A detection device and method for self-calibration of a laser beam

Abstract

The present application relates to the technical field of milling cutters, and particularly relates to a detection device for self-calibration of a laser beam. The device comprises an adjustable adjusting support, a connecting seat, a reference mounting frame arranged at the front end of the connecting seat, and a detection unit arranged on the reference mounting frame. The detection unit comprises, from front to back, a focusing lens, a Brewster measurement unit for measuring the Rz position of the laser beam, a second detection unit for measuring the Rx and Ry positions of the laser beam, and a four-quadrant measurement unit for measuring the X and Y positions of the laser beam. The present application has the following advantages: the technical solution can adjust the laser light source in five degrees of freedom directions of X / Y / Rx / Ry / Rz, and the laser light source is adjusted by three optical measurement mechanisms to achieve high-precision adjustment of the laser incidence position and angle, so that the laser light source can be directly coupled into the optical fiber with maximum efficiency when it is first installed, and the device is widely applicable in many invisible laser application scenarios.

Description

Technical Field

[0001] This invention relates to the field of optical coupling technology, and in particular to a detection device and method for self-calibration of laser beams. Background Technology

[0002] When a laser source is coupled into an optical fiber, it requires extremely high positioning accuracy and incident angle; otherwise, a large amount of light energy transmitted through the optical fiber will be lost.

[0003] Existing similar products achieve maximum efficient coupling between the fiber and the laser diode by adjusting the fiber's entry position and angle (X / Y / Rx / Ry). The traditional approach involves adjusting the fiber individually on parameters such as X / Y / Rx / Ry to match the laser source. Due to the high performance requirements, manual adjustment is extremely difficult and not easily quantifiable, causing significant challenges to daily adjustment work. This is especially true in the initial coarse-tuning stage, which consumes a considerable amount of time.

[0004] Therefore, it is necessary to design a detection device and method for self-calibration of laser beams to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a detection device for self-calibration of laser beams, so as to overcome the above-mentioned shortcomings of the existing technology.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A detection device for self-calibration of a laser beam includes an adjustable adjustment bracket, a second adjustment bracket disposed at the front end of the adjustment bracket, a connecting seat mounted at the end of the second adjustment bracket, a reference mounting bracket disposed at the front end of the connecting seat, and a detection unit disposed on the reference mounting bracket. The detection unit includes a focusing lens disposed from front to back, a Brewster measurement unit for measuring the Rz position of the laser beam, a second detection unit for measuring the Rx and Ry positions of the laser beam, and a four-quadrant measurement unit for measuring the X and Y positions of the laser beam.

[0008] Preferably, vibration isolation plates are provided on both the adjusting bracket and the second adjusting bracket.

[0009] Preferably, a light-absorbing unit is provided at the front end of the detection unit, and a diode is provided on the side.

[0010] Preferably, a shutter is also provided in front of the focusing lens.

[0011] A detection device and method for self-calibration of laser beams specifically includes the following steps:

[0012] Installing a laser source: The laser source is positioned between the adjusting bracket and the second adjusting bracket, and is subject to the adjustment and movement of the adjusting bracket and the second adjusting bracket. The adjusting bracket and the second adjusting bracket can adjust the laser source in five degrees of freedom, namely X / Y / Rx / Ry / Rz.

[0013] The laser source is first shone into the Brewster measurement unit, and the position deviation of Rz is calculated.

[0014] Then, the particles are sequentially injected into the second detection unit and the four-quadrant measurement unit, and the positional deviations of X / Y / Rx / Ry are calculated.

[0015] Based on the calculated deviation value, the position is adjusted again using the adjustment bracket and the second adjustment bracket in conjunction, thereby ensuring that the laser source can be coupled into the optical fiber with maximum efficiency from the very beginning of installation.

[0016] The beneficial effects of this invention are: this technical solution can adjust the laser source in five degrees of freedom, such as X / Y / Rx / Ry / Rz, and achieve high-precision adjustment of the laser incident position and angle by detecting and adjusting the laser source through three optical measurement mechanisms, thereby ensuring that the laser source can be coupled into the optical fiber with maximum efficiency from the initial installation, and is widely applicable to many invisible laser application scenarios; the combination of the adjustment bracket and the detection unit can transform the complex laboratory adjustment method into an applicable scenario that is easy to mass-produce in industry. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a laser beam self-calibration detection device according to the present invention;

[0018] Figure 2 This is a simplified structural diagram of a laser beam self-calibration detection device according to the present invention;

[0019] Figure 3 This is a schematic diagram of the Brewster measurement unit of a laser beam self-calibration detection device according to the present invention.

[0020] In the diagram: 1. Adjustment bracket; 2. Second adjustment bracket; 3. Connecting seat; 4. Reference mounting bracket; 5. Detection unit; 6. Light absorption unit; 7. Diode; 51. Focusing lens; 52. Brewster measurement unit; 53. Second detection unit; 54. Four-quadrant measurement unit; 55. Shutter. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0023] Reference Figures 1 to 3 A detection device for self-calibration of a laser beam includes an adjustable adjustment bracket 1, a second adjustment bracket 2 disposed at the front end of the adjustment bracket 1, a connecting seat 3 mounted at the end of the second adjustment bracket 2, a reference mounting bracket 4 disposed at the front end of the connecting seat 3, and a detection unit 5 disposed on the reference mounting bracket 4.

[0024] To increase the stability of the frame, prevent shaking, and improve accuracy, vibration isolation plates are installed on both the adjustment bracket and the second adjustment bracket.

[0025] A light-absorbing unit 6 is also provided at the front end of the detection unit 5, and a diode 7 is also provided on the side.

