A detection device for the circular polarization of lasers used in drilling machines

Abstract

This utility model provides a device for detecting the circular polarization of laser light emitted from a drilling machine, relating to the field of laser polarization detection technology. The device includes a laser, a glass slide, a beam splitter, and a power detection component arranged sequentially along a first direction. The glass slide, beam splitter, and power detection component are arranged in the laser path emitted by the laser. The beam splitter allows horizontally polarized light to propagate along the first direction towards the power detection component after transmission, and causes vertically polarized light to be reflected along a second direction, with the first and second directions forming an angle. During the detection of polarized light, no additional power attenuator is needed, reducing the measurement error caused by redundant optical components. The polarization state is determined directly by detecting the ratio of transmitted and reflected light intensity, thus reducing detection costs.

Description

Technical Field

[0001] This utility model relates to the field of laser polarization detection technology, and more specifically, to a device for detecting the circular polarization of lasers used in drilling machines. Background Technology

[0002] The detection of circularly polarized light typically involves using specific optical components and techniques to distinguish circularly polarized light from linearly polarized light or natural light.

[0003] There are two main types of existing methods for detecting the circular polarization of lasers. One method involves sequentially placing a glass slide, a power attenuator, and a polarization detector along the laser beam path emitted by the laser. This method is simple to operate and has high accuracy. However, the disadvantage is that the energy of the laser changes after being attenuated by the optical device, which may change the polarization state. In addition, the polarization analyzer is relatively expensive.

[0004] Another method involves sequentially placing a glass slide, a power attenuator, a polarizer, and a CCD along the laser beam path emitted by the laser. This method can quickly determine the polarization state. Due to the characteristics of the polarizer, only light parallel to the transmission axis is allowed to pass through, while the rest of the light is absorbed or reflected. This method is suitable for low-power laser polarization detection. However, when detecting high-power lasers, adding an attenuator to the optical path may change the polarization, and CCDs are expensive, resulting in high detection costs. Utility Model Content

[0005] The purpose of this invention is to provide a detection device for the circular polarization of laser light in drilling machines. This device does not require an additional power attenuator, reduces the measurement error caused by redundant optical components, and directly determines the polarization state by detecting the ratio of transmitted and reflected light intensity, thereby reducing detection costs.

[0006] The embodiments of this utility model can be implemented as follows:

[0007] In a first aspect, this utility model provides a detection device for the circular polarization of a laser in a drilling machine, comprising a laser, a glass slide, a beam splitting assembly, and a power detection assembly arranged sequentially along a first direction;

[0008] The glass slide, beam splitter, and power detection assembly are sequentially positioned along the laser path emitted by the laser.

[0009] The beam splitter enables horizontally polarized light to propagate along a first direction toward the power detection component after transmission, and also enables vertically polarized light to be reflected along a second direction, with the first and second directions forming an angle.

[0010] In an optional embodiment, the beam splitting assembly includes a first beam splitting prism and a second beam splitting prism. Both the first and second beam splitting prisms are right-angled triangular prisms, and together they form a cubic beam splitting assembly. The three outer peripheral surfaces of the first beam splitting prism are each provided with a high-reflection coating, and the side of the first and second beam splitting prisms that are in contact with each other is coated with a polarizing beam splitting film. The three outer peripheral surfaces of the second beam splitting prism are each provided with a high-reflection coating.

[0011] In an optional implementation, the slide is a quarter slide.

[0012] In an optional embodiment, the glass slide is fixedly mounted on the rotating platform, and the rotation direction of the rotating platform is parallel to the first direction.

[0013] In an optional embodiment, a light-blocking plate is provided on one side of the beam splitter, which is used to block the light beam reflected along the second direction after passing through the beam splitter.

[0014] In an optional embodiment, the detection device for the circular polarization of the drilling machine laser further includes a beam expander, which is spaced apart from the power detection component along a first direction and located on the side of the power detection component away from the beam splitter.

