Rapid electro-optical scanning acceleration device
By combining the semi-Bruster prism with the electro-optical deflector in the electro-optical scanner, laser scanning at a large angle is achieved, the deflection angle is accelerated, and the problem of limited deflection angle of the electro-optical scanner in the prior art is solved, and the scanning effect is high flexibility, low power consumption and high precision.
Patent Information
- Application Number
- CN202510306437.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-14
- Publication Date
- 2025-07-04
AI Technical Summary
Existing laser scanners cannot realize scanning of large deflection angles, especially the electro-optical scanners have limited deflection angles, which cannot meet the needs of fast, high precision and low power consumption.
The semi-Bruster prism is combined with an electro-optical deflector. The beam is shot from the right angle face of the semi-Bruster prism and shot out from the inclined surface at the Bruster angle. The deflection acceleration in a large angle range is achieved by cascading multiple semi-Bruster prisms, and the optical path design is optimized by combining the coupler and collimator.
It realizes fast and large deflection angle scanning, accelerates laser scanning, reduces the insertion loss of the prism, and has high flexibility, low power consumption and high precision scanning effects.
Smart Images
Figure CN120255230A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of laser technology, and particularly to a fast electro-optic scanning acceleration device. Background Art
[0002] Traditional mechanical scanning technology relies on mechanical rotation and cannot achieve fast and high-precision scanning. Scanners based on laser deflection can quickly change the spatial propagation direction of the light beam within an extremely short time and are currently widely used in many fields such as lidar, laser processing, optical storage and display, optical communication, digital display, and high-speed imaging.
[0003] In related technologies, laser scanners are divided into acousto-optic and electro-optic scanners. Acousto-optic scanners often have low resolution, and are limited by diffraction efficiency with large energy loss. In addition, frequency drift may occur as the scanning speed increases. Electro-optic scanners can achieve fast, high-precision, and low-power consumption scanning by changing the electric field. However, their deflection angle is limited, and the maximum deflection angle is usually less than 10°, making it impossible to achieve large-deflection-angle scanning. Summary of the Invention
[0004] The technical problem to be solved by the present invention is to provide a fast electro-optic scanning acceleration device, aiming to solve the problem that laser scanners in related technologies cannot achieve large-deflection-angle scanning.
[0005] To solve the above technical problem, the present invention provides a fast electro-optic scanning acceleration device, including an electro-optic deflector and a semi-Brewster prism. The electro-optic deflector is used to receive a light beam and emit the deflected light beam. The right-angle surface of the semi-Brewster prism is used to receive the light beam emitted from the electro-optic deflector and make the light beam exit from the inclined surface of the semi-Brewster prism, and the exit angle of the light beam from the inclined surface of the semi-Brewster prism is the Brewster angle.
[0006] Optionally, the structure of the semi-Brewster prism is a right prism that is half of a Brewster prism, and the apex angle of the semi-Brewster prism is half of the apex angle of the Brewster prism.
[0007] Optionally, the light beam emitted from the electro-optic deflector is vertically incident on the right-angle surface of the semi-Brewster prism.
[0008] Optionally, a plurality of semi-Brewster prisms are provided and are sequentially spaced apart, and the light beam propagates from a previous semi-Brewster prism to a subsequent semi-Brewster prism;
[0009] Wherein, the light beam enters from the right-angle surface of each semi-Brewster prism and exits from the inclined surface of the semi-Brewster prism, and the exit angle of the light beam from the inclined surface of each semi-Brewster prism is the Brewster angle.
[0010] Optionally, along the arrangement direction of the semi-Brewster prism, the bottom surfaces of the semi-Brewster prisms all face the same side.
[0011] Optionally, the fast electro-optical scanning acceleration device further includes a coupler for coupling a light beam into the electro-optical deflector.
[0012] Optionally, the fast electro-optical scanning acceleration device further includes a collimator disposed between the electro-optical deflector and the semi-Brewster prism. The collimator is configured to collimate the light beam emitted from the electro-optical deflector and inject the collimated light beam into the semi-Brewster prism.
