Visible light laser

Abstract

The embodiments of the present disclosure disclose a visible light band laser. A specific implementation of the method includes: an integrated laser gain reflector, an excitation beam control optical element, a polarization control optical element, and a frequency conversion optical element are all seamlessly integrated on an optical integrated substrate, and the fundamental frequency infrared laser layer in the integrated laser gain reflector is composed of each pair of excitation light energy absorption layers and fundamental frequency infrared laser emission layers; the excitation beam control optical element includes an excitation beam control optical element reflection surface one and an excitation beam control optical element reflection surface two; the frequency conversion optical element includes a frequency conversion optical element reflection surface two. This implementation can reduce the difficulty of obtaining visible light band lasers, improve the wavelength diversity and band diversity of the generated visible light, improve the portability and maneuverability of the laser, and improve the stability of obtaining visible light band lasers.

Description

Technical Field

[0001] The embodiments of the present disclosure relate to the field of laser technology, and in particular to a visible light band laser. Background Art

[0002] Lasers in the visible light band with a wavelength in the range of 380nm-780nm can be perceived by the human eye. In addition to being widely used in traditional fields such as laser display and laser lighting, lasers in the visible light band also have good application prospects in many life science fields and laser spectroscopy. At present, when obtaining visible light laser beams, the commonly used method is to obtain visible light laser beams from liquid or gas gain media, such as through liquid dye lasers, gas lasers, through the generation of visible light laser beams in semiconductor gain media, or through nonlinear frequency conversion methods such as frequency doubling or parametric oscillation from solid lasers to obtain limited visible light laser beams.

[0003] However, it is found in practice that when the above method is used to obtain a visible light laser beam, the following technical problems often occur:

[0004] When obtaining a visible light laser beam through a liquid method, the efficiency of obtaining a visible light laser beam is low and the dye is often toxic, making it difficult to store or maintain the dye, resulting in greater difficulty in obtaining a visible light laser beam; when obtaining a visible light laser beam through a gas laser, the stability of the gas laser is poor, resulting in poor stability of the obtained visible light laser beam; the wavelength obtained through a solid laser is relatively single, and the structure of the solid laser is relatively complex, resulting in poor portability and maneuverability; when obtaining a visible light laser beam through a semiconductor method, the generated wavelength band is relatively single and the quality of the generated visible light laser beam is poor.

[0005] The above information disclosed in this Background section is only for enhancement of understanding of the background of the present disclosure concept and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art. Summary of the invention

[0006] The content of this disclosure is used to introduce concepts in a brief form, which will be described in detail in the detailed implementation section below. The content of this disclosure is not intended to identify the key features or essential features of the technical solution claimed for protection, nor is it intended to limit the scope of the technical solution claimed for protection.

[0007] Some embodiments of the present disclosure propose visible light band lasers to solve one or more of the technical problems mentioned in the above background technology section.

[0008] In a first aspect, some embodiments of the present disclosure provide a visible light band laser, characterized in that the visible light band laser comprises an optical integrated substrate and a laser resonant cavity, wherein the optical integrated substrate is integrated with an integrated laser gain reflector, an excitation beam control optical element, a polarization control optical element and a frequency conversion optical element, wherein the integrated laser gain reflector, the excitation beam control optical element, the polarization control optical element and the frequency conversion optical element are all seamlessly integrated on the optical integrated substrate, the optical integrated substrate is a thin plate, the fundamental frequency infrared laser layer in the integrated laser gain reflector is composed of each pair of excitation light energy absorption layer and the fundamental frequency infrared laser emission layer, and the material composition of each excitation light energy absorption layer and the material composition of each fundamental frequency infrared laser emission layer in the fundamental frequency infrared laser layer can be adjusted; the excitation beam control optical element comprises an excitation beam control optical element reflection surface one and an excitation beam control optical element reflection surface two, and the frequency conversion optical element The conversion optical element comprises a second reflection surface of the frequency conversion optical element; the laser resonant cavity is composed of an integrated broadband reflection mirror at the rear end of the integrated laser gain reflection mirror and the second reflection surface of the frequency conversion optical element; in a working state, the excitation light beam is controlled by the excitation light beam control optical element, and after being totally reflected by the first reflection surface of the excitation light beam control optical element and the second reflection surface of the excitation light beam control optical element, the excitation light beam is projected onto the surface of the integrated laser gain reflection mirror and refracted into the inside of the integrated laser gain reflection mirror, so as to be absorbed by the excitation light energy absorption layer inside the integrated laser gain reflection mirror to obtain photogenerated carriers, the photogenerated carriers emitted from the inside of the integrated laser gain reflection mirror are stimulated to radiate and transition in the laser resonant cavity to form laser oscillation, and generate a fundamental frequency infrared laser beam, which is converted into a linearly polarized light after passing through the polarization control optical element, and after the linearly polarized light enters the frequency conversion optical element, the frequency conversion optical element outputs a visible light laser beam.

[0009] Optionally, it is characterized in that the above-mentioned integrated laser gain reflector includes an integrated laser gain reflector substrate, an integrated broadband reflector, a fundamental frequency infrared laser layer, a photogenerated carrier confinement layer, and an integrated laser gain reflector protective layer.

[0010] Optionally, it is characterized in that the shape of the excitation beam control optical element is a triangular or polygonal element, and the excitation beam control optical element is made of transparent material.

[0011] Optionally, it is characterized in that the above-mentioned polarization control optical element is in the shape of a polygonal element, the above-mentioned polarization control optical element is a transparent material, the above-mentioned transparent material is transparent to the excitation light wavelength and the near-infrared wavelength, the above-mentioned polarization control optical element includes a polarization control optical element reflection surface one and a polarization control optical element reflection surface two, the above-mentioned polarization control optical element reflection surface one is coated with a film layer that is transparent to the above-mentioned fundamental frequency infrared laser beam, and the above-mentioned fundamental frequency infrared laser beam is converted into linear polarized light after passing through the above-mentioned polarization control optical element reflection surface two.

[0012] Optionally, it is characterized in that the above-mentioned frequency conversion optical element also includes a reflection surface one of the frequency conversion optical element, and the reflection surface one of the frequency conversion optical element is coated with a film layer that is transparent to the above-mentioned fundamental frequency infrared laser beam. The angle of the reflection surface two of the frequency conversion optical element makes the above-mentioned fundamental frequency infrared laser beam normally incident thereon, and the reflection surface two of the frequency conversion optical element is coated with a film layer that can reflect the above-mentioned fundamental frequency infrared laser beam, and is coated with a film layer that is transparent to the laser wavelength of the visible light laser beam.

