Vortex laser generating device based on defective lens

Abstract

The utility model discloses a vortex laser generating device based on a defect lens, which comprises a laser resonant cavity, a laser crystal, an etching defect lens and a pump beam optimization assembly used for generating focusing pump laser, the laser resonant cavity comprises an input mirror and an output mirror, and the focusing pump laser pumps the laser crystal after passing through the input mirror; the laser crystal emits high-order mode fluorescence and fundamental mode fluorescence after being pumped, and the high-order mode fluorescence and the fundamental mode fluorescence are amplified into high-order mode laser and fundamental mode laser; the etching defect lens has an adjustable target etching mode order and is used for absorbing the fundamental mode laser and transmitting the high-order mode laser, the high-order mode laser is oscillated for multiple times in the laser resonant cavity until vortex laser of the target order is obtained and then is output through the output mirror, and the target order of the vortex laser is the same as the target etching mode order. According to the invention, effective separation of different orders of laser can be realized, oscillation is selected, and the generation efficiency and purity of the vortex laser of the target order are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of vortex lasers, and particularly relates to a vortex laser generating device based on a defective lens. Background Technique

[0002] Vortex lasers have important application values in the fields of laser communication, super-resolution imaging, etc., and high-efficiency and high-purity vortex lasers are the research basis for related fields. At present, the methods for generating vortex lasers are divided into in-cavity generation methods and out-of-cavity generation methods. Among them, the most common method for generating vortex lasers is mainly the out-of-cavity generation method. However, the purity of the vortex laser obtained by the out-of-cavity method is low, and the conversion efficiency of the vortex laser is low. At present, the in-cavity generation methods proposed in solid-state lasers include the ring optical pumping method [a device for generating high-efficiency mid-infrared vortex lasers, CN219163901U], the etched defect input mirror method [a all-solid-state laser with continuously adjustable vortex light order based on an in-cavity lens, CN117277041A], etc. The ring optical pumping method and the etched defect input mirror method both suppress the oscillation of the fundamental mode laser, but do not distinguish and selectively oscillate the high-order mode lasers. All high-order modes can be excited to oscillate. Therefore, neither of these two methods can obtain high-purity vortex lasers.

[0003] Solid-state lasers have higher laser conversion efficiency and are widely used in the field of high-power lasers. High-purity vortex lasers are of great significance for the development of fields such as laser communication, particle manipulation, and super-resolution imaging. Therefore, it is very important to achieve high-efficiency output of high-purity solid vortex lasers. Summary of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the purpose of the utility model is to provide a vortex laser generating device based on a defective lens, which solves the problems of low generation efficiency and low purity of the vortex laser of the target order in the prior art.

[0005] The present application provides a vortex laser generating device based on a defective lens, which includes a pump beam optimization component, a laser crystal, a laser resonator, and an etched defective lens. The pump beam optimization component is used to generate focused pump laser. The laser resonator includes an input mirror and an output mirror. The input mirror is arranged between the pump beam optimization component and the output mirror. The laser crystal is arranged between the input mirror and the output mirror. The etched defective lens is arranged on a side of the output mirror opposite to the laser crystal. The input mirror is used to transmit the focused pump laser, so that the focused pump laser pumps the laser crystal after passing through the input mirror. After being pumped, the laser crystal emits high-order mode fluorescence and fundamental mode fluorescence, amplifies the high-order mode fluorescence into high-order mode laser, and amplifies the fundamental mode fluorescence into fundamental mode laser. The etched defective lens has an adjustable target etching mode order. The etched defective lens is used to absorb the fundamental mode laser and transmit the high-order mode laser. The high-order mode laser oscillates multiple times in the laser resonator until a vortex laser with a target order is obtained and then is output through the output mirror. Wherein, the target order of the vortex laser is the same as the order corresponding to the target etching mode order of the etched defective lens.

[0006] In some embodiments, the target etching mode order is determined based on the etching position of the etched defective lens, and the etching position is determined relative to the center point of the etched defective lens.

[0007] In some embodiments, the etched defective lens includes an etched portion and a non-etched portion. The etched portion is used to absorb the fundamental mode laser and high-order mode lasers other than the target order. The non-etched portion is used to transmit the high-order mode laser of the target order.

[0008] In some embodiments, the output mirror and the input mirror are arranged parallel and opposite to each other.

