical lens 2 includes a light incident side 21 and a light exiting side 22. In some embodiments, the cylindrical lens 2 can be a single cylindrical lens or a double cylindrical lens, which is not limited. Preferably, the cylindrical surface of the cylindrical lens 2 can be a spherical surface to reduce costs and facilitate processing.

[0028] The compound lens 3 refers to a lens composed of two or more single lenses. Figure 1 As shown, the composite lens 3 includes a light incident side 31 and a light exiting side 32, wherein the light incident side 31 and the light exiting side 32 adopt different single lenses, thereby compensating the aberration effect existing in the single lens to the greatest extent by using a combination of simple lenses with complementary aberrations.

[0029] Based on the above-mentioned method of combining the cylindrical lens 2 and the compound lens 3, as shown in FIG. Figure 2As shown, for the emission light beam of the semiconductor laser 1 in the slow axis direction, due to the large light-emitting surface, the light-emitting side 32 of the compound lens 3 can be collimated in the slow axis direction; for the emission light beam of the semiconductor laser 1 in the fast axis direction, due to its large divergence angle due to the diffraction effect, but the beam quality is good, the cylindrical lens 2 and the light-entering side 31 of the compound lens 3 can be double-collimated, that is, multiple optical surfaces are used to work together to collimate the light beam in the fast axis direction, thereby effectively improving the light utilization rate in the fast axis direction and improving the collimation effect. Therefore, compared with the method of using a transmitting telescope to collimate the output light beam of the semiconductor laser, the semiconductor laser beam collimation device 10 of the present application has the advantages of relatively simple structure, good output light beam collimation effect, and high light beam output efficiency, and can collimate the light beams in the fast axis direction and the slow axis direction respectively, and is suitable for realizing collimated light spots with arbitrary aspect ratios.

[0030] In some embodiments, there is no limitation on the number of cylindrical lenses 2 or compound lenses 3 .

[0031] According to the semiconductor laser beam collimation device 10 of the utility model, the cylindrical lens 2 and the compound lens 3 are both arranged in the beam propagation direction of the semiconductor laser 1. Thus, the combination of the cylindrical lens 2 and the compound lens 3 can not only realize the collimation of the light beam emitted by the semiconductor laser 1, but even can realize the doubly collimation of the light beam emitted by the semiconductor laser 1, thereby effectively improving the light beam collimation effect.

[0032] In some embodiments, Figure 1 As shown, the cylindrical lens 2 is located at the light-emitting side of the semiconductor laser 1, and the optical axis direction of the cylindrical lens 2 is perpendicular to the fast axis direction of the light beam emitted by the semiconductor laser 1. In other words, the cylindrical lens 2 is located right in front of the light-emitting point of the semiconductor laser 1, and the optical axis of the cylindrical lens 2 is perpendicular to the fast axis of the light beam emitted by the semiconductor laser 1, that is, the generatrix of the cylindrical lens 2 is perpendicular to the fast axis direction of the semiconductor laser 1.

[0033] In some embodiments, Figure 1 As shown, the compound lens 3 is located on the light-emitting side of the cylindrical lens 2, and the optical axis direction of the compound lens 3 coincides with the optical axis direction 4 of the semiconductor laser 1. In other words, the compound lens 3 is located directly in front of the cylindrical lens 2, and the optical axis of the compound lens 3 coincides with the central emission optical axis of the light-emitting surface of the semiconductor laser 1.

[0034] By setting the positions of the cylindrical lens 2 and the compound lens 3 as mentioned above, that is, the cylindrical lens 2 is set between the compound lens 3 and the semiconductor laser 1, thereby, on the one hand, the emitted light beam in the fast axis direction can be doubly collimated by the cylindrical lens 2 and the light incident side 31 of the compound lens 3, and on the other hand, the emitted light beam in the slow axis direction can be collimated by the light emitting side 31 of the compound lens 3 with a longer focal length, thereby realizing the separate collimation of the light beams in the fast axis direction and the slow axis direction, being suitable for realizing a collimated light spot with any aspect ratio, and improving the light beam collimation effect and the light beam emission efficiency.

[0035] In some embodiments, the cylindrical lens 2 is located at the light-emitting side of the compound lens 3 , and the optical axis direction of the cylindrical lens 2 is perpendicular to the fast axis direction of the light beam emitted by the semiconductor laser 1 .