[0026] The detection unit 5 includes a focusing lens 51 arranged from front to back, a Brewster measurement unit 52 for measuring the position Rz of the laser beam, a second detection unit 53 for measuring the positions Rx and Ry of the laser beam, and a four-quadrant measurement unit 54 for measuring the positions X and Y of the laser beam; a shutter 55 is also provided in front of the focusing lens 51.

[0027] The focusing lens 51 is used in conjunction with the Brewster measurement unit 52, which measures the Rz position of the laser beam. It utilizes the Brewster principle in optics, which states that when natural light is reflected and refracted at the interface between two isotropic dielectrics, the polarization state of the light changes. When the incident angle is equal to the Brewster angle, the reflected light becomes linearly polarized only perpendicular to the incident plane, while the transmitted light becomes linearly polarized horizontally to the incident plane. Since the laser itself is linearly polarized, when the optical crystal in the preceding optical path forms the Brewster angle, by rotating the Rz direction of the laser so that the polarization direction of the laser is exactly in the same plane as the incident plane, the intensity energy of the reflected light is minimized, while the intensity energy of the transmitted light is maximized.

[0028] The second detection unit 53 includes a Michelson tool, a focusing lens, and a four-quadrant measuring instrument. It measures the Rx / Ry position of the laser beam. A new reference beam is created using the Michelson tool, set as the beam with an incident angle (Rx=0, Ry=0), where angle θ is the angle between the actual beam to be measured and the reference beam. After passing through the Michelson tool's beam splitter and corner reflector, the angle difference is amplified to 2θ. After passing through the focusing lens, the positional deviation reflected on the four-quadrant measuring instrument is D=f*2θ. Therefore, the 1 / 3 beam overlap can be distinguished. Specifically: , Where D is the spot diameter, the angular measurement accuracy of the wavelength can be calculated.

[0029] The four-quadrant measurement unit 54 is used to measure the X / Y position of the laser beam. Specifically, it is a four-quadrant detector, which consists of four equal photodetectors packaged into a whole. Because there is a cross-shaped gap on the silicon wafer of the detector, and the center of the detector is the intersection point generated by the cross-shaped separation, the laser beam centered on the detector will generate an equal current from each part, converting the movement of the beam into different currents on each segment. By processing these data, the fluctuation of the beam center can be calculated, thereby obtaining the X / Y position.

[0030] In this implementation method, a laser source is positioned between the adjustment bracket 1 and the second adjustment bracket 2, and is adjusted and moved by the adjustment bracket 1 and the second adjustment bracket 2. The adjustment bracket 1 and the second adjustment bracket 2 can adjust the laser source in five degrees of freedom, namely X / Y / Rx / Ry / Rz. After the position and angle of the laser source are adjusted, the self-calibration tool can be easily removed. Specifically, the method includes the following steps: the laser source is first injected into the Brewster measurement unit 52, and the position deviation of Rz is calculated. Then, it is injected into the second detection unit 53 and the four-quadrant measurement unit 54 in sequence, and the position deviations of X / Y / Rx / Ry are calculated. Based on the calculated deviation values, the position is adjusted again. The adjustment is carried out by the cooperation of the adjustment bracket 1 and the second adjustment bracket 2, so as to ensure that the laser source can be coupled into the optical fiber with maximum efficiency from the initial installation.

[0031] The advantages of this invention are that the laser source can be adjusted in five degrees of freedom (X / Y / Rx / Ry / Rz), and the laser incident position and angle can be adjusted with high precision through the detection and adjustment of the laser source by three optical measurement mechanisms. This ensures that the laser source can be coupled into the optical fiber with maximum efficiency from the very beginning of installation, and it is widely applicable to many invisible laser application scenarios. The combination of the adjustment bracket and the detection unit can transform the complex laboratory adjustment method into an application scenario that is easy to mass-produce in industry.

[0032] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A detection device for self-calibration of a laser beam, characterized in that: It includes an adjustable adjustment bracket, a second adjustment bracket disposed at the front end of the adjustment bracket, a connecting seat mounted at the end of the second adjustment bracket, a reference mounting bracket disposed at the front end of the connecting seat, and a detection unit disposed on the reference mounting bracket. The detection unit includes a focusing lens disposed from front to back, a Brewster measurement unit for measuring the position Rz of the laser beam, a second detection unit for measuring the positions Rx and Ry of the laser beam, and a four-quadrant measurement unit for measuring the positions X and Y of the laser beam.

2. The detection device for self-calibration of a laser beam according to claim 1, characterized in that: Both the adjustment bracket and the second adjustment bracket are provided with vibration isolation plates.

3. The detection device for self-calibration of a laser beam according to claim 1, characterized in that: A light-absorbing unit is also provided at the front end of the detection unit, and a diode is also provided on the side.

4. The detection device for self-calibration of a laser beam according to claim 1, characterized in that: A shutter is also provided in front of the focusing lens.

5. The detection method of the laser beam self-calibration detection device according to claim 1, characterized in that: Specifically, the following steps are included: Installing a laser source: The laser source is positioned between the adjusting bracket and the second adjusting bracket, and is subject to the adjustment and movement of the adjusting bracket and the second adjusting bracket. The adjusting bracket and the second adjusting bracket can adjust the laser source in five degrees of freedom, namely X / Y / Rx / Ry / Rz. The laser source is first shone into the Brewster measurement unit, and the position deviation of Rz is calculated. Then, the particles are sequentially injected into the second detection unit and the four-quadrant measurement unit, and the positional deviations of X / Y / Rx / Ry are calculated. Based on the calculated deviation value, the position is adjusted again. The adjustment is achieved through the cooperation of the adjustment bracket and the second adjustment bracket, thereby ensuring that the laser source can be coupled into the optical fiber with maximum efficiency from the very beginning of the installation.

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