Laser with adjustable light field distribution

Abstract

The utility model relates to a laser with adjustable light field distribution. The laser with the adjustable light field distribution comprises a pumping source, a controller, a laser crystal and an output coupling mirror, and the controller is connected with the pumping source and used for controlling the output power and time of the pumping source; the laser crystal is arranged on a pumping laser optical axis output by the pumping source, and the output coupling mirror is also arranged on the pumping laser optical axis and located behind the laser crystal. According to the laser with the adjustable light field distribution, the pumping light with different light spot shapes is output through the pumping source, and the controller is combined to adjust the output power and time of the pumping source, so that laser with different light spot shapes, different power sizes and different output forms, such as continuous laser or pulse laser, can be obtained; the laser with adjustable light field distribution is realized.

Description

Technical Field

[0001] This utility model relates to the field of laser technology, and in particular to a laser with adjustable light field distribution. Background Technology

[0002] Laser technology has wide applications in various fields, with laser medical aesthetics being one of the most popular. In laser medical aesthetics, different laser spot shapes or powers are needed to meet different needs. For example, in laser hair removal, using a rectangular spot ensures no gaps or overlaps between spots when moving compared to a circular spot; in laser vascular treatment, a rectangular spot can better conform to the shape of blood vessels and reduce unnecessary photothermal effects on other tissues.

[0003] In existing technologies, rectangular light spots are mostly generated through beam shapers or beam homogenizers, which shape the laser beam using uniquely designed peripheral devices. Beam shaping systems can fully utilize the design of the focusing system to output a rectangular light spot, allowing for the design of rectangular output spots with the desired aspect ratio. Using beam homogenizers or rectangular waveguides primarily achieves the ideal spot shape by truncating a rectangular region of the light spot. However, both methods inevitably involve energy loss, and the addition of peripheral optical components increases the device size, cost, and assembly complexity. Utility Model Content

[0004] Therefore, the purpose of this invention is to provide a laser with an adjustable light field distribution.

[0005] A laser with tunable optical field distribution includes a pump source, a controller, a laser crystal, and an output coupling mirror. The pump source is used to output pump light with different spot shapes. The controller is connected to the pump source and is used to control the output power and time of the pump source. The laser crystal is disposed on the pump laser optical axis output by the pump source, and the output coupling mirror is disposed on the pump laser optical axis and located behind the laser crystal to couple the laser emitted from the laser crystal to the outside.

[0006] The laser with tunable optical field distribution described in this invention outputs pump light with different spot shapes through a pump source. By combining this with a controller to adjust the output power and timing of the pump source, lasers with different spot shapes, power levels, and output formats, such as continuous lasers or pulsed lasers, can be obtained, thus achieving a laser with tunable optical field distribution. Compared to existing technologies, the laser of this invention has a simple structure, effectively reducing device size, cost, and assembly difficulty. Furthermore, through modular design, different pump sources and laser crystals can be manufactured, allowing for the replacement of appropriate components according to actual needs during use, facilitating operation.

[0007] Furthermore, the pump source is a semiconductor stack, including a heat sink, several heat sinks and several bars. The heat sinks are spaced apart on one side of the heat sink, and the bars are arranged in a one-to-one correspondence between two adjacent heat sinks. Each bar has several laser semiconductors arranged at equal intervals along its length.

[0008] Furthermore, the spacing between the bars is 0.1-0.4 mm.

[0009] Furthermore, the spacing between the laser semiconductors is 100-200 μm.

[0010] Furthermore, the pump source also includes two support plates, which are respectively disposed at both ends of the plurality of heat sinks and abut against the heat sinks.

[0011] Furthermore, the pump source also includes a cylindrical lens array, which includes a plurality of hanging cylindrical lenses, each of which is disposed above the bar and is fixed at both ends to the heat sink.

[0012] Furthermore, the cross-section of the laser crystal is the same as the shape of the beam spot output by the pump source.

[0013] Furthermore, it also includes a focusing lens, which is disposed on the optical axis of the pump light output from the pump source and located in front of the laser crystal.

[0014] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the laser with adjustable light field distribution according to the present invention;

[0016] Figure 2 This is a schematic diagram of the pump source described in the embodiment;

[0017] Figure 3 This is a top view of the pump source described in the embodiment;

[0018] Figure 4 This is a schematic diagram of the pump source cylindrical mirror array described in the embodiment. Detailed Implementation

[0019] Please see Figure 1A laser with tunable optical field distribution includes a pump source 10, a controller 20, a laser crystal 30, and an output coupling mirror 40. The pump source 10 outputs pump laser light, the controller 20 controls the output of the pump source 10, the laser crystal 30 is located on the optical axis of the pump light output from the pump source 10, and the output coupling mirror 40 is also located on the optical axis of the pump light output from the pump source 10 and is positioned behind the laser crystal 30. By adjusting the pump source 10, pump light of different shapes or energies can be obtained, thereby achieving different laser outputs and thus realizing the adjustment of the laser's optical field distribution.

[0020] Please see Figure 2 and 3 The pump source 10 is a semiconductor stack pump, including a heat sink 11, several heat sinks 12, and several bars 13. The heat sink 11 is made of a metal with good thermal conductivity, such as copper or a tungsten-copper alloy, as long as it meets the performance requirements for heat dissipation. Several heat sinks 12 are arranged in an equally spaced array on one side of the heat sink 11. The heat sinks are made of a metal with good thermal conductivity and should have good rigidity, not easily deformed even at millimeter-level thicknesses. In this embodiment, the heat sinks 12 are made of copper. Several bars 13 are arranged one-to-one in the gap between two adjacent heat sinks 12. Each bar 13 has several equally spaced laser semiconductors 14 arranged along its length. The distance between two adjacent bars 13, i.e., the thickness of the heat sink 12, is d1, and the distance between the laser semiconductors 14 on the same bar 13 is d2. Changing d1 and d2 can change the beam spot generated by the pump source 10. For example, setting d1 to 0.4 mm and d2 to 160 μm can make the beam quality rate of the pump source 10 axis symmetrical, resulting in a circular beam spot. Alternatively, setting d1 to 0.2 mm and d2 to 160 μm can produce a rectangular beam spot, etc. It should be noted that since the thickness of the heat sink 12 cannot be reduced to an excessively small value, otherwise there will not be enough rigid support, leading to structural damage, the reasonable range of the spacing d1 between the bars 13 should be 0.1-0.4 mm. Correspondingly, the spacing between the laser semiconductors 14 should be 100-200 μm.

