A laser device for obtaining a micro-sized light beam and a light path debugging method

Abstract

This invention claims protection for a laser device and optical path debugging method for acquiring micro-sized beams, belonging to the field of solid-state laser technology. The device structure includes: an indicator light source, a high-gain module, a micro-sized pinhole aperture, a micro-sized output mirror, and a micro-sized reflector. The debugging method consists of the following steps: S1: Determine the pitch and yaw of the micro-sized reflector using the indicator light source and the micro-sized pinhole aperture; S2: Determine the spontaneous emission light path of the high-gain module based on the micro-sized reflector and the two micro-sized pinhole apertures; S3: Add the micro-sized output mirror to achieve laser resonator oscillation based on the micro-sized cavity mirror. Because the cavity mirror is small enough, this invention eliminates the need for external pinhole beam contraction, reducing diffraction effects. Furthermore, by using an internal pinhole aperture to determine the optical path, it solves the problem of the spontaneous emission amplification optical path of the module not coinciding with the resonator oscillation optical path, improving output power and meeting the requirements for outputting micro-sized beams based on a high-gain module.

Description

Technical Field

[0001] This invention relates to the field of laser technology, specifically to a laser device for acquiring micro-sized beams and a method for adjusting the optical path, which is particularly applicable to solid-state lasers under high-gain modules and micro-sized cavity mirrors. Background Technology

[0002] All-solid-state lasers refer to lasers where both the gain medium and the pump source are solid-state. They are characterized by high luminous efficiency, a wide output spectral range, compact structure, and good vibration resistance, and are widely used in laser guidance and scientific research. Meanwhile, with the development of technology, fields such as optical tweezers, lidar, satellite internet, and precision machining require increasingly smaller laser output beam sizes. Traditional methods for reducing beam size involve inserting small apertures in the optical path; however, due to diffraction, the smaller the aperture size, the more severe the diffraction effect and the greater the loss, making it difficult to achieve micro-sized beams. Furthermore, existing optical path adjustment methods cannot meet the requirement that the spontaneous emission amplification optical path of the high-gain module coincide with the resonant cavity oscillation optical path.

[0003] This invention designs a laser device and optical path debugging method for acquiring micro-sized beams. It uses a micro-sized lens as a cavity mirror and a micro-sized aperture is used inside the cavity to determine the optical path, thereby realizing the oscillation of the laser resonator based on the micro-sized cavity mirror. This method has the characteristics of reducing beam size and reducing diffraction effect.

[0004] CN103151690B, a solid-state laser, comprising: an output mirror 1, a frustum-shaped annular reflecting prism 2, an annular solid-state laser gain medium 3, an annular lens 4 with total reflection end, and a total reflection mirror 5 arranged sequentially in the optical path; and forming a resonant cavity between the output mirror 1 and the total reflection mirror 5.

[0005] 1. Different objectives: The objective of this patent is to increase the emission power of the laser.

[0006] The objective of this invention is to obtain micro-sized light beams.

[0007] 2. Different methods: This patent designs the gain medium into two spatially separated parts, improving heat dissipation. It also uses a specifically shaped annular frustum-shaped reflecting prism to spatially combine them into a single laser beam during output, thus greatly enhancing the intensity of the output laser beam.

[0008] This invention designs the resonant cavity mirror as a micro-sized cavity mirror. By inserting a micro-sized aperture into the cavity, the spontaneous emission amplification optical path of the module coincides with the resonant cavity oscillation optical path, thereby realizing the oscillation of the micro-sized cavity mirror laser resonant cavity.

[0009] 3. Different effects: The gain medium and resonant cavity mirror in this patented design are fixed.