[0015] In an optional embodiment, the detection device for the circular polarization of the laser in the drilling machine further includes a reflector. The reflector is spaced apart from the power detection component along a first direction and is located on the side of the power detection component away from the beam splitter. The reflector is used to reflect the polarized light transmitted through the beam splitter along a third direction, which forms an angle with the first direction.

[0016] In an optional embodiment, the detection device for the circular polarization of the drilling machine laser also includes a galvanometer located on one side of the reflector, through which the beam of light propagating in a third direction after being reflected by the reflector passes.

[0017] In an optional embodiment, the detection device for the circular polarization of the drilling machine laser also includes a field lens, which is located on the side of the galvanometer away from the reflector. The beam of light, after being reflected by the reflector, propagates in a third direction and passes through the galvanometer and the field lens in sequence.

[0018] In an optional implementation, the galvanometer is a digital galvanometer, and / or the field lens is a telecentric field lens.

[0019] The beneficial effects provided by this embodiment of the invention include: This embodiment of the invention provides a detection device for the circular polarization of a drilling machine laser, comprising a laser, a glass slide, a beam splitter, and a power detection component arranged sequentially along a first direction. The glass slide, beam splitter, and power detection component are sequentially arranged along the laser path emitted by the laser. The beam splitter enables horizontally polarized light to propagate along the first direction towards the power detection component after transmission, and enables vertically polarized light to be reflected along a second direction, with the first and second directions forming an angle. During the detection of polarized light, there is no need to add an additional power attenuator, reducing the measurement error caused by redundant optical components. The polarization state is directly determined by detecting the ratio of transmitted and reflected light intensity, which can reduce detection costs. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is one of the structural schematic diagrams of an existing laser circular polarization detection device;

[0022] Figure 2 This is the second schematic diagram of an existing laser circular polarization detection device;

[0023] Figure 3 This is a schematic diagram of the structure of the detection device for the circular polarization of laser in a drilling machine provided in this embodiment.

[0024] Icons: 1-Detection device for circular polarization of laser in drilling machine; 100-Laser; 200-Slide; 300-Beam splitter; 400-Brightness shield; 500-Power detection component; 600-Beam expander; 700-Reflector; 800-Galvanometer; 900-Field mirror. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0028] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model.

[0029] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0030] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0031] Please refer to Figure 1 In an existing laser circular polarization detection device, a glass slide, a power attenuator, and a polarization detector are sequentially arranged on the laser beam path emitted by the laser. This method is simple to operate and has high accuracy. However, the disadvantage is that the energy of the laser changes after being attenuated by the optical device, and the polarization state may change. In addition, the polarization analyzer is relatively expensive.

[0032] Please refer to Figure 2 Another existing laser circular polarization detection device arranges a glass slide, a power attenuator, a polarizer, and a CCD sequentially along the laser beam path emitted by the laser. This method can quickly determine the polarization state. Due to the characteristics of the polarizer, only light parallel to the transmission axis is allowed to pass through, while the rest of the light is absorbed or reflected. It is suitable for low-power laser polarization detection. However, when detecting high-power lasers, adding an attenuator to the optical path may change the polarization, and CCDs are expensive, resulting in high detection costs.

[0033] This utility model provides a detection device 1 for the circular polarization of lasers in drilling machines. It eliminates the need for an additional power attenuator, reduces the measurement error caused by redundant optical components, and directly determines the polarization state by detecting the ratio of transmitted and reflected light intensity, thereby reducing detection costs.

[0034] The following describes in detail, with reference to the accompanying drawings, the specific structure of a laser circular polarization detection device 1 for a drilling machine and its corresponding technical effects provided by this utility model embodiment.

[0035] Please refer to Figure 3 The present invention provides a detection device 1 for the circular polarization of a drilling machine laser, comprising a laser 100, a glass slide 200, a beam splitter 300 and a power detection component 500 arranged sequentially along a first direction, wherein the glass slide 200, the beam splitter 300 and the power detection component 500 are arranged sequentially on the laser path emitted by the laser 100.