[0021] Preferably, to improve the structural strength of the heat sink 12, the pump source further includes support plates 15. Two support plates 15 are provided, one at each end of one of the heat sinks 12, and abut against the heat sinks 12. The support plates 15 provide support for the heat sinks 12, improving their stability under external interference and preventing displacement or detachment.

[0022] Please see Figure 4 In some embodiments, the pump source 10 further includes a cylindrical lens array 16. The cylindrical lens array 16 includes a plurality of mounted cylindrical lenses, the number of which is equal to the number of the bar array 13. The plurality of mounted cylindrical lenses are arranged in parallel above the heat sink 12, and their positions correspond one-to-one with those of the lower bar array 13. By setting the cylindrical lens array 16 to collimate the laser emitted from the laser semiconductor 14, the brightness of the output laser can be effectively improved, and the pump power density increased.

[0023] The controller 20 is connected to the pump source 10. The controller 20 adjusts the current and voltage input to the pump source 10, thereby controlling the output laser power of the pump source 10. Furthermore, the output time of the pump source 10 is controlled by adjusting the energizing time, thereby achieving continuous laser output or pulsed laser output.

[0024] The laser crystal 30 is disposed on the optical axis of the pump light output from the pump source 10. The cross-section of the laser crystal 30 can be circular, rectangular, or other shapes, matching the pump light spot output from the pump source 10. For example, if the pump source 10 outputs a circular pump light spot, the cross-section of the laser crystal 30 is also set to be circular; if the pump source 10 outputs a rectangular pump light spot, the cross-section of the laser crystal 30 is set to be rectangular.

[0025] The output coupling mirror 40 is disposed on the optical axis of the pump light output from the pump source 10 and located behind the laser crystal 30. The output coupling mirror 40 is used to couple the laser light output from the laser crystal 30 to the outside of the laser.

[0026] In some embodiments, the laser further includes a focusing lens 50. The focusing lens 50 is disposed on the optical axis of the pump light output from the pump source 10 and located in front of the laser crystal 30. The focusing lens 50 is used to focus the pump light so that it coincides with the cross-section of the laser crystal 30, thereby making full use of the energy of the pump light.

[0027] When in use, determine the required laser field distribution according to the usage requirements, select the corresponding pump source 10 and laser crystal 30 for installation, and then adjust the controller 20 to select the appropriate power and output form to obtain the laser with the required spot shape, power and output form.

[0028] The tunable laser field distribution described in this application employs a modular design, allowing for the replacement of pump sources and laser crystals with different configurations to obtain various spot shapes. Furthermore, by controlling the pump source through a controller, different output powers and output modes can be achieved. Compared to existing technologies, the laser of this application offers convenient adjustment of the output laser's optical field distribution, and its simple structure results in minimal laser loss.

[0029] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of this application. The singular forms “a,” “the,” and “the” used in the embodiments and claims of this application are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that, unless otherwise stated, “several” refers to one or more. The terms “above,” “below,” etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for ease of description and simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. The term “and / or” as used herein refers to and includes any or all possible combinations of one or more associated listed items. When the above description relates to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. In the description of this application, those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0030] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and this utility model also intends to include these modifications and variations.

Claims

1. A laser with tunable optical field distribution, characterized in that: The system includes a pump source, a controller, a laser crystal, and an output coupling mirror. The pump source is used to output pump light with different spot shapes. The controller is connected to the pump source and is used to control the output power and time of the pump source. The laser crystal is disposed on the pump laser optical axis output by the pump source, and the output coupling mirror is disposed on the pump laser optical axis and located behind the laser crystal to couple the laser emitted from the laser crystal to the outside.

2. The laser with tunable optical field distribution according to claim 1, characterized in that: The pump source is a semiconductor stack, including a heat sink, several heat sinks and several bars. The heat sinks are spaced apart on one side of the heat sink, and the bars are arranged in a one-to-one correspondence between two adjacent heat sinks. Each bar has several laser semiconductors arranged at equal intervals along its length.

3. The laser with tunable optical field distribution according to claim 2, characterized in that: The spacing between the bars is 0.1-0.4 mm.

4. The laser with tunable optical field distribution according to claim 3, characterized in that: The spacing between the laser semiconductors on each of the bars is 100-200 μm.

5. The laser with tunable optical field distribution according to claim 4, characterized in that: The pump source also includes two support plates, which are respectively disposed at both ends of the plurality of heat sinks and abut against the heat sinks.

6. The laser with tunable optical field distribution according to claim 5, characterized in that: The pump source also includes a cylindrical lens array, which includes several hanging cylindrical lenses, each of which is arranged above the bar and its two ends are fixed to the heat sink.

7. The laser with tunable optical field distribution according to claim 1, characterized in that: The cross-section of the laser crystal is the same as the shape of the beam spot output by the pump source.

8. The laser with tunable optical field distribution according to claim 1, characterized in that: It also includes a focusing lens, which is disposed on the optical axis of the pump light output from the pump source and located in front of the laser crystal.

Images