[0010] This invention can achieve the output of micro-sized laser beams with different radii by combining different cavity mirror sizes. Summary of the Invention

[0011] This invention aims to solve the problems of the prior art mentioned above. It proposes a laser device and debugging method for acquiring micro-sized light beams. The technical solution of this invention is as follows:

[0012] A laser device for acquiring a micro-sized beam includes: an indicator light source (1), a micro-sized output mirror (2), a first micro-sized aperture stop (3), a second micro-sized aperture stop (4), a high-gain module (5), a third micro-sized aperture stop (6), and a micro-sized reflector (7), wherein the indicator light source (1), the micro-sized output mirror (2), the first micro-sized aperture stop (3), the second micro-sized aperture stop (4), the high-gain module (5), the third micro-sized aperture stop (6), and the micro-sized reflector (7) are arranged adjacent to each other along the optical path (8); The indicator light source (1) serves as the collimating light source for the optical path debugging system; the high-gain module includes a pump source and a gain medium, wherein the pump source serves as the excitation source for the gain medium, enabling it to achieve population inversion; the first micro-sized aperture stop (3), the second micro-sized aperture stop (4), the high-gain module (5), and the third micro-sized aperture stop (6) are used to limit the optical path. The three micro-sized aperture stops and the cylindrical gain medium of the high-gain module limit the optical path to a fixed straight line; the micro-sized output mirror (2) and the micro-sized reflector (7) constitute the resonant cavity of the laser.

[0013] Furthermore, the indicator light source (1) includes various suitable indicator light sources, including gas lasers, solid-state lasers and semiconductor lasers.

[0014] Furthermore, the high-gain module (5) refers to a laser module that has spontaneous emission amplified light, and the pumping method includes various pumping methods such as side pumping and end-face pumping; the gain medium includes various laser crystals such as Nd:YAG crystal, Nd:YLF crystal, Nd:KGW crystal and Nd:YVO4 crystal; the working mode can be continuous or pulsed.

[0015] Furthermore, the aperture size of the first micro-sized aperture stop (3), the second micro-sized aperture stop (4), and the third micro-sized aperture stop (6) is less than 4000 μm, and the material is a metal or ceramic material with high thermal conductivity.

[0016] Furthermore, the lens size of the micro-sized output mirror (2) and the micro-sized reflector (7) is less than 4000 μm. The micro-sized output mirror (2) is a device with a beam-splitting function, which is a prism or grating, and its transmittance range is not limited.

[0017] An optical path debugging method based on any one of the systems described herein includes the following steps:

[0018] S1: The pitch and yaw of the micro-sized mirror are determined using the indicator light source (1) and the third micro-sized aperture (6);

[0019] S2: Determine the spontaneous emission optical path of the high-gain module based on the micro-sized mirror (7), the first micro-sized aperture stop (3), and the second micro-sized aperture stop (4);

[0020] S3: Add a micro-sized output mirror (2) to realize the laser resonator oscillation based on the micro-sized cavity mirror.

[0021] Furthermore, step S1 specifically includes: the collimated light source emitted by the indicator light source (1) passes through the gain medium of the high gain module (5) and hits the center of the third micro-sized aperture (6), and the third micro-sized aperture (6) is fixed; the collimated light source after the third micro-sized aperture (6) is beam-constricted and hits the micro-sized reflector (7), the pitch and yaw of the micro-sized reflector (7) are adjusted so that the reflected light hits the center of the aperture again, and the micro-sized reflector (7) is fixed.

[0022] Furthermore, step S2 specifically includes: blocking the indicator light source, turning on the high-gain module, increasing the current value until it generates spontaneous emission amplified light, first using the second micro-aperture aperture for coarse adjustment so that the spontaneous emission amplified light hits the center of the second micro-aperture aperture, and fixing the second micro-aperture aperture; then using the first micro-aperture aperture for fine adjustment so that the light passing through the second micro-aperture aperture hits the center of the first micro-aperture aperture, and fixing the first micro-aperture aperture, thereby determining the optical path of the spontaneous emission amplified light.

[0023] Furthermore, step S3 specifically includes:

[0024] Slightly away from the first micro-aperture aperture, a micro-output mirror is inserted into the optical path. The pitch and yaw of the micro-output mirror are adjusted so that the spontaneous emission amplified light re-enters the first and second micro-aperture apertures, making the spontaneous emission amplification optical path of the module coincide with the oscillation optical path of the resonant cavity, thus realizing the oscillation of the micro-cavity mirror laser resonant cavity.