[0036] It is understandable that the optical path of the laser emitted by laser 100 is parallel to the first direction.

[0037] The beam splitter 300 enables horizontally polarized light to propagate along a first direction toward the power detection component 500 after transmission, and enables vertically polarized light to be reflected along a second direction, with the first direction and the second direction forming an angle.

[0038] It should be noted that the beam splitting component 300 in this embodiment can polarize and split the laser emitted by the laser 100 into horizontally polarized light and vertically polarized light. The horizontally polarized light can be transmitted and then pass through the power detection component 500, while the vertically polarized light can be reflected by the beam splitting component 300 and then propagate along the second direction.

[0039] The power of horizontally polarized light can be detected by the power detection component 500 after transmission.

[0040] Optionally, after detecting the horizontally polarized light, the power detection component 500 can transfer it to the path of the vertically polarized light after reflection along the second direction. Thus, the power detection component 500 can detect the power of the vertically polarized light. It is understandable that using the same power detection component 500 for power detection can effectively reduce measurement errors.

[0041] Therefore, the detection device 1 for circular polarization of laser light in drilling machines provided by this utility model does not require an additional power attenuator during the detection of polarized light, thus reducing the measurement error caused by redundant optical components. It can directly determine the polarization state by detecting the ratio of transmitted and reflected light intensity, thereby reducing detection costs.

[0042] Optionally, the beam splitting assembly 300 in this embodiment includes a first beam splitting prism and a second beam splitting prism. Both the first and second beam splitting prisms are right-angled triangular prisms. The first and second beam splitting prisms together form a cubic beam splitting assembly 300. The three outer peripheral surfaces of the first beam splitting prism are each provided with a high anti-reflection film. The side of the first and second beam splitting prisms that are in contact with each other is coated with a polarizing beam splitting film. The three outer peripheral surfaces of the second beam splitting prism are each provided with a high anti-reflection film.

[0043] Understandably, the surfaces of the first and second beam splitters that are in contact with each other are coated with a polarizing beam splitter film and a high-reflection coating. Both the first and second beam splitters can have high-reflection coatings applied via electroplating. The high-reflection coating is used for light transmission, while the polarizing beam splitter film allows horizontally polarized light to pass through the power detection component 500. The polarizing beam splitter film also allows vertically polarized light to be reflected by the beam splitter component 300 and propagate along the second direction.

[0044] It should be noted that beam-splitter films are typically composed of multiple layers of dielectric materials or metal films. Multiple dielectric materials are achieved by depositing multiple layers of dielectric materials with different refractive indices on a glass or other substrate. Commonly used dielectric materials include titanium dioxide (TiO2), silicon dioxide (SiO2), and tantalum pentoxide (Ta2O5). These materials possess high transparency and low absorption characteristics, making them suitable for use in optical systems within specific wavelength ranges. By precisely controlling the thickness and refractive index of each layer, beam-splitter films with high reflectivity or transmittance for specific wavelengths of light can be designed to meet diverse beam-splitter requirements.

[0045] Metal films are typically made of commonly used metals, including chromium, aluminum, silver, and gold.

[0046] In this embodiment, the glass slide 200 is a quarter glass slide 200, which is used to adjust the polarization state of the light beam.

[0047] It is easy to understand that if the incident light is linearly polarized and its polarization direction is at a 45-degree angle to the fast or slow axis of the quarter-plate 200, then after passing through the quarter-plate 200, the light will become circularly polarized. This is because, in this case, the two perpendicular components of the light wave (corresponding to the fast and slow axis directions, respectively) experience different phase velocities, resulting in a phase difference of π / 2 between them, thus causing the end of the resulting electric field vector to trace a circle.

[0048] Conversely, when circularly polarized light enters the quarter-plate 200, it is converted back into linearly polarized light. This can be understood by considering circularly polarized light as two orthogonally linearly polarized components with a phase difference of π / 2. The role of the quarter-plate 200 is to cancel this phase difference, causing the two components to recombine into linearly polarized light.

