Optical collimation dodging system for vertical cavity surface emitting laser

Abstract

The utility model relates to an optical collimation dodging system for a vertical cavity surface emitting laser. The optical collimation dodging system comprises a collimating mirror and a diffusion sheet, the collimating lens is a double-spherical-surface lens and is located on the light emitting side of the vertical cavity surface emitting laser and on the path of the laser beam; and the diffusion sheet and the collimating mirror are arranged at an interval and located at the output end of the laser beam. According to the utility model, the whole size is very small, the structure is very simple, the design is ingenious, and the size of a collimation light spot can be controlled to be 3mm * 3mm; pMMA is used as a double-spherical collimating mirror of a low-power system, so that mold opening can be realized, mass production is easier, and the manufacturing process is simple. The VCSEL laser light source can be well suitable for small-power VCSEL laser light sources with various wavelengths, is low in processing cost, can be better applied to household and medical miniaturized handheld products, and can be more easily integrated into the miniaturized handheld products compared with an edge emitting laser.

Description

Technical Field

[0001] This utility model relates to a collimation and homogenization system for optical collimation and homogenization of a vertical cavity surface-emitting laser in a home-use laser medical aesthetic instrument, belonging to the field of optical shaping technology. Background Technology

[0002] In the field of laser medical aesthetics, YAG or edge-emitting semiconductor lasers are mostly used as their light sources. These systems are relatively large and expensive. Home-use medical aesthetics products are mostly handheld, requiring a handheld size. Vertical-cavity surface-emitting lasers (VCSELs), as a new type of surface-emitting laser, have rotational symmetry, more uniform and flat-top characteristics, making them more suitable for large-spot irradiation systems such as those used in physiotherapy.

[0003] For ultra-small novel VCSEL vertical cavity surface-emitting lasers, it is necessary to develop corresponding collimation and homogenization systems to meet the needs of home-use laser medical aesthetics, in order to reduce the system size and meet the irradiation requirements of large light spots. Utility Model Content

[0004] The purpose of this invention is to provide an optical collimation and homogenization system for vertical cavity surface-emitting lasers. It uses PMMA as the dual spherical collimating lens for low-power systems, which makes the overall system small in size and the spot size controllable to 3mm×3mm, making it easier to integrate into miniaturized handheld products.

[0005] To achieve the above-mentioned utility model objectives, this utility model provides an optical collimation and homogenization system for a vertical cavity surface-emitting laser, including a collimating mirror and a diffuser.

[0006] The collimating lens is a double spherical lens located on the output side of the vertical cavity surface-emitting laser, in the path of the laser beam;

[0007] The diffuser, spaced apart from the collimating lens, is located at the output end of the laser beam.

[0008] As a further improvement of this utility model, the diffusion angle of the diffuser sheet is 20° to 80°.

[0009] As a further improvement of this invention, the axis of the collimating lens is parallel to the overall transmission path of the laser beam.

[0010] As a further improvement of this invention, the axis of the collimating lens coincides with the axis of the overall transmission path of the laser beam.

[0011] As a further improvement of this utility model, the area of ​​the light-facing surface of the collimating lens is larger than the area of ​​the light-emitting surface.

[0012] As a further improvement of this utility model, a window is provided on the light-emitting side of the diffuser.

[0013] When the vertical cavity surface-emitting laser (VCSEL) of this invention is used with an optical collimation and homogenization system, the scattered laser beam emitted by the VCSEL first enters the collimating lens and is collimated by the double spherical surface to form a parallel propagating laser beam. Finally, it enters the diffuser, and by adjusting the diffusion angle, the laser beam is further homogenized, making the laser energy distribution on the spot more uniform. Finally, it exits through the window plate, forming a laser spot with a size of up to 3mm×3mm on the target.

[0014] The optical collimation and homogenization system for vertical cavity surface-emitting lasers of this invention allows for convenient and quick adjustment of the collimating lens and diffuser when replacing vertical cavity surface-emitting lasers with different wavelengths and powers, thereby achieving collimation and homogenization. This enables ultra-short-distance collimation and homogenization, resulting in uniform output of high-energy lasers while ensuring a certain degree of eye safety.

[0015] This invention relates to an optical collimation and homogenization system for a vertical-cavity surface-emitting laser. The system is small in size, simple in structure, and ingeniously designed, allowing for control of the collimated spot size down to 3mm × 3mm. Using PMMA as the dual-spherical collimating mirror for low-power systems facilitates easier mold development and mass production, simplifying the manufacturing process. The rotationally symmetric laser source is a better match for the rotationally symmetric spherical mirror.