[0025] The advantages and beneficial effects of this invention are as follows:

[0026] This invention relates to a laser device and optical path adjustment method for obtaining micro-sized laser beams. It utilizes the spontaneous emission amplification light generated by a high-gain module to adjust the output mirror. Simultaneously, by inserting a micro-sized aperture into the cavity, the spontaneous emission amplification optical path of the module coincides with the oscillation optical path of the resonant cavity, thereby realizing the oscillation of the laser resonant cavity based on the micro-sized cavity mirror, and thus generating a micro-sized laser beam.

[0027] This invention relates to a laser device and optical path adjustment method for acquiring micro-sized laser beams. First, a micro-sized cavity mirror is designed. By changing the size of the cavity mirror, different micro-sized laser beams can be output. Second, the spontaneous emission amplification light generated by a high-gain module is used to adjust the output mirror. Simultaneously, by inserting a micro-sized aperture within the cavity, the spontaneous emission amplification optical path of the module coincides with the oscillation optical path of the resonant cavity, achieving laser resonant cavity oscillation based on the micro-sized cavity mirror, thereby generating a micro-sized laser beam. This invention features a simple device that can achieve micro-sized laser beam output without the need for an external aperture to control the light. Furthermore, by changing the size of the micro-sized cavity mirror and the micro-sized aperture, micro-sized laser beams with different radii can be output. Attached Figure Description

[0028] Figure 1 This is a structural diagram of a laser device for acquiring micro-sized light beams according to a preferred embodiment of the present invention.

[0029] Figure 2 The pitch and yaw of the micro-sized mirror are determined by using an indicator light source and a micro-sized aperture.

[0030] Figure 3 The spontaneous emission optical path of the high-gain module is determined based on the micro-sized mirror and two micro-sized aperture stops.

[0031] Figure 4 It involves adding a micro-sized output mirror to achieve laser resonator oscillation based on a micro-sized cavity mirror. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and thoroughly described below with reference to the accompanying drawings. The described embodiments are merely some embodiments of the present invention.

[0033] The technical solution of the present invention to solve the above-mentioned technical problems is:

[0034] The structure of a laser device for acquiring micro-sized beams and an optical path adjustment method is as follows: Figure 1 As shown, it mainly includes: an indicator light source 1, a high-gain module 5, a first micro-aperture aperture 3, a second micro-aperture aperture 4, a third micro-aperture aperture 6, a micro-output mirror 2, and a micro-reflector 7. The indicator light source 1, micro-output mirror 2, first micro-aperture aperture 3, second micro-aperture aperture 4, high-gain module 5, third micro-aperture aperture 6, and micro-reflector 7 are arranged sequentially along the optical path 8.

[0035] The indicator light source serves as the collimating light source for the optical path adjustment system; the high-gain module mainly refers to a module with extremely high gain, including a pump source and a gain medium, wherein the pump source serves as the excitation source for the gain medium, enabling it to achieve population inversion; the micro-sized aperture is used to define the optical path; the micro-sized output mirror and the micro-sized reflector form the resonant cavity of the laser.

[0036] Preferably, the indicator light source 1 includes various suitable indicator light sources such as gas lasers, solid-state lasers, and semiconductor lasers.

[0037] Preferably, the high-gain module 5 refers to a laser module that has spontaneous emission amplified light, and the pumping method includes various pumping methods such as side pumping and end-face pumping; the gain medium includes various laser crystals such as Nd:YAG crystal, Nd:YLF crystal, Nd:KGW crystal and Nd:YVO4 crystal; the operating mode can be continuous or pulsed.

[0038] Preferably, the aperture size of the first micro-sized aperture 3, the second micro-sized aperture 4, and the third micro-sized aperture 6 is less than 4000 μm, and the material is a metal or ceramic with high thermal conductivity.

[0039] Preferably, the lens size of the micro-sized output mirror 2 and the micro-sized reflector 7 is less than 4000 μm. The micro-sized output mirror can be a prism, grating or other device with a beam-splitting function, and its transmittance range is not limited.