[0013] Optionally, it is characterized in that one end of the polarization control optical element is connected to the frequency conversion optical element, and the other end of the polarization control optical element is connected to the excitation beam control optical element.

[0014] Optionally, the excitation light beam is a parallel laser light beam.

[0015] Optionally, the frequency conversion optical element is a critical phase-matched or non-critical phase-matched nonlinear crystal, and the nonlinear crystal is transparent to the fundamental frequency infrared laser beam emitted by the integrated laser gain reflector and its corresponding visible light wavelength.

[0016] Optionally, the excitation beam control optical element is seamlessly connected to the integrated laser gain reflector, one end of the polarization control optical element is seamlessly connected to the frequency conversion optical element, the other end of the polarization control optical element is seamlessly connected to the excitation beam control optical element, the potential barrier of the excitation light energy absorption layer material in each pair of excitation light energy absorption layers and the fundamental frequency infrared laser emission layer in the fundamental frequency infrared laser layer is greater than the potential barrier of the fundamental frequency infrared laser emission layer material, and the thickness of the excitation light energy absorption layer is greater than the above The thickness of the fundamental frequency infrared laser emission layer, the total optical thickness of the excitation light energy absorption layer and the fundamental frequency infrared laser emission layer is half the laser wavelength, the center position of the fundamental frequency infrared laser emission layer is located at the peak of the laser standing wave field in the integrated laser gain reflector, the excitation beam control optical element reflection surface 1 and the excitation beam control optical element reflection surface 2 in the excitation beam control optical element can both cause the excitation beam to be totally reflected thereon, and the integrated broadband reflector in the integrated laser gain reflector is composed of a plurality of pairs of high refractive index material layers and low refractive index material layers with an optical thickness of one quarter of the laser wavelength.

[0017] Optionally, the above-mentioned visible light band laser is inspected through the following operation steps: taking an image of the above-mentioned visible light band laser; uploading the taken image to a gap detection processor, and the above-mentioned gap detection processor is configured to perform the following steps: graying and normalizing the received image to obtain the graying and normalized image as the target image; performing target detection processing on the above-mentioned target image to obtain target position information corresponding to the above-mentioned target image; performing threshold segmentation processing on the above-mentioned target image information to obtain each binary image information; based on the above-mentioned each binary image information, generating noise point quantity information and noise point position information corresponding to each binary image information in the above-mentioned each binary image information; based on the above-mentioned each noise point quantity information and the above-mentioned each noise point position information, deleting each noise point included in the binary image information that meets the preset deletion condition in the above-mentioned each binary image information to obtain each updated binary image information; resetting the intensity value of each pixel point in each updated binary image information to obtain a denoised image; based on the denoised image, generating gap detection information corresponding to the above-mentioned visible light band laser.

[0018] In a second aspect, some embodiments of the present disclosure provide an electronic device, comprising: one or more processors; a storage device on which one or more programs are stored, and when the one or more programs are executed by the one or more processors, the one or more processors implement the method described in any implementation method in the above-mentioned first aspect.

[0019] In a third aspect, some embodiments of the present disclosure provide a computer-readable medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the method described in any one of the implementations in the first aspect.

[0020] The above-mentioned embodiments of the present disclosure have the following beneficial effects: through the visible light band laser of some embodiments of the present disclosure, the difficulty of obtaining visible light band laser is reduced, the wavelength diversity and band diversity of the generated visible light are improved, the portability and maneuverability of the laser are improved, and the stability of obtaining visible light band laser is improved. Specifically, the difficulty of obtaining visible light band laser is relatively large, the wavelength and band of the generated visible light are relatively single, the portability and maneuverability of the laser are relatively poor, and the stability of obtaining visible light band laser is relatively poor. The reasons are: when obtaining visible light laser beam by liquid method, the efficiency of obtaining visible light laser beam is low and there are many cases of toxic dyes, which makes it difficult to store or maintain dyes, resulting in greater difficulty in obtaining visible light laser beams; when obtaining visible light laser beams by gas lasers, the stability of gas lasers is poor, resulting in poor stability of the obtained visible light laser beams; the wavelength obtained by solid lasers is relatively single, and the structure of solid lasers is relatively complex, resulting in poor portability and maneuverability; when obtaining visible light laser beams by semiconductor method, the generated band is relatively single and the quality of the generated visible light laser beams is poor. Based on this, the visible light band laser of some embodiments of the present disclosure includes an optical integrated substrate and a laser resonant cavity. Among them, the optical integrated substrate is integrated with an integrated laser gain reflector, an excitation beam control optical element, a polarization control optical element, and a frequency conversion optical element. Among them, the integrated laser gain reflector, the excitation beam control optical element, the polarization control optical element, and the frequency conversion optical element are all seamlessly integrated on the optical integrated substrate. The optical integrated substrate is a thin plate. The fundamental frequency infrared laser layer in the integrated laser gain reflector is composed of each pair of excitation light energy absorption layers and fundamental frequency infrared laser emission layers. The material composition of each excitation light energy absorption layer in the fundamental frequency infrared laser layer and the material composition of each fundamental frequency infrared laser emission layer can be adjusted. The excitation beam control optical element includes an excitation beam control optical element reflection surface 1 and an excitation beam control optical element reflection surface 2. The frequency conversion optical element includes a frequency conversion optical element reflection surface 2. The laser resonant cavity is composed of an integrated broadband reflector at the rear end of the integrated laser gain reflector and a frequency conversion optical element reflection surface 2.In the working state, the excitation light beam is controlled by the excitation light beam control optical element, and after being totally reflected by the reflection surface 1 and the reflection surface 2 of the excitation light beam control optical element, it is projected onto the surface of the integrated laser gain reflector and refracted into the interior of the integrated laser gain reflector, so as to be absorbed by the excitation light energy absorption layer inside the integrated laser gain reflector to obtain photogenerated carriers. The photogenerated carriers emitted inside the integrated laser gain reflector undergo stimulated radiation transition in the laser resonant cavity and form laser oscillation to generate a fundamental frequency infrared laser beam. The generated fundamental frequency infrared laser beam is converted into linearly polarized light after passing through the polarization control optical element. After the linearly polarized light enters the frequency conversion optical element, the frequency conversion optical element outputs a visible light laser beam. Also, because the laser wavelength emitting material in the laser gain reflector in the above-mentioned visible light band laser is a semiconductor material, and the material composition of each excitation light energy absorption layer in the above-mentioned fundamental frequency infrared laser layer and the material composition of each fundamental frequency infrared laser emitting layer in the above-mentioned visible light band laser can be adjusted, the emission wavelength of the above-mentioned visible light band laser covers a wide range, and after frequency conversion, the obtained visible light laser wavelength almost covers the entire visible light wavelength range, thereby improving the diversity of wavelengths and bands. Also, because the above-mentioned integrated laser gain reflector, excitation beam, excitation beam control optical element, polarization control optical element, and frequency conversion optical element are seamlessly integrated into the above-mentioned optical integrated substrate, the size of the laser is reduced, and the weight of the laser is reduced, thereby further improving the stability and reliability of the laser, and the above-mentioned integrated laser gain reflector, excitation beam, excitation beam control optical element, polarization control optical element, and frequency conversion optical element are integrated into an optical integrated substrate, so that the visible light laser beam can be obtained only through the optical integrated substrate, and the modularization of the laser is realized, thereby improving the portability and mobility of the laser. In addition, because the optical integrated substrate has the function of dissipating heat for optical components, the stability of the output visible light laser beam can be improved. As a result, the difficulty of obtaining visible light band lasers can be reduced, the wavelength diversity and band diversity of the generated visible light can be improved, the portability and maneuverability of the laser can be improved, and the stability of obtaining visible light band lasers can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. Throughout the accompanying drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and that components and elements are not necessarily drawn to scale.