[0016] The optical collimation and homogenization system for vertical cavity surface-emitting lasers of this invention is well-suited for various wavelengths of low-power VCSEL laser light sources. It has low processing costs and can be better applied to miniaturized handheld products for home and medical use. Compared with edge-emitting lasers, it is easier to integrate into miniaturized handheld products. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the optical principle of this utility model;

[0018] Figure 2 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 3 This is a cross-sectional view of the overall structure of this utility model. Detailed Implementation

[0020] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0021] The purpose of this invention is to provide an optical collimation and homogenization system for a vertical cavity surface-emitting laser (VCSEL). The system uses a PMMA collimating lens 1 to shape the laser beam 6 emitted by the VCSEL 5, thereby achieving the effect of collimation and homogenization.

[0022] PMMA, polymethyl methacrylate, also known as plexiglass or acrylic, is characterized by high transparency, weather resistance, and ease of processing.

[0023] VCSEL, Vertical-Cavity Surface-Emitting Laser, employs a vertical resonant cavity design, with the laser emitted perpendicular to the chip surface; it is also known as a vertical-cavity surface-emitting laser.

[0024] The optical collimation and homogenization system for vertical cavity surface-emitting lasers of this invention has a simple overall structure, such as... Figure 2 , Figure 3 As shown, it includes a collimating lens 1 and a diffuser 2.

[0025] Collimating lens 1, made of PMMA, can be manufactured using a mold. Therefore, it employs a double-spherical design to achieve double-spherical refraction and shaping at both the entrance and exit points, thus achieving a small size and rapid shaping capability. Furthermore, the use of PMMA material, combined with the mold, facilitates easy manufacturing. After being shaped by collimating lens 1, the laser beam 6 propagates as a nearly parallel scattered beam (collimation treatment).

[0026] In the collimating lens 1, the side facing the vertical cavity surface that emits the laser 5 is the light-facing surface, and the other side is the light-emitting surface. The area of ​​the light-facing surface is larger than that of the light-emitting surface, so that the light-facing surface can more easily receive the light from the laser beam 6. The arc diameter of the light-facing sphere and the arc diameter of the light-emitting surface need to be designed according to the actual situation.

[0027] Diffuser 2; A diffuser 2 is also provided in the propagation path of the laser beam 6. The diffusion angle of the diffuser 2 is 20° to 80°. The angle of the diffuser 2 can be adjusted according to the input requirements to uniformly output the laser beam 6.

[0028] Finally, a window 3 is usually installed at the light outlet of the device (handheld laser beauty device) to protect the internal optical components.

[0029] like Figure 1 As shown, the scattered laser beam 6 emitted by the vertical cavity surface emitter 5 first enters the collimating lens 1, where it is collimated by the double spherical surface to form a parallel propagating laser beam 6. Finally, it enters the diffuser 2, where the laser beam 6 is further homogenized by adjusting the diffusion angle, making the laser energy distribution on the spot more uniform. Finally, it exits through the window 3, forming a laser spot with a size of up to 3mm × 3mm on the target 7 (skin or biological tissue).

[0030] The optical collimation and homogenization system for vertical cavity surface-emitting lasers of this invention allows for convenient and quick adjustment of the collimating lens 1 and the diffuser 2 when replacing vertical cavity surface-emitting lasers 5 with different wavelengths and powers, thereby achieving collimation and homogenization. This enables ultra-short-distance collimation and homogenization, resulting in uniform output of high-energy lasers while ensuring a certain degree of eye safety.

[0031] The preferred embodiments of this utility model have been described in detail above, but this utility model is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this utility model, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. An optical collimation and homogenization system for a vertical cavity surface emitting laser, characterized in that, The collimating lens and the diffusion sheet are arranged in sequence. The collimating lens is a double-spherical lens arranged on the light emitting side of the VCL. The diffusion sheet is arranged on the output end of the laser beam.

2. The optical collimation and uniformity system for a vertical cavity surface emitting laser according to claim 1, wherein, The diffusion angle of the diffusion sheet is 20-80 degrees.

3. The optical collimation and uniformity system for a vertical cavity surface emitting laser as claimed in claim 1, wherein, The axis of the collimating lens is parallel to the transmission path of the laser beam.

4. The optical collimation and uniformity system for a vertical cavity surface emitting laser according to claim 1 or 3, wherein The axis of the collimating lens is coincident with the axis of the transmission path of the laser beam.

5. The optical collimation and uniformity system for a vertical cavity surface emitting laser of claim 1, wherein, The area of the light receiving surface of the collimating lens is larger than that of the light emitting surface.

6. The optical collimation and uniformity system for a vertical cavity surface emitting laser of claim 1, wherein, A window sheet is arranged on the light emitting side of the diffusion sheet.

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