[0009] In some embodiments, the pump beam optimization component includes a pump laser, a pump collimating mirror, and a pump focusing mirror. The pump laser is used to emit divergent pump laser. The pump collimating mirror is arranged between the pump laser and the pump focusing mirror. The pump collimating mirror is used to convert the divergent pump laser into collimated pump laser. The pump focusing mirror is arranged between the pump collimating mirror and the input mirror. The pump focusing mirror is used to convert the collimated pump laser into the focused pump laser.

[0010] In some embodiments, the etched defective lens and the output mirror are separated from each other.

[0011] In some embodiments, the etched defective lens is integrated on the output mirror, and the etched defective lens faces the input mirror.

[0012] In some embodiments, both the input mirror and the output mirror are plane mirrors.

[0013] In some embodiments, the input mirror is configured as a plano-concave mirror with a plane first side and a concave second side. The concave side of the input mirror faces the laser crystal, and the first side and the second side are two opposite sides.

[0014] In some embodiments, the input mirror is coated with light-transmitting films and reflective films of different wavelength bands. The transmittance of the light-transmitting film for the focused pump laser is greater than 99%, and the reflectivity of the reflective film for the target laser is greater than 99%.

[0015] The present utility model includes but is not limited to the following beneficial effects: (1) In the present application, the focused pump laser generated by the pump beam optimization component can efficiently pump the laser crystal, improving the energy conversion efficiency. Moreover, through the pumping effect on the laser crystal, the high-order mode fluorescence and the fundamental mode fluorescence can be amplified into high-order mode laser and fundamental mode laser respectively, realizing the effective separation of lasers of different orders and improving the generation efficiency and purity of the vortex laser of the target order; (2) By etching a specific target etching mode order on the etched defect lens, the laser of a specific order passing through can be controlled to ensure that only the vortex laser of the target order is oscillated and output, improving the purity of the output vortex laser of the target order; (3) By adjusting the etching mode order of the etched defect lens, vortex lasers of different orders can be generated, increasing the flexibility of laser applications; (4) The etched part of the etched defect lens can absorb the unwanted high-order mode laser without affecting the lasers of other orders. By absorbing the unwanted high-order mode laser, the purity of the output laser can be improved, and the purity of the vortex laser of the target order can be improved; (5) The parallel arrangement of the input mirror and the output mirror simplifies the design of the laser resonator, making the optical system more intuitive and easier to implement; (6) The integrated setting of the etched defect lens and the output mirror reduces the required physical space, making the entire laser system more compact, simplifies the assembly process, reduces the alignment error, and improves the stability of the system; (7) In the present application, a light-transmitting film is coated on the input mirror, which can achieve a high transmittance of the focused pump laser and reduce the loss of the pump light. Since more pump light is transmitted into the laser crystal, the efficiency of the pumping process can be improved, thereby increasing the generation efficiency of the laser. Further, the transmission film can serve as a protective film for the input mirror, playing a certain protective role for the input mirror; (8) In the present application, the etched defect lens is arranged behind the laser crystal, and the pump laser does not pass through the etched defect lens. Therefore, the etched defect lens does not block the incidence of the pump laser on the laser crystal, improving the utilization efficiency of the pump laser. Description of the Drawings

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art.

[0017] Figure 1 is the distribution diagram of the laser mode;

[0018] Figure 2 is the structural diagram of the visible defect lens of different modes;

[0019] [[ID=II]] Figure 3 is a schematic diagram of a vortex laser generating device based on a defect lens according to an embodiment of the present invention;

[0020] Figure 4 is the distribution diagram of the laser in the laser resonator;

[0021] Figure 5 is another schematic diagram of a vortex laser generating device based on a defect lens according to an embodiment of the present invention;

[0022] Figure 6 is another schematic diagram of a vortex laser generating device based on a defect lens according to an embodiment of the present invention;

[0023] In the figure, 1 - pump laser, 2 - pump collimating mirror, 3 - pump focusing mirror, 4 - input mirror, 5 - laser crystal; 6 - output mirror, 7 - etched defect lens, 8 - vortex laser of the target order. Specific embodiments

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] It can be understood that in the same laser, the high - order mode laser has a larger distribution range and is annularly distributed in intensity, as Figure 1 shown. As the mode order l increases, the distribution range of the laser gradually increases, and the distribution range is proportional to . And because there is an inter - band transfer of electrons in the laser gain medium, that is, the energy at different positions can be transferred within a certain range in the laser crystal, the oscillation of one laser mode will inevitably consume the energy of adjacent modes, thereby suppressing the oscillation of the adjacent - mode laser, that is, there is intense mode competition between different modes. Therefore, in order to obtain a high - purity single - mode vortex laser and improve the conversion efficiency of the vortex laser, it is necessary to make the laser of the target mode oscillate in the laser while suppressing the laser of other modes.