[0022] Figure 1 is a top view of a visible light band laser according to the present disclosure;

[0023] Figure 2 is a structural diagram of a laser gain reflector according to the present disclosure;

[0024] Figure 3 is the test data of the wavelength and light intensity of the fundamental frequency infrared laser beam according to the present disclosure;

[0025] Figure 4 is the test data of the wavelength and light intensity of the visible light laser beam according to the present disclosure;

[0026] Figure 5 It is a schematic diagram of the structure of an electronic device suitable for implementing some embodiments of the present disclosure. DETAILED DESCRIPTION

[0027] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not intended to limit the scope of protection of the present disclosure.

[0028] It should also be noted that, for ease of description, only the parts related to the invention are shown in the drawings. In the absence of conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other.

[0029] It should be noted that the concepts such as "first" and "second" mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0030] It should be noted that the modifications of "one" and "plurality" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0031] The names of the messages or information exchanged between multiple devices in the embodiments of the present disclosure are only used for illustrative purposes and are not used to limit the scope of these messages or information.

[0032] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0033] Figure 1 A top view of a visible band laser according to the present disclosure is shown. Figure 1It includes an optical integrated substrate 1 and a laser resonant cavity. The optical integrated substrate 1 is integrated with an integrated laser gain reflector 2, an excitation beam control optical element 4, a polarization control optical element 5, and a frequency conversion optical element 6. The laser resonant cavity is composed of an integrated broadband reflector 16 at the rear end of the integrated laser gain reflector 2 and a frequency conversion optical element reflection surface 2 14 of the frequency conversion optical element 6. The excitation beam control optical element 4 includes an excitation beam control optical element reflection surface 1 9 and an excitation beam control optical element reflection surface 2 10. The polarization control optical element 5 includes a polarization control optical element reflection surface 1 11 and a polarization control optical element reflection surface 2 12. The frequency conversion optical element 6 includes a frequency conversion optical element reflection surface 1 13 and a frequency conversion optical element reflection surface 2 14.

[0034] In some embodiments, the visible light band laser may include an optical integrated substrate 1 and a laser resonant cavity. The optical integrated substrate 1 may be made of a thin plate having a high thermal conductivity, a low thermal expansion coefficient and a high strength. The optical integrated substrate 1 may be used to carry various optical elements and to dissipate heat for various optical elements. Here, the specific material type and size (length, width and height) of the optical integrated substrate 1 are not specifically limited and may be adjusted as needed. For example, the optical integrated substrate 1 may be an aluminum nitride plate having a length of 68 mm, a width of 32 mm and a thickness of 5 mm. In the working state, the waste heat generated by the visible light band laser during operation is conducted to the housing of the visible light band laser or other heat dissipation device through the optical integrated substrate 1, and the heat is finally dissipated, so that the working temperature of the visible light band laser can be maintained stable, thereby improving the stability of the visible light band laser. It should be noted that the fixing method of the integrated laser gain reflector 2, the excitation beam control optical element 4, the polarization control optical element 5 and the frequency conversion optical element 6 fixed to the optical integrated substrate 1 is not limited. For example, the integrated laser gain reflector 2, the excitation beam control optical element 4, the polarization control optical element 5 and the frequency conversion optical element 6 may be fixed to the optical integrated substrate 1 by means of screw holes, slots, welding, gluing and the like.

[0035] In some embodiments, the optical integrated substrate 1 may be integrated with an integrated laser gain reflector 2, an excitation beam control optical element 4, a polarization control optical element 5, and a frequency conversion optical element 6. The integrated laser gain reflector 2, the excitation beam control optical element 4, the polarization control optical element 5, and the frequency conversion optical element 6 may be seamlessly integrated on the optical integrated substrate 1. The optical integrated substrate 1 may be a thin plate. The fundamental frequency infrared laser layer 17 in the integrated laser gain reflector 2 may be composed of pairs of excitation light energy absorption layers 22 and fundamental frequency infrared laser emission layers 23. The material composition of each excitation light energy absorption layer 22 and the material composition of each fundamental frequency infrared laser emission layer 23 in the fundamental frequency infrared laser layer 17 may be adjustable. The fundamental frequency infrared laser layer 17 may include 12 pairs of high barrier materials and low barrier materials. The material of the excitation light energy absorption layer 22 of the high barrier material included in the fundamental frequency infrared laser layer 17 may be GaAs. The material of the fundamental frequency infrared laser emitting layer 23 of the low barrier material included in the fundamental frequency infrared laser layer 17 may be indium (In) doped gallium arsenide (GaAs) material, that is, (In 0.09 GaAs). The thickness of the fundamental frequency infrared laser emitting layer 23 of the low barrier material may be 8 nm. The thickness of the excitation light energy absorption layer 22 of the high barrier material may be 131 nm. By adjusting the material composition of each excitation light energy absorption layer 22 and the material composition of each fundamental frequency infrared laser emitting layer 23 in the fundamental frequency infrared laser layer 17, different visible light wavelengths can be obtained, thereby improving the wavelength diversity and band diversity of the generated visible light.