[0040] A method for acquiring a laser beam of micro-sized size and for adjusting the optical path specifically includes the following steps:

[0041] S1: Determine the pitch and yaw of the micro-sized mirror using an indicator light source and a micro-sized aperture.

[0042] In step S1, as Figure 2 As shown, the collimated light emitted by the indicator light source passes through the gain medium of the high-gain module and strikes the center of the third micro-aperture stop 6. The third micro-aperture stop 6 is then fixed. The collimated light source, after beam contraction by the third micro-aperture stop 6, strikes the micro-reflector. The pitch and yaw of the micro-reflector are adjusted so that the reflected light returns to the center of the aperture. The micro-reflector is then fixed.

[0043] S2: Determine the spontaneous emission optical path of the high-gain module based on the micro-sized mirror and two micro-sized aperture stops.

[0044] In step S2, as Figure 3As shown, the indicator light source is blocked, the high-gain module is turned on, and the current value is increased until spontaneous emission amplified light is generated. First, coarse adjustment is performed using the second micro-aperture aperture 4 so that the spontaneous emission amplified light hits the exact center of the second micro-aperture aperture 4, and then the second micro-aperture aperture 4 is fixed. Then, fine adjustment is performed using the first micro-aperture aperture 3 so that the light passing through the second micro-aperture aperture 4 hits the exact center of the first micro-aperture aperture 3, and then the first micro-aperture aperture 3 is fixed, thus determining the optical path of the spontaneous emission amplified light. The distance between the first micro-aperture aperture 3 and the second micro-aperture aperture 4 is as large as possible.

[0045] S3: Add a micro-sized output mirror to achieve laser resonator oscillation based on a micro-sized cavity mirror.

[0046] In step S3, as Figure 4 As shown, a micro-sized output mirror 2 is inserted into the optical path at a distance slightly from the first micro-sized aperture 3. The pitch and yaw of the micro-sized output mirror are adjusted so that the spontaneous emission amplified light re-enters the first micro-sized aperture 3 and the second micro-sized aperture 4, so that the spontaneous emission amplification optical path of the module coincides with the resonant cavity oscillation optical path, thereby realizing the laser resonant cavity oscillation based on the micro-sized cavity mirror.

[0047] The following are specific embodiments: Preferred embodiment 1: As a preferred embodiment, the indicator light source adopts a He-Ne laser, the high-gain module adopts a side-pumped three-way structure, the gain medium is Nd:YAG crystal, the working mode is pulsed, the micro-sized aperture 123 is made of ceramic material with an aperture of 300um, the micro-sized reflector and the micro-sized output mirror adopt an aperture of 300um, and the micro-sized output mirror adopts a transmittance of 20%.

[0048] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separable. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0049] In summary, this invention studies a laser device for acquiring micro-sized beams and a method for adjusting the optical path. First, the pitch and yaw of the micro-sized mirror are determined using an indicator light source and a micro-sized pinhole aperture. Then, the spontaneous emission optical path of the high-gain module is determined based on the micro-sized mirror and two micro-sized pinhole apertures. Finally, a micro-sized output mirror is added to achieve laser resonator oscillation based on a micro-sized cavity mirror.

[0050] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0051] The above embodiments should be understood as illustrative only and not as limiting the scope of protection of the present invention. After reading the description of the present invention, those skilled in the art can make various alterations or modifications to the present invention, and these equivalent changes and modifications also fall within the scope defined by the claims of the present invention.