[0026] The present application provides a vortex laser generating device based on a defective lens, which can specifically achieve laser oscillation in a target mode while suppressing lasers in other modes, thereby generating a vortex laser with a higher purity in a target order.

[0027] Specifically, as Figures 3 to 6 shown, the device includes a pump beam optimization component, a laser crystal 5, a laser resonator, and an etched defective lens 7. The pump beam optimization component is used to generate focused pump laser. The laser resonator includes an input mirror 4 and an output mirror 6. The input mirror 4 is arranged between the pump beam optimization component and the output mirror 6. The laser crystal 5 is arranged between the input mirror 4 and the output mirror 6. The etched defective lens 7 is arranged on the side of the output mirror opposite to the laser crystal. The input mirror 4 is used to transmit the focused pump laser, so that the focused pump laser pumps the laser crystal 5 after passing through the input mirror 4. After being pumped, the laser crystal 5 emits high-order mode fluorescence and fundamental mode fluorescence, amplifies the high-order mode fluorescence into high-order mode laser, and amplifies the fundamental mode fluorescence into fundamental mode laser. The etched defective lens 7 has an adjustable target etching mode order. The etched defective lens 7 is used to absorb the fundamental mode laser and transmit the high-order mode laser. The high-order mode laser is oscillated multiple times in the laser resonator until a vortex laser 8 with a target order is obtained and then output through the output mirror 6. Among them, the target order of the vortex laser is the same as the order corresponding to the target etching mode order of the etched defective lens 7.

[0028] It can be understood that the etched defective lens 7 is placed between the laser crystal 5 and the output mirror 6, without blocking the pumping of the laser crystal 5 by the focused pump laser. Therefore, the vortex laser based on the etched defective lens 7 has a higher pumping efficiency. And when the high-order mode laser of a specific order mode is oscillated, since the lasers of adjacent modes cannot oscillate, the energy in the region where this mode is located will be transferred between energy bands to provide energy for the laser oscillation of the target order mode. In the present application, the selection criterion of the defective etched lens for the laser is the order of the laser without selecting the initial phase of the laser. Therefore, the initial phases of the obtained high-order mode lasers are random. The randomly distributed high-order modes can be directly superimposed into a vortex laser without an additional mode converter, etc.

[0029] Specifically, in the above application embodiment, the focused pump laser generated by the pump beam optimization component can efficiently pump the laser crystal 5, improve the energy conversion efficiency, and through the pumping action on the laser crystal 5, the high-order mode fluorescence and the fundamental mode fluorescence can be amplified into high-order mode laser and fundamental mode laser respectively, realizing the effective separation of lasers of different orders and improving the generation efficiency and purity of the vortex laser 8 with a target order.

[0030] Further, the target etching mode order in the embodiments of the present application is determined based on the etching position of the etching defect lens 7, wherein the etching position is determined relative to the center point of the etching defect lens 7. In some embodiments, the etching position may be Figure 2 the positions a, b, and c in. When the etching position is at position a, the target etching mode order is 1, allowing the first-order laser to pass through. When the etching position is at position b, the target etching mode order is 2, allowing the second-order laser to pass through. When the etching position is at position c, the target etching mode order is 3, allowing the third-order laser to pass through. Specifically, when constructing the etching defect lens 7, the adjustment of the target etching mode order can be realized based on different etching positions. By adjusting the target etching mode order, vortex lasers of different orders can be generated, increasing the flexibility of laser applications. Further, by etching the specific target etching mode order on the etching defect lens 7, the order of the passing laser can be controlled to ensure that only the vortex laser 8 of the target order is output, improving the purity of the output vortex laser 8 of the target order.

