Uniform pumping device of semiconductor side pumping laser module and use method of uniform pumping device
By using glass flow guide tubes and light guide plates in the semiconductor side pumping laser module, combined with the metal coating design, the uniformization of the pump beam and the improvement of energy utilization are achieved, and the high intensity of the pump center and the light concentrating chamber are solved. The heating problems caused by light leakage extend the service life of the crystal.
Patent Information
- Application Number
- CN202411246633.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-06
- Publication Date
- 2025-01-14
AI Technical Summary
The existing pumping method of the semiconductor side pumping laser module leads to high pump center intensity and low surrounding intensity, resulting in shortening of the crystal radial thermal gradient and thermal lens focal length, which is easy to damage, and light leakage in the concentration cavity leads to heating problems.
Laser crystals, light guide plates and metal coatings are installed in the glass flow guide tube to limit the light beam to achieve indirect pumping and diffuse reflection, avoiding the pump beam directly illuminating the crystal center, and the design of the glass flow guide tube takes into account the light concentration and flow diversion functions. , improve beam utilization.
The pump beam is uniformized, which avoids high energy in the pump center, improves energy utilization, reduces heat generation and light leakage problems, and extends the service life of the crystal.
Smart Images
Figure CN119315360A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a uniform pumping device of a semiconductor side-pumped laser module and a use method thereof, belonging to the technical field of solid-state lasers. Background Art
[0002] The semiconductor side-pumped laser module is an important device in solid-state lasers. The uniformity of its pumping determines the quality and performance of the output beam. At present, the pumping method of the semiconductor side-pumped laser module is mainly to set a focusing cavity outside the crystal, so that the pumping light is irradiated into the cavity through the reserved window of the focusing cavity. The pumping light irradiates the inner wall of the focusing cavity and irradiates the laser crystal through multiple reflections, and is absorbed by the crystal to pump the laser crystal.
[0003] A common homogenized pumping method is to increase the roughness of the inner wall of the focusing cavity so that the light beam irradiated thereon is diffusely reflected, and the light beam propagates divergently and is homogenized in the cavity. The laser crystal of this method is located at the center of the pumping area, and all pumping lights are directly irradiated onto the crystal. It is inevitable that the intensity in the center of the crystal is high and the intensity around it is low, so that the pumping intensity of the crystal is always high inside and low outside, which aggravates the radial thermal gradient of the crystal, the thermal effect of the module is obvious, the focal length of the thermal lens becomes shorter, and the interior of the crystal is easily damaged. For this reason, the present invention is proposed. Summary of the invention
[0004] In view of the shortcomings of the prior art, the present invention provides a uniform pumping device for a semiconductor side-pumped laser module. The pumping light does not directly irradiate the laser crystal, thereby avoiding the problem of high intensity at the pump center in side pumping. In addition, a focusing cavity is not separately provided, and a glass flow guide tube is used to achieve the functions of focusing and guiding. The leakage energy beam is low and the energy utilization rate is high, thereby avoiding the heating problem caused by light leakage in the focusing cavity in the semiconductor side-pumped laser module.
[0005] The present invention also provides a method for using the uniform pumping device of the semiconductor side-pumped laser module.
[0006] The technical solution of the present invention is as follows:
[0007] A uniform pumping device for a semiconductor side-pumped laser module comprises a laser diode, a laser crystal, a light guide plate and a glass guide tube, wherein the glass guide tube is a hollow cylindrical tube, a laser crystal is arranged in the glass guide tube, one side of the light guide plate is arranged on the outer wall of the glass guide tube, the other side of the light guide plate is a light-incoming surface, a plurality of light guide plates are evenly arranged on the outer wall of the glass guide tube, a laser diode is arranged in a direction corresponding to the light-incoming surface, a frosted surface is arranged on the arc-shaped portion on the outer wall of the glass guide tube, a metal coating is arranged on the frosted surface and the outer side of the light guide plate to limit the leakage of light beams and increase the reflectivity, and the laser diode, the laser crystal and the glass guide tube are all fixed to a packaging shell to achieve overall fixation.
[0008] Preferably, according to the present invention, four light guide plates are provided, and the specific number can be adjusted according to demand.
[0009] Preferably, according to the present invention, the light guide plate is tangent to the outer wall of the glass flow guide tube, and the light guide plate and the glass flow guide tube are integrally formed.
[0010] Preferably according to the present invention, an anti-reflection dielectric film is coated on the light incident surface.
[0011] Preferably according to the present invention, the laser crystal is a Nd:YAG laser crystal.
[0012] The method for using the uniform pumping device of the semiconductor side-pumped laser module comprises the following steps:
[0013] (1) The laser diode emits pump light, which enters the light guide plate through the light inlet surface;
[0014] (2) Since the light guide plate and the frosted surface are coated with metal films, the pump light is confined inside the light guide plate and propagates along the light guide plate toward the frosted surface;
[0015] (3) The pump light is diffusely reflected by the frosted surface onto the laser crystal and absorbed by the laser crystal, achieving uniform pumping.