[0013] Compared with the related art, a fast electro-optical scanning acceleration device in the present invention has the beneficial effects that: by arranging a semi-Brewster prism in the electro-optical scanning acceleration device and making the light beam enter from the right-angle surface of the semi-Brewster prism and exit from the inclined surface of the semi-Brewster prism at the Brewster angle, the light beam passing through the semi-Brewster prism undergoes a large-angle range of angular deflection acceleration, so that both fast and large-deflection-angle scanning acceleration can be achieved, large-deflection-angle scanning can be realized, and the insertion loss of the prism can be effectively reduced. Description of the Drawings
[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the related art, the following will briefly introduce the drawings required for use in the description of the embodiments or the related art. Obviously, the following-described drawings are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative efforts.
[0015] Figure 1 is a schematic diagram of the fast electro-optical scanning acceleration device provided by the embodiment of the present invention.
[0016] In the drawings, each reference numeral represents: 1, electro-optical deflector; 2, right-angle prism; 21, bottom surface; 22, right-angle surface; 23, inclined surface; 4, coupler; 5, collimator. Detailed Embodiments
[0017] The following will describe in detail the embodiments of the present invention. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the scope of protection of the present invention.
[0018] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention.
[0019] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "a plurality" is two or more unless otherwise specifically defined.
[0020] Embodiment:
[0021] Please refer to Figure 1 , a fast electro-optical scanning acceleration device includes an electro-optical deflector 1 and a semi-Brewster prism 2. The electro-optical deflector 1 is used to receive a light beam and emit the deflected light beam; the right-angle surface 22 of the semi-Brewster prism 2 is used to receive the light beam emitted from the electro-optical deflector 1, and make the light beam emit from the inclined surface 23 of the semi-Brewster prism 2, and the emission angle of the light beam from the inclined surface 23 of the semi-Brewster prism 2 is the Brewster angle.
[0022] By arranging the semi-Brewster prism 2 in the electro-optical scanning acceleration device, and making the light beam enter from the right-angle surface 22 of the semi-Brewster prism 2 and emit from the inclined surface 23 of the semi-Brewster prism 2 at the Brewster angle, the light beam passing through the semi-Brewster prism 2 undergoes angular deflection acceleration in a large angular range, so that both fast scanning acceleration with a large deflection angle and scanning with a large deflection angle can be achieved, and the insertion loss of the prism can be effectively reduced.
[0023] The structure of the semi-Brewster prism 2 is a right prism that is half of a Brewster prism. The apex angle of the semi-Brewster prism 2 is half of the apex angle of the Brewster prism, that is, the semi-Brewster prism 2 can be prepared from a Brewster prism; wherein, the included angle between the inclined surface 23 of the semi-Brewster prism 2 and the right-angle surface 22 of the semi-Brewster prism 2 is the apex angle.
[0024] The light beam emitted from the electro-optical deflector 1 is vertically incident on the right-angle surface 22 of the half-Brewster prism 2, which can further reduce the insertion loss of the half-Brewster prism 2. Through reasonable optical path design, the light beam passing through the electro-optical deflector 1 is deflected at a small angle and is normally incident on the right-angle surface 22 of the half-Brewster prism 2, and the light beam transmitted through the half-Brewster prism 2 is deflected and accelerated within a large angular range.
[0025] In the present invention, the propagation of the light beam in the half-Brewster prism 2 satisfies the following conditional formula:
[0026]
[0027] θ3 = arcsin[nsin(α + θ2)], (2);
[0028] where θ1 is the incident angle when the light beam is vertically incident on the right-angle surface 22 of the half-Brewster prism 2, θ2 is the refraction angle in the crystal of the half-Brewster prism 2, θ3 is the exit angle when the light beam exits from the inclined surface 23 of the half-Brewster prism 2, α is the included angle between the inclined surface 23 of the half-Brewster prism 2 and the right-angle surface 22 of the half-Brewster prism 2, n is the refractive index of the half-Brewster prism 2, and is the deflection angle of the light beam by the electro-optical deflector 1.
[0029] The following gives an example of the large-angle deflection of the light beam by the half-Brewster prism 2:
[0030] In a specific example, the electro-optical deflector 1 introduces a maximum deflection angle to the light beam The refractive index n of the half-Brewster prism 2 is 1.5, the light beam is vertically incident on the right-angle surface 22 of the half-Brewster prism 2, that is, θ1 = 0°, the apex angle α of the half-Brewster prism 2 is 33.55°, according to the above conditional formulas (1) and (2), it is calculated that the refraction angle θ2 in the crystal of the half-Brewster prism 2 is 4.66°, and the exit angle θ3 when the light beam exits from the inclined surface 23 of the half-Brewster prism 2 is 68.1°. Compared with the case of normal incidence, the output deflection angle obtained is 1.73 times the maximum deflection angle introduced by the electro-optical deflector 1, thereby realizing the large-angle deflection of the light beam.