Claims

1. A laser device for obtaining a micro-sized light beam, characterized by, The application relates to a light path debugging system, which comprises an indicating light source (1), a micro-size output mirror (2), a first micro-size pinhole diaphragm (3), a second micro-size pinhole diaphragm (4), a high-gain module (5), a third micro-size pinhole diaphragm (6) and a micro-size reflecting mirror (7), wherein the indicating light source (1), the micro-size output mirror (2), the first micro-size pinhole diaphragm (3), the second micro-size pinhole diaphragm (4), the high-gain module (5), the third micro-size pinhole diaphragm (6) and the micro-size reflecting mirror (7) are sequentially arranged along a light path (8); the indicating light source (1) is used as a collimated light source of the light path debugging system; the high-gain module comprises a pumping source and a gain medium, wherein the pumping source is used as an excitation source of the gain medium to realize particle number inversion; the first micro-size pinhole diaphragm (3), the second micro-size pinhole diaphragm (4), the high-gain module (5) and the third micro-size pinhole diaphragm (6) are used for limiting the light path; the micro-size output mirror (2) and the micro-size reflecting mirror (7) constitute a resonant cavity of a laser; The high-gain module (5) is a laser module with spontaneous emission amplification light, and the pumping mode comprises various pumping modes such as side pumping and end face pumping; the gain medium comprises various laser crystals such as Nd:YAG crystal, Nd:YLF crystal, Nd:KGW crystal and Nd:YVO4 crystal; and the working mode can be continuous or pulsed mode; The aperture size of the first micro-size pinhole diaphragm (3), the second micro-size pinhole diaphragm (4) and the third micro-size pinhole diaphragm (6) is less than 4000 mu m, and the material is high-thermal-conductivity metal or ceramic material; The lens size of the micro-size output mirror (2) and the micro-size reflecting mirror (7) is less than 4000 mu m, and the micro-size output mirror (2) is a device with light splitting effect such as prism or grating, and the transmittance range is not limited; The collimated light source emitted by the indicating light source (1) passes through the gain medium of the high-gain module (5) and hits the center of the third micro-size pinhole diaphragm (6), and the third micro-size pinhole diaphragm (6) is fixed; the collimated light source is shrunk by the third micro-size pinhole diaphragm (6), and the shrunk collimated light source hits the micro-size reflecting mirror (7); the pitch and yaw of the micro-size reflecting mirror (7) are adjusted to make the reflected light hit the center of the pinhole again, and the micro-size reflecting mirror (7) is fixed; The indicating light source is shielded, the high-gain module is started, the current value is increased, and spontaneous emission amplification light is generated; the second micro-size pinhole diaphragm is used for coarse adjustment, the spontaneous emission amplification light hits the center of the second micro-size pinhole diaphragm, and the second micro-size pinhole diaphragm is fixed; the first micro-size pinhole diaphragm is used for fine adjustment, the light passing through the second micro-size pinhole diaphragm hits the center of the first micro-size pinhole diaphragm, and the first micro-size pinhole diaphragm is fixed, so that the light path of the spontaneous emission amplification light is determined. ​ A micro-size output mirror is inserted in the light path at a position slightly far from the first micro-size pinhole diaphragm, and the pitch and yaw of the micro-size output mirror are adjusted so that the spontaneous emission amplification light is re-incident on the first micro-size pinhole diaphragm and the second micro-size pinhole diaphragm, the spontaneous emission amplification light path of the module is coincident with the light path for starting the resonator, and the micro-size cavity mirror laser resonator is started.

2. The laser device for obtaining a micro-sized beam according to claim 1, wherein, The indicating light source (1) includes various light sources suitable for indication, such as gas lasers, solid-state lasers and semiconductor lasers.

3. An optical path adjustment method based on the system of any one of claims 1-2, characterized in that, The method comprises the following steps: S1: determining the pitch and yaw of the micro-size mirror by using the indicating light source (1) and the third micro-size pinhole diaphragm (6); S2: determining the light path of the spontaneous emission light of the high-gain module according to the micro-size mirror (7) and the first micro-size pinhole diaphragm (3) and the second micro-size pinhole diaphragm (4); S3: adding the micro-size output mirror (2) to realize the starting of the laser resonator based on the micro-size cavity mirror.

4. The optical path debugging method according to claim 3, wherein The step S1 specifically comprises: the collimated light source emitted by the indicating light source (1) is incident on the center of the third micro-size pinhole diaphragm (6) after passing through the gain medium of the high-gain module (5), and the third micro-size pinhole diaphragm (6) is fixed; the collimated light source is shrunk by the third micro-size pinhole diaphragm (6) and is incident on the micro-size mirror (7), and the pitch and yaw of the micro-size mirror (7) are adjusted so that the reflected light is re-incident on the center of the pinhole, and the micro-size mirror (7) is fixed.

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