[0031] In some embodiments, the etching defect lens 7 includes an etched portion and a non-etched portion. The etched portion is used to absorb the fundamental mode and high-order mode lasers other than the target order, and the non-etched portion is used to transmit the high-order mode laser of the target order. Among them, as Figure 2 shown, the etched portion is the bright annular part in the figure. The etched portion of the etching defect lens 7 can absorb the unwanted high-order mode lasers without affecting the lasers of other orders. By absorbing the unwanted high-order mode lasers, the purity of the output laser can be improved, and the purity of the vortex laser 8 of the target order can be improved. By etching different positions, the order of the laser mode can be controlled. Therefore, for lasers of different orders, their distribution positions are different. As the order increases, the laser distribution position gradually spreads out from the center.

[0032] In some embodiments, the output mirror 6 and the input mirror 4 are arranged parallel and opposite to each other. Different band transmissive films and reflective films are coated on the input mirror 4. The transmittance of the transmissive film to the focused pump laser is greater than 99%, and the reflectivity of the reflective film to the target laser is greater than 99%. The parallel arrangement of the input mirror 4 and the output mirror 6 simplifies the design of the laser resonator, making the optical system more intuitive and easier to implement.

[0033] Further, the pump beam optimization component includes a pump laser 1, a pump collimating mirror 2, and a pump focusing mirror 3. The pump laser 1 is used to emit a divergent pump laser. The pump collimating mirror 2 is arranged between the pump laser 1 and the pump focusing mirror 3. The pump collimating mirror 2 is used to convert the divergent pump laser into a collimated pump laser. The pump focusing mirror 3 is arranged between the pump collimating mirror 2 and the input mirror 4. The pump focusing mirror 3 is used to convert the collimated pump laser into a focused pump laser.

[0034] In one embodiment, asFigure 3 As shown, the etched defect lens 7 is separated from the output mirror 6. The etching position is Figure 2 position a shown, and the target mode order of the etched lens is 1.

[0035] In some embodiments, in combination with Figure 3 , the principle of generating the vortex laser 8 of the target order by the vortex laser generating device based on the defect lens is as follows:

[0036] The pump laser 1 generates a dispersed pump laser 1. After the dispersed pump laser 1 is collimated by the pump collimating mirror 2, a collimated pump laser is formed. The collimated pump laser continues to be transmitted to the pump focusing mirror 3 and forms a focused pump laser after being focused by the pump focusing mirror 3. The focused pump laser enters the laser resonator through the input mirror 4. The laser crystal 5 absorbs the focused pump laser and emits high-order mode fluorescence and fundamental mode fluorescence. The high-order mode fluorescence can reach the output with relatively small loss through the etched defect lens 7. Most of the high-order mode fluorescence is reflected and reaches the laser crystal 5 again with relatively small loss through the etched defect lens 7 and is amplified by the laser crystal 5 into high-order mode laser. The high-order mode laser passes through the laser crystal 5 and then reaches the input mirror 4 and is totally reflected by the input mirror 4 and then passes through the laser crystal 5 again and is amplified. The amplified high-order mode laser passes through the etched defect lens 7 again and enters a new cycle. The fundamental mode fluorescence is amplified into fundamental mode laser. Specifically, the distributions of the high-order mode laser and the fundamental mode laser are as Figure 4As shown, the fundamental mode laser is in the middle, and the higher-order mode lasers are on both sides. The higher-order mode lasers and the fundamental mode laser continue to be transmitted to the etched defect lens 7. The dark part of the etched defect lens 7 exhibits absorption characteristics and absorbs the fundamental mode laser, while the bright annular part of the etched defect lens 7 allows the higher-order mode laser after multiple oscillations to pass through and reach the output mirror 6, and is output through the output mirror 6 to obtain the vortex laser 8 of the target order. However, the fundamental mode laser cannot pass through the etched defect lens 7 and is absorbed, and cannot oscillate. Similarly, the higher-order mode lasers with higher orders outside the etched defect lens 7 also cannot oscillate and form a laser. Therefore, only the higher-order mode lasers of specific orders in the resonant cavity can oscillate and be output. It can be understood that the higher-order mode lasers with higher orders in this embodiment refer to the higher-order mode lasers with orders greater than 1, and the higher-order mode lasers of specific orders in this embodiment refer to the higher-order mode lasers with an order of 1. In this embodiment, the focused pump laser generated by the pump beam optimization component can efficiently pump the laser crystal 5, improve the energy conversion efficiency, and through the pumping action on the laser crystal 5, the higher-order mode fluorescence and the fundamental mode fluorescence can be amplified into the higher-order mode laser and the fundamental mode laser respectively, realizing the effective separation of lasers of different orders, improving the generation efficiency and purity of the vortex laser 8 of the target order. Further, by etching the etched defect lens 7 with a specific target etching mode order, the order of the laser passing through can be controlled to ensure that only the vortex laser 8 of the target order is output, improving the purity of the output vortex laser 8 of the target order; further, by adjusting the etching mode order of the etched defect lens 7, vortex lasers of different orders can be generated, increasing the flexibility of laser applications;