[0031] Please refer to Figure 1, in order to further increase the deflection angle, multiple half-Brewster prisms 2 are provided and are sequentially and spaced apart. The light beam propagates from a previous half-Brewster prism 2 to a subsequent half-Brewster prism 2. Among them, the light beam enters from the right-angle surface 22 of each half-Brewster prism 2 and exits from the inclined surface 23, and the exit angle of the light beam exiting from the inclined surface 23 of each half-Brewster prism 2 is the Brewster angle. By inserting multiple cascaded half-Brewster prisms 2 into the optical path, the deflection acceleration angle can be rapidly increased, and finally a laser scanner with high flexibility, low power consumption, fast speed, high precision, and large deflection angle can be obtained.
[0032] The following gives an example of the large-angle deflection of the light beam by multiple cascaded half-Brewster prisms 2:
[0033] In a specific example, two half-Brewster prisms 2 are provided, and the electro-optic deflector 1 introduces a maximum deflection angle to the light beam The refractive index n of the two half-Brewster prisms 2 is 1.5. The light beam is vertically incident on the right-angle surface 22 of the half-Brewster prism 2, that is, θ1 = 0°. The apex angle α of the two half-Brewster prisms 2 is 33.55°. According to the above conditional formulas (1) and (2), it is calculated that the deflection angle θ2 in the crystal of the half-Brewster prism 2 is 8.03°. The exit angle θ3 after passing through the second half-Brewster prism 2 is 84.56°. The output deflection angle obtained compared with the normal incidence is 4.08 times the maximum deflection angle introduced by the electro-optic deflector 1 so as to realize the large-angle deflection of the light beam.
[0034] It should be understood that if another half-Brewster prism 2 is added, the exit angle θ3 after passing through the third half-Brewster prism 2 will exceed 90°. Thus, in a fast electro-optic scanning acceleration device, only several cascaded half-Brewster prisms 2 need to be added to convert the small deflection angle scanning of the electro-optic deflector 1 into an accelerated scanning with a large angle deflection, so that the deflection angle of the laser scanner can be rapidly increased, and fast and high-precision large-angle range scanning acceleration can be realized.
[0035] Please refer to Figure 1 , in some embodiments, in the arrangement direction of the half-Brewster prisms 2, the bottom surfaces 21 of the half-Brewster prisms 2 all face the same side, which can make the light beams passing through each half-Brewster prism 2 deflect in the same direction, ensuring the large-angle deflection of the light beam by the fast electro-optic scanning acceleration device.
[0036] It should be understood that in the arrangement direction of the half-Brewster prisms 2, when the bottom surfaces 21 of the two half-Brewster prisms 2 face different sides, the light beam deflects in one direction when passing through one half-Brewster prism 2 and deflects in the other direction when passing through the other half-Brewster prism 2.
[0037] In some embodiments, the included angles between the inclined surfaces 23 and the right-angled surfaces 22 of each half Brewster prism 2 are the same or different. Among them, when the included angles between the inclined surfaces 23 and the right-angled surfaces 22 of each half Brewster prism 2 are the same, the angles by which each half Brewster prism 2 deflects the light beam are the same; when the included angles between the inclined surfaces 23 and the right-angled surfaces 22 of each half Brewster prism 2 are different, the angles by which each half Brewster prism 2 deflects the light beam are different.
[0038] To achieve precise adjustment of the deflection angle of the light beam, along the arrangement direction of the half Brewster prisms 2, the included angle between the inclined surface 23 and the right-angled surface 22 of the half Brewster prism 2 arranged later is smaller than the included angle between the inclined surface 23 and the right-angled surface 22 of the half Brewster prism 2 arranged earlier. Among them, along the arrangement direction of the half Brewster prisms 2, the included angles between the inclined surfaces 23 and the right-angled surfaces 22 of each half Brewster prism 2 gradually decrease.