[0036] In some embodiments, the excitation beam control optical element 4 may include an excitation beam control optical element reflection surface 1 9 and an excitation beam control optical element reflection surface 2 10. The frequency conversion optical element 6 may include a frequency conversion optical element reflection surface 2 14. The excitation beam control optical element reflection surface 1 9 and the excitation beam control optical element reflection surface 2 10 in the excitation beam control optical element 4 may both cause the excitation beam to be totally reflected thereon. The excitation beam control optical element 4 may project the excitation beam after being totally reflected internally onto the surface of the integrated laser gain reflector 2.

[0037] In some embodiments, the laser resonant cavity can be composed of an integrated broadband reflector 16 at the rear end of the integrated laser gain reflector 2 and the second reflective surface 14 of the frequency conversion optical element. The second reflective surface 14 of the frequency conversion optical element has a high reflectivity characteristic for the fundamental infrared laser wavelength. The high reflectivity characteristic of the second reflective surface 14 of the frequency conversion optical element can make the excitation energy density in the laser resonant cavity high, thereby increasing the efficiency of nonlinear frequency conversion of the visible light band laser. And because each optical element is seamlessly integrated on the optical integrated substrate, the laser resonant cavity thus formed has the characteristics of compactness and miniaturization and stability, thereby further improving the stability of the visible light band laser in the working state. In the working state, the excitation light beam is controlled by the excitation light beam, and after being totally reflected by the reflection surface 1 9 and the reflection surface 2 10 of the excitation light beam control optical element, it is projected onto the surface of the integrated laser gain reflector 2 and refracted into the inside of the integrated laser gain reflector 2, so as to be absorbed by the excitation light energy absorption layer 22 inside the integrated laser gain reflector 2, thereby obtaining photogenerated carriers. The photogenerated carriers emitted from the inside of the integrated laser gain reflector 2 undergo stimulated radiation transition in the laser resonant cavity and form laser oscillation, thereby generating a fundamental frequency infrared laser beam. The generated fundamental frequency infrared laser beam is converted into linearly polarized light after passing through the polarization control optical element 5. After the linearly polarized light enters the frequency conversion optical element 6, the frequency conversion optical element 6 outputs a visible light laser beam. The excitation light beam may be a collimated semiconductor laser beam with a wavelength of 808 nm. The excitation light beam may be emitted by a laser. The diameter of the excitation light beam is not specifically limited here. For example, the diameter of the excitation light beam 3 may be 200 μm. The reason for selecting a semiconductor laser beam with a wavelength of 808nm is that the absorption peak of the integrated laser gain reflector 2 is around 808nm. The wavelength of the excitation light beam 3 is smaller than the wavelength of the fundamental frequency infrared laser beam emitted by the integrated laser gain reflector 2. The wavelength of the fundamental frequency infrared laser beam emitted by the integrated laser gain reflector 2 can be 960nm. Therefore, the energy of the excitation light beam 3 can be absorbed by the excitation light energy absorption layer 22 inside the integrated laser gain reflector 2. Figure 3 As shown, Figure 3 Shown may be test data of the wavelength and light intensity of the fundamental frequency infrared laser beam.

[0038] Alternatively, if Figure 1 or Figure 2As shown, the integrated laser gain reflector 2 may include an integrated laser gain reflector substrate 15, an integrated broadband reflector 16, a fundamental frequency infrared laser layer 17, a photogenerated carrier confinement layer 18, and an integrated laser gain reflector protective layer 19. The material of the integrated laser gain reflector substrate 15 may be lattice matched with the other layers of materials in the integrated laser gain reflector 2. The integrated laser gain reflector substrate 15 may be an undoped gallium arsenide (GaAs) substrate. In the working state, the fundamental frequency infrared laser layer 17 in the integrated laser gain reflector 2 may absorb the energy of the excitation light beam 3 and emit a fundamental frequency infrared laser beam with a peak wavelength of 960 nm. The material of the integrated laser gain reflector protective layer 19 may be an anti-oxidation material. The integrated laser gain reflector protective layer 19 may be a GaAs layer with a thickness of 10 nm. The material of the photogenerated carrier confinement layer 18 may be an Al2O3 layer with a thickness of 363 nm. 0.6 GaAs material. The specific numerical value setting of the thickness of the integrated laser gain reflector protection layer 19 and the photogenerated carrier confinement layer 18 can make the emission wavelength be in the center of the spectrum.

[0039] Alternatively, if Figure 1 As shown, the shape of the excitation beam control optical element 4 can be a triangular or polygonal element. The excitation beam control optical element 4 can be made of a transparent material. Among them, the material of the excitation beam control optical element 4 can be glass, quartz or other materials that are transparent to the excitation light wavelength and the near-infrared wavelength. For example, the material of the excitation beam control optical element 4 can be K9 glass material. The cross-section of the excitation beam control optical element 4 can be a flat plate in the shape of an equilateral right triangle. The reason for setting the cross-section of the laser beam control optical element to an equilateral right triangle is that the excitation beam 3 needs to be rotated 180°. The thickness of the excitation beam control optical element 4 can be 5mm. In the working state, the excitation beam 3 is totally reflected on the reflection surface 1 9 and the reflection surface 2 10 of the excitation beam control optical element, and then projected onto the surface of the integrated laser gain reflector 2 in the form of normal incidence.

[0040] Alternatively, if Figure 1As shown, the shape of the polarization control optical element 5 can be a polygonal element. The polarization control optical element 5 can be a transparent material. The transparent material can be transparent to the excitation light wavelength and the near-infrared wavelength. The polarization control optical element 5 can include a polarization control optical element reflection surface 11 and a polarization control optical element reflection surface 2 12. The polarization control optical element reflection surface 1 11 can be coated with a film layer that the fundamental frequency infrared laser beam can pass through. The fundamental frequency infrared laser beam is converted into linear polarized light after passing through the polarization control optical element reflection surface 2 12. In the working state, the fundamental frequency infrared laser beam emitted from the integrated laser gain reflector 2 is converted into linear polarized light after passing through the polarization control optical element 5. The specific material of the polarization control optical element 5 is not limited here. The material of the polarization control optical element 5 can be glass or quartz. For example, the material of the polarization control optical element 5 can be K9 glass material. The cross section of the polarization control optical element 5 can be a trapezoidal quadrilateral flat plate. The thickness of the polarization control optical element 5 can be 5mm. The cutting method of the second polarization control optical element reflection surface 12 in the polarization control optical element 5 and the cross section of the polarization control optical element 5 being a trapezoidal quadrilateral flat plate can make the incident angle of the fundamental frequency infrared laser beam incident on the second polarization control optical element reflection surface 12 be the Brewster angle of 960nm wavelength, so that the fundamental frequency infrared laser beam becomes linearly polarized light after passing through the polarization control optical element 5. Here, the specific value of the transmittance of the film layer coated on the first polarization control optical element reflection surface 11 is not limited, and the transmittance of the film layer coated on the first polarization control optical element reflection surface 11 can be greater than 95%.