[0037] Further, in another embodiment, as Figure 5 shown, the etched defect lens 7 is integrated on the output mirror 6, and the etched defect lens 7 faces the input mirror 4. The etching position is Figure 2 the b position shown, and the target mode order of the etched lens is 2.

[0038] In some embodiments, in combination with Figure 5 , the principle of generating the vortex laser 8 of the target order by the vortex laser generating device based on the defect lens is as follows:

[0039] The pump laser 1 generates a dispersed pump laser 1. After the dispersed pump laser 1 is collimated by the pump collimating mirror 2, a collimated pump laser is formed. The collimated pump laser continues to be transmitted to the pump focusing mirror 3. After being focused by the pump focusing mirror 3, a focused pump laser is formed. The focused pump laser enters the laser resonator through the input mirror 4. The laser crystal 5 absorbs the focused pump laser and emits high-order mode fluorescence and fundamental mode fluorescence. The high-order mode fluorescence can pass through the etched defect lens 7 with relatively small loss and be output. Most of the high-order mode fluorescence is reflected and reaches the laser crystal 5 again with relatively small loss through the etched defect lens 7 and is amplified by the laser crystal 5 into high-order mode laser. The high-order mode laser reaches the input mirror 4 after passing through the laser crystal 5 and is totally reflected by the input mirror 4 and then passes through the laser crystal 5 again and is amplified. The amplified high-order mode laser passes through the etched defect lens 7 again and enters a new cycle. The fundamental mode fluorescence is amplified into fundamental mode laser. Specifically, the distributions of the high-order mode laser and the fundamental mode laser are as Figure 4 shown. The fundamental mode laser is in the middle, and the high-order mode lasers are on both sides. The high-order mode laser and the fundamental mode laser continue to be transmitted to the etched defect lens 7. The dark part of the etched defect lens 7 shows absorption characteristics and absorbs the fundamental mode laser, while the bright annular part of the etched defect lens 7 allows the high-order mode laser after multiple oscillations to pass through and reach the output mirror 6. After being output by the output mirror 6, the vortex laser 8 of the target order is obtained. The fundamental mode laser cannot pass through the etched defect lens 7 and is absorbed and cannot oscillate. Similarly, the higher-order high-order mode lasers outside the etched defect lens 7 also cannot oscillate and form laser. Therefore, only the high-order mode lasers of specific orders in the resonator can oscillate and be output. It can be understood that the higher-order high-order mode lasers in this embodiment refer to the high-order mode lasers higher than the second order, and the high-order mode lasers of specific orders in this embodiment refer to the high-order mode lasers of the second order. It can be understood that, different from the above embodiment, the etched defect lens is integrated on the output mirror 6. Without affecting their respective functions, the integrated design reduces the required physical space, makes the entire laser system more compact, simplifies the assembly process, reduces the alignment error, and improves the stability of the system.

[0040] In some other embodiments, as Figure 6 shown, the etched defect lens 7 and the output mirror 6 are separated from each other. The etching position is at the c position shown in Figure 2 , and the target mode order of the etched lens is 3. Figure 6 The working principle can refer to the introduction of the working principle of the above Figure 3 , which will not be elaborated here.

[0041] In some embodiments, both the input mirror 4 and the output mirror 6 are plane mirrors.

[0042] In some embodiments, the input mirror 4 is configured as a plano-concave mirror with a planar first side and a concave second side. The concave side of the input mirror 4 faces the laser crystal 5, and the first side and the second side are two opposite sides.