[0049] Furthermore, elliptically polarized light can be generated by adjusting the angle between the direction of the incident ray-polarized light and the axis of the quarter-slide 200. The shape of the ellipse depends on the phase difference and the amplitude ratio of the two orthogonal components.

[0050] Optionally, the glass slide 200 can be fixedly mounted on a rotating platform, with the rotation direction of the platform parallel to the first direction. That is, the rotating platform can rotate the 1 / 4 glass slide 200. When the ratio of reflected light intensity to transmitted light intensity is 1:1, the light passing through the glass slide 200 is circularly polarized. This detection method has low cost and allows for observation of light intensity ratios to determine linear, circular, and elliptical polarization states. The detection method is simple and convenient.

[0051] A light-blocking plate 400 is provided on one side of the beam splitter 300. The light-blocking plate 400 is used to block the light beam reflected in the second direction after passing through the beam splitter 300. Understandably, the light-blocking plate 400 can be used to isolate the laser and protect the equipment and operators.

[0052] Understandably, after the power detection component 500 detects the horizontally polarized light, it can transfer it to the path of the vertically polarized light after reflection along the second direction. Then, the power detection component 500 can detect the power of the vertically polarized light. At this time, the light blocking plate 400 can be transferred to the optical path after the horizontally polarized light is transmitted through the beam splitter 300.

[0053] In this embodiment, the detection device 1 for the circular polarization of the laser of the drilling machine further includes a beam expander 600, which is spaced apart from the power detection component 500 along the first direction and located on the side of the power detection component 500 away from the beam splitter 300.

[0054] Understandably, the beam expander 600 can be used to change the size of the laser spot and the divergence angle to meet different needs.

[0055] In this embodiment, the detection device 1 for the circular polarization of the laser of the drilling machine further includes a reflector 700. The reflector 700 is spaced apart from the power detection component 500 along the first direction and is located on the side of the power detection component 500 away from the beam splitter 300. The reflector 700 is used to reflect the polarized light transmitted through the beam splitter 300 along a third direction, and the third direction forms an angle with the first direction.

[0056] As is easily understood, the reflector 700 is mainly used to change the propagation direction of the laser in order to reduce the size of the detection device 1 for the circular polarization of the laser used in the drilling machine in the first direction.

[0057] In this embodiment, the third direction is opposite to the second direction, and both the third direction and the second direction are perpendicular to the first direction. Of course, the perpendicularity in this embodiment should not be limited to the strict sense of perpendicularity; it is sufficient to mean approximately perpendicular.

[0058] The detection device 1 for the circular polarization detection of laser beams in drilling machines also includes a galvanometer 800, which is located on one side of the reflector 700. The beam beam that is reflected by the reflector 700 and propagates in the third direction passes through the galvanometer 800.

[0059] Optionally, the galvanometer 800 can be a digital galvanometer 800 with an incident aperture diameter of 14mm. Understandably, the digital galvanometer 800 can more precisely control the laser beam passing through the reflector 700.

[0060] The detection device 1 for the circular polarization detection of laser in a drilling machine also includes a field mirror 900, which is located on the side of the galvanometer 800 away from the reflector 700. The beam that is reflected by the reflector 700 and propagates in the third direction passes through the galvanometer 800 and the field mirror 900 in sequence.

[0061] Optionally, the field lens 900 in this embodiment is a telecentric field lens 900 with a focal length of F100, meaning the lens is designed to have a focal length of 100 mm. It is understood that a telecentric lens has a constant magnification; within a specific working distance range, a telecentric lens ensures that the magnification of an object remains consistent regardless of whether it is at the center or edge of the field of view.