[0041] Alternatively, if Figure 1As shown, the frequency conversion optical element 6 may include a frequency conversion optical element reflective surface 13 and a frequency conversion optical element reflective surface 2 14. The frequency conversion optical element reflective surface 13 may be coated with a film layer that is transparent to the fundamental frequency infrared laser beam. The angle of the frequency conversion optical element reflective surface 2 14 may allow the fundamental frequency infrared laser beam to be normally incident thereon. The frequency conversion optical element reflective surface 2 14 may be coated with a film layer that is reflective to the fundamental frequency infrared laser beam, and may be coated with a film layer that is transparent to the laser wavelength of the visible light laser beam. In this regard, the specific value of the transmittance of the film layer coated on the frequency conversion optical element reflective surface 13 is not limited. The transmittance of the film layer coated on the frequency conversion optical element reflective surface 13 to the fundamental frequency infrared laser beam with a wavelength of 960nm may be greater than 95%. The cutting of the frequency conversion optical element reflective surface 13 may enable a seamless connection between the frequency conversion optical element reflective surface 13 and the polarization control optical element reflective surface 2 12. The cutting of the second reflective surface 14 of the frequency conversion optical element can make the fundamental frequency infrared laser beam be normally incident on the second reflective surface 14 of the frequency conversion optical element. The second reflective surface 14 of the frequency conversion optical element can be coated with a film layer with high reflectivity to the 960nm wavelength of the fundamental frequency infrared laser beam, and a film layer with high transmittance to the 480nm wavelength of the visible light laser beam 8. The reflectivity of the film layer coated on the second reflective surface 14 of the frequency conversion optical element to the fundamental frequency infrared laser beam can be greater than 99.2%, and the transmittance of the film layer coated on the second reflective surface 14 of the frequency conversion optical element to the 480nm wavelength of the visible light laser beam 8 can be greater than 95%. It should be noted that coating with a reflective film layer and a transparent film layer can make the visible light laser beam after the fundamental frequency infrared laser beam is frequency converted be output through the second reflective surface 14 of the frequency conversion optical element. In the working state, the fundamental frequency infrared laser beam with a wavelength of 960nm undergoes frequency conversion after passing through the frequency conversion optical element 6, and becomes a visible light laser beam with a wavelength of 480nm, and is output through the reflection surface 14 of the frequency conversion optical element. Figure 4 As shown, Figure 4 The test data of the wavelength and light intensity of the output visible light laser beam are shown. It should be noted that the cutting method of the above polarization control optical element and the above frequency conversion optical element can be: first, the corresponding angle is calculated according to the wavelength of the fundamental frequency infrared beam, so that the optical axis angle of the incident angle material corresponds to the wavelength band of the fundamental frequency infrared laser beam. Then, the cutting is performed using crystal cutting technology.

[0042] Alternatively, if Figure 1As shown, one end of the polarization control optical element 5 can be connected to the frequency conversion optical element 6. The other end of the polarization control optical element 5 can be connected to the excitation beam 3 and the excitation beam control optical element 4.

[0043] Alternatively, if Figure 1 As shown, the excitation light beam 3 can be a parallel laser light beam.

[0044] Alternatively, if Figure 1 As shown, the frequency conversion optical element 6 can be a nonlinear crystal with critical phase matching or non-critical phase matching. The nonlinear crystal can be transparent to the fundamental frequency infrared laser beam emitted by the integrated laser gain reflector 2 and its corresponding visible light wavelength. The specific material of the frequency conversion optical element 6 is not limited here. For example, the nonlinear crystal can be a type I critical phase matching LBO crystal.

[0045] Alternatively, if Figure 1 or Figure 2As shown, the excitation beam control optical element 4 and the integrated laser gain reflector 2 can be seamlessly connected. One end of the polarization control optical element 5 and the frequency conversion optical element 6 can be seamlessly connected. The other end of the polarization control optical element 5 and the excitation beam control optical element 4 can be seamlessly connected. The potential barrier of the excitation light energy absorption layer 22 material in each pair of excitation light energy absorption layer 22 and fundamental frequency infrared laser emission layer 23 in the fundamental frequency infrared laser layer 17 can be greater than the potential barrier of the fundamental frequency infrared laser emission layer 23 material, and the thickness of the excitation light energy absorption layer 22 can be greater than the thickness of the fundamental frequency infrared laser emission layer 23. The total optical thickness of the excitation light energy absorption layer 22 and the fundamental frequency infrared laser emission layer 23 can be half the laser wavelength. The center position of the fundamental frequency infrared laser emission layer 23 can be at the peak of the laser standing wave field in the integrated laser gain reflector 2. It should be noted that the center position of the fundamental frequency infrared laser emission layer 23 can be located at the peak of the laser standing wave field in the integrated laser gain reflector 2 to achieve maximum gain. The excitation beam control optical element reflection surface 1 9 and the excitation beam control optical element reflection surface 2 10 in the excitation beam control optical element 4 can both cause the excitation beam 3 to be totally reflected thereon. The integrated broadband reflector 16 in the integrated laser gain reflector 2 is composed of several pairs of high refractive index material layers 20 and low refractive index material layers 21 with an optical thickness of one quarter of the laser wavelength. Here, the specific values ​​of the refractive index of the high refractive index material layer 20 and the low refractive index material layer 21 are not limited. For example, the refractive index of the high refractive index material layer 20 can be 3.9. The refractive index of the low refractive index material layer 21 can be 3.5. For example, the integrated broadband reflector 16 can be composed of 30 pairs of high refractive index material layers 20 and low refractive index material layers 21. The material of each high refractive index material layer 20 included in the integrated broadband reflector 16 can be gallium arsenide (GaAs). The material of each low refractive index material layer 21 included in the above-mentioned integrated broadband reflector 16 can be aluminum arsenide (AlAs). The thickness of the above-mentioned high refractive index material layer 20 can be 68nm. The thickness of the above-mentioned low refractive index material layer 21 can be 81nm. The central wavelength of the reflection spectrum of the above-mentioned integrated broadband reflector 16 can be 960nm. The high reflection bandwidth of the above-mentioned integrated broadband reflector 16 can be greater than 80nm, which can provide high reflectivity for the infrared wavelength emitted by the laser gain reflector, and the material barrier of the above-mentioned photogenerated carrier confinement layer 18 can be higher than the material barriers of the above-mentioned excitation light energy absorption layer 22 and the above-mentioned fundamental frequency infrared laser emission layer 23.Therefore, the photogenerated carrier confinement layer 18 can prevent the photogenerated carriers in the excitation light energy absorption layer 22 and the fundamental frequency infrared laser emission layer 23 from diffusing to the outer surface of the integrated laser gain reflector 2 to generate non-radiative recombination.