[0036] In some embodiments, the compound lens 3 is located at the light-emitting side of the semiconductor laser 1 , and the optical axis direction of the compound lens 3 coincides with the optical axis direction of the semiconductor laser 2 .

[0037] By setting the positions of the cylindrical lens 2 and the compound lens 3 as mentioned above, that is, the compound lens 3 is set between the cylindrical lens 2 and the semiconductor laser 1, thereby, on the one hand, the cylindrical lens 2 and the light incident side 31 of the compound lens 3 can perform doubly collimation on the emission light beam in the fast axis direction, and on the other hand, the light emitting side 31 of the compound lens 3 can collimate the emission light beam in the slow axis direction, thereby realizing the separate collimation of the light beams in the fast axis direction and the slow axis direction, being suitable for realizing a collimated light spot with any aspect ratio, and improving the light beam collimation effect and the light beam emission efficiency.

[0038] In some embodiments, the light-entering side of the compound lens 3 is a cylindrical surface, and the light-exiting side of the compound lens 3 is a rotational curved surface; or, the light-entering side of the compound lens 3 is a rotational curved surface, and the light-exiting side of the compound lens 3 is a cylindrical surface. Thus, by combining the cylindrical surface and the rotational curved surface, the effect of complementary aberrations is achieved, and the aberration effect of the single lens is compensated to the greatest extent.

[0039] In some embodiments, the generatrix of the cylinder is perpendicular to the fast axis direction of the light beam emitted by the semiconductor laser 1 .

[0040] In some embodiments, the optical axis direction of the rotation curved surface coincides with the optical axis direction of the semiconductor laser 1 .

[0041] In some embodiments, the semiconductor laser beam collimation device 10 further includes a fast axis compression lens 12, which is arranged in the beam propagation direction of the semiconductor laser 1 and is used to compress the fast axis direction of the light beam emitted by the semiconductor laser 1. Figure 3As shown, the semiconductor laser 1 includes a light emitting device chip 11. The light beam emitted by the light emitting device 11 first enters a fast axis compression lens 12 for compression, thereby further improving the light utilization rate of the laser collimated light beam.

[0042] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0043] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A semiconductor laser beam collimation device, characterized in that: Used to collimate a light beam emitted by a semiconductor laser, the device comprising: A cylindrical lens and a compound lens, wherein the cylindrical lens and the compound lens are both arranged in the light beam propagation direction of the semiconductor laser.

2. The semiconductor laser beam collimation device according to claim 1, characterized in that: The cylindrical lens is located at the light-emitting side of the semiconductor laser, and the optical axis direction of the cylindrical lens is perpendicular to the fast axis direction of the light beam emitted by the semiconductor laser.

3. The semiconductor laser beam collimation device according to claim 2, characterized in that: The compound lens is located on the light-emitting side of the cylindrical lens, and the optical axis direction of the compound lens coincides with the optical axis direction of the semiconductor laser.

4. The semiconductor laser beam collimation device according to claim 1, characterized in that: The cylindrical lens is located at the light-emitting side of the compound lens, and the optical axis direction of the cylindrical lens is perpendicular to the fast axis direction of the light beam emitted by the semiconductor laser.

5. The semiconductor laser beam collimation device according to claim 4, characterized in that: The compound lens is located at the light-emitting side of the semiconductor laser, and the optical axis direction of the compound lens coincides with the optical axis direction of the semiconductor laser.

6. The semiconductor laser beam collimation device according to any one of claims 1 to 5, characterized in that: The light-entry side of the composite lens is a cylindrical surface, and the light-exit side of the composite lens is a rotational curved surface; Alternatively, the light incident side of the compound lens is a rotational curved surface, and the light exit side of the compound lens is a cylindrical surface.

7. The semiconductor laser beam collimation device according to claim 6, characterized in that: The generatrix of the cylinder is perpendicular to the fast axis direction of the light beam emitted by the semiconductor laser.

8. The semiconductor laser beam collimation device according to claim 6, characterized in that: The optical axis direction of the rotation curved surface coincides with the optical axis direction of the semiconductor laser.

9. The semiconductor laser beam collimation device according to any one of claims 1 to 5, characterized in that: The cylindrical lens is a single cylindrical lens or a double cylindrical lens.

10. The semiconductor laser beam collimation device according to claim 1, characterized in that: The device also includes: A fast axis compression lens is arranged in the propagation direction of the light beam of the semiconductor laser and is used to compress the fast axis direction of the light beam emitted by the semiconductor laser.

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