[0062] In summary, this utility model provides a detection device 1 for the circular polarization of a drilling machine laser, comprising a laser 100, a glass slide 200, a beam splitter 300, and a power detection component 500 arranged sequentially along a first direction. The glass slide 200, beam splitter 300, and power detection component 500 are arranged sequentially along the laser path emitted by the laser 100. The beam splitter 300 enables horizontally polarized light to propagate along the first direction towards the power detection component 500 after transmission, and enables vertically polarized light to be reflected along a second direction, with the first and second directions forming an angle. During the detection of polarized light, there is no need to add an additional power attenuator, reducing the measurement error caused by redundant optical components. The polarization state is determined directly by detecting the ratio of transmitted and reflected light intensity, which can reduce detection costs.

[0063] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A device for detecting the circular polarization of laser light used in drilling machines, characterized in that, It includes a laser (100), a glass slide (200), a beam splitter (300), and a power detection component (500) arranged sequentially along a first direction; The glass slide (200), the beam splitter (300), and the power detection component (500) are sequentially arranged on the laser path emitted by the laser (100); The beam splitter (300) enables horizontally polarized light to propagate along the first direction toward the power detection component (500) after transmission, and enables vertically polarized light to be reflected along the second direction, wherein the first direction and the second direction form an angle.

2. The detection device for laser circular polarization of a drilling machine according to claim 1, characterized in that: The beam splitting assembly (300) includes a first beam splitting prism and a second beam splitting prism. Both the first beam splitting prism and the second beam splitting prism are right-angled triangular prisms. The first beam splitting prism and the second beam splitting prism together form a cubic beam splitting assembly (300). Each of the three outer peripheral surfaces of the first beam splitting prism is provided with a high anti-reflection film. The side of the first beam splitting prism that is in contact with the second beam splitting prism is coated with a polarizing beam splitting film. Each of the three outer peripheral surfaces of the second beam splitting prism is provided with a high anti-reflection film.

3. The detection device for laser circular polarization of a drilling machine according to claim 1, characterized in that: The glass slide (200) is a 1 / 4 glass slide (200).

4. The detection device for laser circular polarization of a drilling machine according to claim 1, characterized in that: The glass slide (200) is fixedly installed on the rotating platform, and the rotation direction of the rotating platform is parallel to the first direction.

5. The detection device for laser circular polarization of a drilling machine according to claim 1, characterized in that: A light-blocking plate (400) is provided on one side of the beam splitter (300), and the light-blocking plate (400) is used to block the light beam reflected along the second direction after passing through the beam splitter (300).

6. The detection device for laser circular polarization of a drilling machine according to claim 1, characterized in that: The detection device for the circular polarization of the laser in the drilling machine further includes a beam expander (600), which is spaced apart from the power detection component (500) along the first direction and located on the side of the power detection component (500) away from the beam splitter (300).

7. The detection device for laser circular polarization of a drilling machine according to claim 1, characterized in that: The detection device for the circular polarization of the laser in the drilling machine further includes a reflector (700), which is spaced apart from the power detection component (500) along the first direction and located on the side of the power detection component (500) away from the beam splitter (300). The reflector (700) is used to reflect the polarized light transmitted through the beam splitter (300) along a third direction, which is at an angle to the first direction.

8. The detection device for circular polarization of laser in a drilling machine according to claim 7, characterized in that: The detection device for the circular polarization of the laser in the drilling machine also includes a galvanometer (800), which is located on one side of the reflector (700). The light beam that is reflected by the reflector (700) and propagates along the third direction passes through the galvanometer (800).

9. The detection device for laser circular polarization of a drilling machine according to claim 8, characterized in that: The detection device for the circular polarization of the laser in the drilling machine also includes a field lens (900), which is located on the side of the galvanometer (800) away from the reflector (700). The beam of light that is reflected by the reflector (700) and propagates along the third direction passes through the galvanometer (800) and the field lens (900) in sequence.

10. The detection device for circular polarization of laser in a drilling machine according to claim 9, characterized in that: The galvanometer (800) is a digital galvanometer (800), and / or the field lens (900) is a telecentric field lens (900).

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