[0046] The above technical solution, as an inventive point of an embodiment of the present disclosure, solves the following technical problem 2: the factors of "the poor directivity, poor beam quality and poor stability of the visible light laser beam generated by the gas laser" are often as follows: the gas laser generally requires high-voltage discharge excitation. If the above factors are solved, the stability of the visible light band laser and the quality and directivity of the generated visible light laser beam can be improved. In order to achieve this effect, when generating a visible light excitation beam, the present disclosure uses a seamless connection between the excitation beam control optical element 4 in the visible light band laser and the above-mentioned integrated laser gain reflector 2. One end of the polarization control optical element 5 is seamlessly connected to the frequency conversion optical element 6. The other end of the polarization control optical element 5 is seamlessly connected to the excitation beam control optical element 4, and the angle of each optical element is precisely controlled when installing each optical element, so that each element can be tightly connected. The seamless connection between each element can improve the quality and directivity of the generated visible light excitation beam, as well as the stability of the visible light laser.

[0047] In the process of adopting technical solutions to solve the above-mentioned technical problem one, the following technical problem three is often accompanied: before using the visible light band laser, the visible light band laser is directly used without being detected, resulting in cracks in the visible light band laser, which leads to poor stability of the visible light band laser and poor effect of the generated visible light laser beam. For the above-mentioned technical problem three, the conventional solution is generally to directly observe with the naked eye whether the visible light band laser has cracks. The inventor took into account the shortcomings of directly observing with the naked eye whether the visible light band laser has cracks. The inventor's unit has experience in detecting whether the visible light band laser has cracks, and combined with the situation of the cooperative unit commissioned for development, we decided to adopt the following solution:

[0048] Optionally, the above-mentioned visible light band laser is detected by the following operation steps:

[0049] The first step is to take an image of the visible light band laser. In practice, the execution subject may take an image of the visible light band laser by using a camera. For example, the camera may be a high-precision camera.

[0050] In the second step, the captured image is uploaded to the gap detection processor, and the gap detection processor is configured to perform the following steps:

[0051] The third step is to grayscale and normalize the received image to obtain the grayscale and normalized image as the target image. The gap detection processor can be a processor for detecting whether the integrated laser gain reflector 2, the excitation beam control optical element 4, the polarization control optical element 5 and the frequency conversion optical element 6 integrated in the visible light band laser are seamlessly integrated on the optical integrated substrate 1. In practice, the gap detection processor can normalize the received image by using the Z-score normalization algorithm. Then the component method can be used to grayscale the received image to obtain the target image.

[0052] The fourth step is to perform target detection processing on the target image to obtain target position information corresponding to the target image. The target position information can represent the position of a preset target in the target image. The preset target can represent the image of the gap detection processor included in the target image.

[0053] In the fifth step, the target image information is subjected to threshold segmentation processing to obtain each binary image information. The binary image information in each binary image information can represent a binary image. In practice, the gap detection processor can perform threshold segmentation processing on the target image information by a multi-threshold segmentation technique to obtain each binary image information. For example, the multi-threshold segmentation technique can be a fixed multi-threshold method.

[0054] The sixth step is to generate noise point quantity information and noise point position information corresponding to each binary image information in the above-mentioned binary image information according to the above-mentioned binary image information. The above-mentioned noise point quantity information can characterize the number of noise points in the binary image. The above-mentioned noise point position information can characterize the coordinates of the noise points in the binary image. The above-mentioned noise point position information may include the coordinates of each noise point in the above-mentioned binary image information. In practice, firstly, for each binary image information in the above-mentioned binary image information, the above-mentioned gap detection processor may perform traversal processing on the above-mentioned binary image information through a traversal algorithm to obtain the noise point quantity information and noise point position information of the above-mentioned binary image information. For example, the traversal algorithm may be a neighborhood traversal algorithm.

[0055] In the seventh step, based on the above-mentioned information on the number of noise points and the above-mentioned information on the position of noise points, the above-mentioned noise points included in the binary image information that meets the preset deletion condition are deleted to obtain the updated binary image information. Among them, the above-mentioned preset deletion condition can be that the number of noise points corresponding to the binary image information is less than the preset noise point value. Here, the specific value of the above-mentioned preset noise point value is not limited. In practice, the above-mentioned gap detection processor can determine the binary image information that meets the above-mentioned preset deletion condition in the above-mentioned binary image information. Then, based on the noise point position information corresponding to the binary image information that meets the above-mentioned preset deletion condition, the above-mentioned noise points in the binary image information that meets the above-mentioned preset deletion condition are deleted to obtain the updated binary image information.

[0056] In the eighth step, the intensity value of each pixel in each updated binary image information is reset to obtain a denoised image. In practice, the emphasis value of each remaining pixel in the binary image information that meets the preset deletion condition can be set to a preset intensity value. The preset intensity value can be 0. The remaining pixel can represent the remaining pixel after deleting the noise points in the binary image information that meets the preset deletion condition.

[0057] The ninth step is to generate the gap detection information corresponding to the above-mentioned visible light band laser based on the denoised image. The above-mentioned gap detection information can represent the detection result of whether the integrated laser gain reflector 2, the above-mentioned excitation beam control optical element 4, the above-mentioned polarization control optical element 5 and the above-mentioned frequency conversion optical element 6 integrated in the above-mentioned visible light band laser are seamlessly integrated on the above-mentioned optical integrated substrate 1. In practice, the above-mentioned gap detection processor can perform crack detection on the above-mentioned denoised image through a crack detection algorithm to obtain the gap detection information corresponding to the above-mentioned visible light band laser. For example, the crack detection algorithm can be a Canny algorithm.