[0039] In some embodiments, the fast electro-optical scanning acceleration device further includes a plurality of drive sources, and the plurality of drive sources are connected to the plurality of half Brewster prisms 2 one by one. The drive source is used to drive the half Brewster prism 2 to move to the first position or the second position; among them, when the half Brewster prism 2 is in the first position, the half Brewster prism 2 is located on the propagation path of the light beam, and the half Brewster prism 2 can deflect the light beam by an angle; when the half Brewster prism 2 is in the second position, the half Brewster prism 2 is away from the propagation path of the light beam, and the half Brewster prism 2 cannot deflect the light beam by an angle, so that the angle size of the light beam deflected by the fast electro-optical scanning acceleration device can be controlled in real time. Among them, the drive source can be a drive motor, and the drive motor drives the half Brewster prism 2 to move forward or backward.
[0040] It should be noted that along the arrangement direction of the half Brewster prisms 2, when the bottom surfaces 21 of a part of the half Brewster prisms 2 face one side and the bottom surfaces 21 of the other part of the half Brewster prisms 2 face the other side, the corresponding drive source can be controlled to control the corresponding half Brewster prism 2 to move to the first position or the second position, so as to adjust the overall left or right deflection of the light beam.
[0041] Please refer to Figure 1 , the fast electro-optical scanning acceleration device further includes a coupler 4. The coupler 4 is used to couple the light beam into the electro-optical deflector 1. The coupler 4 can expand the light passing aperture of the electro-optical deflector 1, so as to adapt to light beams with large spot diameters. Among them, the light source emits a laser beam in the wavelength band of 400 - 1100 nm. After being coupled by the coupler 4, the diameter of the laser beam is within the light passing aperture range of the electro-optical deflector 1.
[0042] According to actual needs, the light-transmitting aperture of the electro-optical deflector 1 is generally 2 mm, and the coupler 4 can be a confocal system composed of two lenses with different focal lengths or a zoom beam expander.
[0043] Please refer to Figure 1 , the fast electro-optical scanning acceleration device further includes a collimator 5, which is arranged between the electro-optical deflector 1 and the half-Brewster prism 2. The collimator 5 is used to collimate the light beam emitted by the electro-optical deflector 1 and inject the collimated light beam into the half-Brewster prism 2. The collimator 5 can flexibly adjust the size of the light beam by collimating the light beam.
[0044] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A fast electro-optical scanning acceleration device, characterized in that It includes an electro-optic deflector and a semi-Brewster prism. The electro-optic deflector is used to receive a light beam and emit the deflected light beam. The right-angle surface of the semi-Brewster prism is used to receive the light beam emitted from the electro-optic deflector and make the light beam emit from the inclined surface of the semi-Brewster prism, and the emission angle of the light beam emitting from the inclined surface of the semi-Brewster prism is the Brewster angle.
2. The fast electro-optical scanning acceleration device according to claim 1, characterized in that, The structure of the semi-Brewster prism is a right prism that is half of the Brewster prism, and the apex angle of the semi-Brewster prism is half of the apex angle of the Brewster prism.
3. The fast electro-optical scanning acceleration device according to claim 1, wherein The light beam emitted from the electro-optic deflector is vertically incident on the right-angle surface of the semi-Brewster prism.
4. The fast electro-optical scanning acceleration device according to claim 1, characterized in that, A plurality of the semi-Brewster prisms are provided and are sequentially spaced apart, and the light beam propagates from a previous semi-Brewster prism to a subsequent semi-Brewster prism; Wherein, the light beam enters from the right-angle surface of each semi-Brewster prism and emits from the inclined surface of the semi-Brewster prism, and the emission angle of the light beam emitting from the inclined surface of each semi-Brewster prism is the Brewster angle.
5. The fast electro-optical scanning acceleration device according to claim 4, characterized in that, In the arrangement direction of the semi-Brewster prisms, the bottom surfaces of the semi-Brewster prisms all face the same side.
6. The fast electro-optical scanning acceleration device according to claim 1, characterized in that, The fast electro-optic scanning acceleration device further includes a coupler, and the coupler is used to couple the light beam into the electro-optic deflector.
7. The fast electro-optical scanning acceleration device according to claim 1, wherein The fast electro-optic scanning acceleration device further includes a collimator. The collimator is arranged between the electro-optic deflector and the semi-Brewster prism, and the collimator is used to collimate the light beam emitted from the electro-optic deflector and inject the collimated light beam into the semi-Brewster prism.