[0016] The beneficial effects of the present invention are:
[0017] 1. The present invention prevents the light beam emitted by the laser diode from directly irradiating the laser crystal, and the pump light beam is homogenized to avoid high energy in the center of the pump light field.
[0018] 2. The present invention uses a glass guide tube to take into account the functions of both the focusing cavity and the guide, thereby simplifying the structure of the semiconductor side-pumped laser module.
[0019] 3. The present invention limits the pump beam to the light guide plate by coating the outer surface with a metal film, thereby improving the utilization rate of the pump beam and avoiding leakage of the pump light. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a structural schematic diagram of the present invention.
[0021] Figure 2 It is a schematic diagram of the structure of the glass flow guide tube of the present invention.
[0022] Among them: 1-laser diode, 2-glass guide tube, 21-light inlet surface, 22-light guide plate, 23-frosted surface, 3-laser crystal. DETAILED DESCRIPTION
[0023] The present invention will be further described below by way of embodiments in conjunction with the accompanying drawings, but is not limited thereto.
[0024] Embodiment 1:
[0025] like Figure 1-2 As shown, this embodiment provides a uniform pumping device for a semiconductor side-pumped laser module, comprising a laser diode 1, a laser crystal 3, a light guide plate 22 and a glass guide tube 2, wherein the glass guide tube 2 is a hollow cylindrical tube, a laser crystal 3 is arranged in the glass guide tube 2, one side of the light guide plate 22 is arranged on the outer wall of the glass guide tube 2, and the other side of the light guide plate 22 is a light-incoming surface 21, four light guide plates 22 are evenly arranged on the outer wall of the glass guide tube 2, and five laser diodes 1 are arranged in the corresponding direction of each light-incoming surface, and a frosted surface 23 is provided on the arc portion on the outer wall of the glass guide tube 2 (i.e., the outer wall of the glass guide tube after the light guide plate connection position is removed), and the frosted surface 23 is frosted with 100 mesh abrasive, and a metal coating is arranged on the outer side of the frosted surface 23 and the light guide plate 22 to limit the leakage of the light beam and increase the reflectivity, and the laser diode, the laser crystal and the glass guide tube are all fixed to the packaging shell to achieve overall fixation.
[0026] The light guide plate 22 is tangent to the outer wall of the glass guide tube 2 , and the light guide plate 22 and the glass guide tube 2 are integrally formed.
[0027] The output power of the laser diode 1 is 20 W, the wavelength is 808 nm, and the light incident surface 21 is coated with a 808 nm anti-reflection dielectric film.
[0028] The laser crystal 3 is a Nd:YAG laser crystal.
[0029] The method for using the uniform pumping device of the semiconductor side-pumped laser module comprises the following steps:
[0030] (1) The laser diode 1 emits pump light, which enters the light guide plate 22 through the light inlet surface 21;
[0031] (2) Since the light guide plate 22 and the frosted surface 23 are coated with metal films on the outside, the pump light is confined in the light guide plate 22 and propagates along the light guide plate 22 toward the frosted surface 23;
[0032] (3) The pump light is diffusely reflected by the frosted surface 23 onto the laser crystal 3 and absorbed by the laser crystal 3, thereby achieving uniform pumping.
[0033] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.
Claims
1. A uniform pumping device for a semiconductor side-pumped laser module, characterized in that: It includes a laser diode, a laser crystal, a light guide plate and a glass guide tube, wherein the glass guide tube is a hollow cylindrical tube, a laser crystal is arranged in the glass guide tube, one side of the light guide plate is arranged on the outer wall of the glass guide tube, and the other side of the light guide plate is a light input surface, a plurality of light guide plates are evenly arranged on the outer wall of the glass guide tube, a laser diode is arranged in a direction corresponding to the light input surface, a frosted surface is arranged on the arc-shaped part of the outer wall of the glass guide tube, and a metal coating is arranged on the frosted surface and the outer side of the light guide plate.
2. The uniform pumping device of the semiconductor side-pumped laser module according to claim 1, characterized in that: Four light guide plates are provided.
3. The uniform pumping device of the semiconductor side-pumped laser module according to claim 1, characterized in that: The light guide plate is tangent to the outer wall of the glass guide tube, and the light guide plate and the glass guide tube are integrally formed.
4. The uniform pumping device of the semiconductor side-pumped laser module according to claim 1, characterized in that: The light-entering surface is coated with an anti-reflection dielectric film.
5. The uniform pumping device of the semiconductor side-pumped laser module according to claim 1, characterized in that: The laser crystal is Nd:YAG laser crystal.
6. The method for using the uniform pumping device of the semiconductor side-pumped laser module according to claim 3, characterized in that: Here are the steps: (1) The laser diode emits pump light, which enters the light guide plate through the light inlet surface; (2) Since the light guide plate and the frosted surface are coated with metal films, the pump light is confined inside the light guide plate and propagates along the light guide plate toward the frosted surface; (3) The pump light is diffusely reflected by the frosted surface onto the laser crystal and absorbed by the laser crystal, achieving uniform pumping.