[0058] The above technical solution, as an inventive point of an embodiment of the present disclosure, solves the third technical problem: the factors of "the stability of the visible light band laser is poor, and the effect of the generated visible light laser beam is poor" are often as follows: before using the visible light band laser, the visible light band laser is directly used without detecting the visible light band laser, and cracks appear in the visible light band laser. If the above factors are solved, the stability of the visible light band laser and the effect of the generated visible light laser beam can be improved. In order to achieve this effect, when detecting whether there is a crack in the visible light band laser, the present disclosure first captures an image of the visible light band laser, and then uploads it to the above gap detection processor to denoise the image, and uses the above gap detection processor to generate gap detection information of the visible light band laser according to the denoised image, so as to determine whether there is a crack in the visible light band laser. In this way, the visible light band laser with cracks can be processed, so as to reduce the situation that the stability of the visible light band laser is poor and the effect of the generated visible light laser beam is poor.

[0059] The above-mentioned embodiments of the present disclosure have the following beneficial effects: through the visible light band laser of some embodiments of the present disclosure, the difficulty of obtaining visible light band laser is reduced, the wavelength diversity and band diversity of the generated visible light are improved, the portability and maneuverability of the laser are improved, and the stability of obtaining visible light band laser is improved. Specifically, the difficulty of obtaining visible light band laser is relatively large, the wavelength and band of the generated visible light are relatively single, the portability and maneuverability of the laser are relatively poor, and the stability of obtaining visible light band laser is relatively poor. The reasons are: when obtaining visible light laser beam by liquid method, the efficiency of obtaining visible light laser beam is low and there are many cases of toxic dyes, which makes it difficult to store or maintain dyes, resulting in greater difficulty in obtaining visible light laser beams; when obtaining visible light laser beams by gas lasers, the stability of gas lasers is poor, resulting in poor stability of the obtained visible light laser beams; the wavelength obtained by solid lasers is relatively single, and the structure of solid lasers is relatively complex, resulting in poor portability and maneuverability; when obtaining visible light laser beams by semiconductor method, the generated band is relatively single and the quality of the generated visible light laser beams is poor. Based on this, the visible light band laser of some embodiments of the present disclosure includes an optical integrated substrate and a laser resonant cavity. Among them, the optical integrated substrate is integrated with an integrated laser gain reflector, an excitation beam control optical element, a polarization control optical element, and a frequency conversion optical element. Among them, the integrated laser gain reflector, the excitation beam control optical element, the polarization control optical element, and the frequency conversion optical element are all seamlessly integrated on the optical integrated substrate. The optical integrated substrate is a thin plate. The fundamental frequency infrared laser layer in the integrated laser gain reflector is composed of each pair of excitation light energy absorption layers and fundamental frequency infrared laser emission layers. The material composition of each excitation light energy absorption layer in the fundamental frequency infrared laser layer and the material composition of each fundamental frequency infrared laser emission layer can be adjusted. The excitation beam control optical element includes an excitation beam control optical element reflection surface 1 and an excitation beam control optical element reflection surface 2. The frequency conversion optical element includes a frequency conversion optical element reflection surface 2. The laser resonant cavity is composed of an integrated broadband reflector at the rear end of the integrated laser gain reflector and a frequency conversion optical element reflection surface 2.In the working state, the excitation light beam is controlled by the excitation light beam control optical element, and after being totally reflected by the reflection surface 1 and the reflection surface 2 of the excitation light beam control optical element, it is projected onto the surface of the integrated laser gain reflector and refracted into the interior of the integrated laser gain reflector, so as to be absorbed by the excitation light energy absorption layer inside the integrated laser gain reflector to obtain photogenerated carriers. The photogenerated carriers emitted inside the integrated laser gain reflector undergo stimulated radiation transition in the laser resonant cavity and form laser oscillation to generate a fundamental frequency infrared laser beam. The generated fundamental frequency infrared laser beam is converted into linearly polarized light after passing through the polarization control optical element. After the linearly polarized light enters the frequency conversion optical element, the frequency conversion optical element outputs a visible light laser beam. Also, because the laser wavelength emitting material in the laser gain reflector in the above-mentioned visible light band laser is a semiconductor material, and the material composition of each excitation light energy absorption layer in the above-mentioned fundamental frequency infrared laser layer and the material composition of each fundamental frequency infrared laser emitting layer in the above-mentioned visible light band laser can be adjusted, the emission wavelength of the above-mentioned visible light band laser covers a wide range, and after frequency conversion, the obtained visible light laser wavelength almost covers the entire visible light wavelength range, thereby improving the diversity of wavelengths and bands. Also, because the above-mentioned integrated laser gain reflector, excitation beam, excitation beam control optical element, polarization control optical element, and frequency conversion optical element are seamlessly integrated into the above-mentioned optical integrated substrate, the size of the laser is reduced, and the weight of the laser is reduced, thereby further improving the stability and reliability of the laser, and the above-mentioned integrated laser gain reflector, excitation beam, excitation beam control optical element, polarization control optical element, and frequency conversion optical element are integrated into an optical integrated substrate, so that the visible light laser beam can be obtained only through the optical integrated substrate, and the modularization of the laser is realized, thereby improving the portability and mobility of the laser. In addition, because the optical integrated substrate has the function of dissipating heat for optical components, the stability of the output visible light laser beam can be improved. As a result, the difficulty of obtaining visible light band lasers can be reduced, the wavelength diversity and band diversity of the generated visible light can be improved, the portability and maneuverability of the laser can be improved, and the stability of obtaining visible light band lasers can be improved.

[0060] Reference below Figure 5 , which shows a schematic structural diagram of an electronic device 500 (eg, a computing device) suitable for implementing some embodiments of the present disclosure. Figure 5 The electronic device shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present disclosure.

[0061] like Figure 5As shown, the electronic device 500 may include a processing device 501 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 502 or a program loaded from a storage device 508 to a random access memory (RAM) 503. In the RAM 503, various programs and data required for the operation of the electronic device 500 are also stored. The processing device 501, the ROM 502, and the RAM 503 are connected to each other via a bus 504. An input / output (I / O) interface 505 is also connected to the bus 504.

[0062] Typically, the following devices may be connected to the I / O interface 505: an input device 506 including, for example, a touch screen, a touch pad, a keyboard, a mouse, a camera, a microphone, an accelerometer, a gyroscope, etc.; an output device 507 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; a storage device 508 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 509. The communication device 509 may allow the electronic device 500 to communicate with other devices wirelessly or by wire to exchange data. Although Figure 5 The electronic device 500 is shown with various devices, but it should be understood that it is not required to implement or possess all the devices shown. More or fewer devices may be implemented or possessed instead. Figure 5 Each block shown in the figure may represent one device, or may represent multiple devices as required.