[0043] In some embodiments, the input mirror 4 is coated with transmissive films and reflective films of different wavelength bands. The transmittance of the transmissive film to the focused pump laser 1 is greater than 99%, and the reflectivity of the reflective film to the target laser is greater than 99%.

[0044] Furthermore, by coating the transmissive film on the input mirror 4, a high transmittance of the focused pump laser can be achieved, reducing the loss of pump light. Since more pump light is transmitted into the laser crystal 5, the efficiency of the pumping process can be improved, thereby increasing the generation efficiency of the laser. Further, the transmissive film can serve as a protective film for the input mirror 4, providing a certain degree of protection to the input mirror 4.

[0045] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the description in the specification are only used to illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A vortex laser generating device based on a defective lens, characterized in that It includes a pump beam optimization component, a laser crystal (5), a laser resonator, and an etched defect lens (7). The pump beam optimization component is used to generate focused pump laser. The laser resonator includes an input mirror (4) and an output mirror (6). The input mirror (4) is arranged between the pump beam optimization component and the output mirror (6). The laser crystal (5) is arranged between the input mirror (4) and the output mirror (6). The etched defect lens (7) is arranged on the side opposite to the laser crystal (5) with respect to the output mirror (6). The input mirror (4) is used to transmit the focused pump laser so that the focused pump laser pumps the laser crystal (5) after passing through the input mirror (4). After being pumped, the laser crystal (5) emits high-order mode fluorescence and fundamental mode fluorescence, amplifies the high-order mode fluorescence into high-order mode laser, and amplifies the fundamental mode fluorescence into fundamental mode laser. The etched defect lens (7) has an adjustable target etching mode order. The etched defect lens (7) is used to absorb the fundamental mode laser and transmit the high-order mode laser. The high-order mode laser oscillates multiple times in the laser resonator until the vortex laser (8) of the target order is obtained and then is output through the output mirror (6). Among them, the target order of the vortex laser is the same as the order corresponding to the target etching mode order of the etched defect lens (7).

2. The vortex laser generating device based on a defective lens according to claim 1, wherein The target etching mode order is determined based on the etching position of the etched defect lens (no), and the etching position is determined relative to the center point of the etched defect lens (7).

3. The vortex laser generating device based on a defective lens according to claim 1 or 2, characterized in that The etched defect lens (7) includes an etched part and a non-etched part. The etched part is used to absorb the fundamental mode laser and the high-order mode laser other than the target order, and the non-etched part is used to transmit the high-order mode laser of the target order.

4. The vortex laser generating device based on a defective lens according to claim 1, wherein, The output mirror (6) and the input mirror (4) are arranged parallel and opposite to each other.

5. The vortex laser generating device based on a defective lens according to claim 1, wherein The pump beam optimization component includes a pump laser (1), a pump collimating mirror (2), and a pump focusing mirror (3). The pump laser (1) is used to emit divergent pump laser. The pump collimating mirror (2) is arranged between the pump laser (1) and the pump focusing mirror (3). The pump collimating mirror (2) is used to convert the divergent pump laser into collimated pump laser. The pump focusing mirror (3) is arranged between the pump collimating mirror (2) and the input mirror (4). The pump focusing mirror (3) is used to convert the collimated pump laser into the focused pump laser.

6. The vortex laser generating device based on a defective lens according to claim 1, wherein The etched defect lens (7) is separated from the output mirror (6).

7. The vortex laser generating device based on a defective lens according to claim 1, characterized in that, The etched defect lens (7) is integrated on the output mirror (6), and the etched defect lens (7) faces the input mirror (4).

8. The vortex laser generating device based on a defective lens according to claim 5, wherein Both the input mirror (4) and the output mirror (6) are plane mirrors.

9. The vortex laser generating device based on a defective lens according to claim 5, wherein The input mirror (4) is configured as a plano-concave mirror with a plane first side and a concave second side. The concave side of the input mirror (4) faces the laser crystal (5), and the first side and the second side are two opposite sides.

10. The vortex laser generating device based on a defective lens according to claim 1, characterized in that The input mirror (4) is coated with light-transmitting films and reflective films of different wavelength bands. The light-transmitting films have a transmittance of more than 99% for the focused pump laser, and the reflective films have a reflectance of more than 99% for the focused pump laser.

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