[0063] In particular, according to some embodiments of the present disclosure, the process described above with reference to the flowchart can be implemented as a computer software program. For example, some embodiments of the present disclosure include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In some such embodiments, the computer program can be downloaded and installed from the network through the communication device 509, or installed from the storage device 508, or installed from the ROM 502. When the computer program is executed by the processing device 501, the above-mentioned functions defined in the method of some embodiments of the present disclosure are executed.

[0064] It should be noted that the computer-readable medium recorded in some embodiments of the present disclosure may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In some embodiments of the present disclosure, a computer-readable storage medium may be any tangible medium containing or storing a program, which may be used by or in combination with an instruction execution system, device or device. In some embodiments of the present disclosure, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, which carries a computer-readable program code. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer readable signal media may also be any computer readable medium other than computer readable storage media, which may send, propagate or transmit a program for use by or in conjunction with an instruction execution system, apparatus or device. The program code contained on the computer readable medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (radio frequency), etc., or any suitable combination of the above.

[0065] In some embodiments, the client and the server may communicate using any currently known or future developed network protocol such as HTTP (HyperText Transfer Protocol), and may be interconnected with any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include a local area network ("LAN"), a wide area network ("WAN"), an internet (e.g., the Internet), and a peer-to-peer network (e.g., an ad hoc peer-to-peer network), as well as any currently known or future developed network.

[0066] The computer-readable medium may be included in the electronic device; or it may exist independently without being assembled into the electronic device. The computer-readable medium carries one or more programs. When the one or more programs are executed by the electronic device, the electronic device: performs grayscale processing and normalization processing on the received image to obtain the grayscale processed and normalized image as the target image; performs target detection processing on the target image to obtain target position information corresponding to the target image; performs threshold segmentation processing on the target image information to obtain each binary image information; generates noise point quantity information and noise point position information corresponding to each binary image information in the binary image information according to the binary image information; performs deletion processing on each noise point included in the binary image information that meets the preset deletion condition in the binary image information according to the noise point quantity information and the noise point position information to obtain each updated binary image information; resets the intensity value of each pixel point in the updated binary image information to obtain a denoised image; generates gap detection information corresponding to the visible light band laser according to the denoised image.

[0067] Computer program code for performing the operations of some embodiments of the present disclosure may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0068] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present disclosure. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some implementations as replacements, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0069] The functions described above herein may be performed at least in part by one or more hardware logic components. For example, without limitation, exemplary types of hardware logic components that may be used include: field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), complex programmable logic devices (CPLDs), and the like.

[0070] The above descriptions are only some preferred embodiments of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present disclosure is not limited to the technical solutions formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the embodiments of the present disclosure.

Claims

1. A visible light band laser, characterized in that: The visible light band laser comprises an optical integrated substrate and a laser resonant cavity, wherein: An integrated laser gain reflector, an excitation light beam control optical element, a polarization control optical element and a frequency conversion optical element are integrated on the optical integrated substrate, wherein the integrated laser gain reflector, the excitation light beam control optical element, the polarization control optical element and the frequency conversion optical element are all seamlessly integrated on the optical integrated substrate, the optical integrated substrate is a thin plate, the fundamental frequency infrared laser layer in the integrated laser gain reflector is composed of each pair of excitation light energy absorption layers and fundamental frequency infrared laser emission layers, and the material composition of each excitation light energy absorption layer and the material composition of each fundamental frequency infrared laser emission layer in the fundamental frequency infrared laser layer can be adjusted; The excitation beam control optical element comprises an excitation beam control optical element reflection surface 1 and an excitation beam control optical element reflection surface 2, and the frequency conversion optical element comprises a frequency conversion optical element reflection surface 2; The laser resonant cavity is composed of an integrated broadband reflector at the rear end of the integrated laser gain reflector and a second reflective surface of the frequency conversion optical element; In a working state, the excitation light beam is controlled by the excitation light beam control optical element, and after being totally reflected by the first reflection surface and the second reflection surface of the excitation light beam control optical element, it is projected onto the surface of the integrated laser gain reflector and refracted into the interior of the integrated laser gain reflector, so as to be absorbed by the excitation light energy absorption layer inside the integrated laser gain reflector to obtain photogenerated carriers. The photogenerated carriers emitted inside the integrated laser gain reflector undergo stimulated radiation transition in the laser resonant cavity and form laser oscillation to generate a fundamental frequency infrared laser beam. The generated fundamental frequency infrared laser beam is converted into linearly polarized light after passing through the polarization control optical element. After the linearly polarized light enters the frequency conversion optical element, the frequency conversion optical element outputs a visible light laser beam.

2. The visible light band laser according to claim 1, characterized in that: The integrated laser gain reflector comprises an integrated laser gain reflector substrate, an integrated broadband reflector, a fundamental frequency infrared laser layer, a photogenerated carrier confinement layer, and an integrated laser gain reflector protection layer.

3. The visible light band laser according to claim 1, characterized in that: The shape of the excitation beam control optical element is a triangular or polygonal element, and the excitation beam control optical element is made of transparent material.

4. The visible light band laser according to claim 1, characterized in that: The polarization control optical element is in the shape of a polygonal element. The polarization control optical element is made of a transparent material. The transparent material is transparent to the excitation light wavelength and the near-infrared wavelength. The polarization control optical element comprises a first reflective surface of the polarization control optical element and a second reflective surface of the polarization control optical element. The first reflective surface of the polarization control optical element is coated with a film layer that is transparent to the fundamental frequency infrared laser beam. The fundamental frequency infrared laser beam is converted into linearly polarized light after passing through the second reflective surface of the polarization control optical element.

5. The visible light band laser according to claim 1, characterized in that: The frequency conversion optical element also includes a first reflective surface of the frequency conversion optical element, on which is coated a film layer through which the fundamental frequency infrared laser beam is transparent; a second reflective surface of the frequency conversion optical element is at an angle such that the fundamental frequency infrared laser beam is normally incident thereon; and the second reflective surface of the frequency conversion optical element is coated with a film layer through which the fundamental frequency infrared laser beam is reflected, and a film layer through which the laser wavelength of the visible light laser beam is transparent.

6. The visible light band laser according to claim 1, characterized in that: One end of the polarization control optical element is connected to the frequency conversion optical element, and the other end of the polarization control optical element is connected to the excitation beam control optical element.

7. The visible light band laser according to claim 1, characterized in that: The excitation light beam is a parallel laser light beam.

8. The visible light band laser according to claim 1, characterized in that: The frequency conversion optical element is a critical phase matching or non-critical phase matching nonlinear crystal, and the nonlinear crystal is transparent to the fundamental frequency infrared laser beam emitted by the integrated laser gain reflector and its corresponding visible light wavelength.

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