Laser dazzling compact type laser beam combining device
By adopting a compact laser beam combining device in laser glare, and using technologies such as polarization spectroscopic cube and multi-chip packaged array semiconductor lasers, the problems of insufficient operating distance and light source brightness of the existing laser glare are solved, and the effects of optical power increase and device volume reduction are achieved.
Patent Information
- Application Number
- CN202311718206.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-14
- Publication Date
- 2025-06-17
AI Technical Summary
The effective distance of existing laser glare devices is generally no more than 100 meters, which cannot pose a threat to long-distance targets, and the brightness of the light source is not enough to meet the application needs of longer-distance distances.
Using a compact laser beam combination device, the polarization spectrometer is used to polarize the beam combination of two sets of array laser beams to increase the optical power and maintain the beam quality. Combined with a multi-chip packaged array semiconductor laser or a TO packaged single-tube semiconductor laser, beam modulation is used using aspherical collimator lens and step prism.
Without changing the quality of the laser beam, the optical power is doubled, which effectively improves the brightness of the light source, extends the working distance, and reduces the device volume through a compact structure and reduces the cost.
Smart Images
Figure CN120161626A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a laser dazzler, and in particular, to a compact laser beam combining device for laser dazzling. Background Art
[0002] In the field of security, non-lethal weapons have been widely used. Among them, laser deterrence weapons are a kind of equipment with high efficiency and good controllability. When a laser beam irradiates the human eye, it can instantly incapacitate the target. Such laser deterrence weapons are collectively referred to as laser dazzler devices. The working principle of the laser dazzler device is based on the laser beam in the human eye's visually sensitive band. At a certain optical power, the action distance and the laser power density can be continuously adjusted within a given range through a zoom lens, and strong light stimulation is applied to the hostile targets within a certain range, causing temporary blindness without causing irreversible damage.
[0003] The photobiological effect when the laser irradiates the human eye to cause dazzle is mainly the photochemical effect. According to the absorption characteristics of the retina, lasers in the spectral region of 400 - 1400 nm can damage the retina, so this spectral region is regarded as the "retinal damage zone". And in the damage zone, according to the human eye visual efficiency function, whether under the condition of light adaptation or dark adaptation, the retina is most sensitive to the green light band and is most likely to cause the "bleaching" of the retinal photoreceptor cells. Therefore, the laser dazzler device usually uses green laser as the light source.
[0004] Most of the currently reported laser dazzlers use green semiconductor lasers with a power of hundreds of milliwatts or watts as the light source, and their effective action distance generally does not exceed 100 meters, and they cannot pose a threat to targets at a long distance. To meet the application requirements at a farther distance, it is necessary to improve the brightness of the laser light source. Summary of the Invention
[0005] The purpose of the present invention is to solve the problems in the prior art and provide a new type of compact laser beam combining device for laser dazzling.
[0006] To achieve the above object, a technical solution provided by the present invention is: a compact laser beam combining device for laser dazzling, comprising: a first laser module, a half-wave plate, a third right-angle stepped prism, a second laser module arranged in sequence along a first horizontal row, and an optical fiber, a focusing lens, a diaphragm, a polarization beam splitting cube, a fourth right-angle stepped prism arranged in sequence along a second horizontal row. The first laser module has a first laser and a first right-angle stepped prism. The first set of array laser beams provided by the first laser pass through the first right-angle stepped prism, the half-wave plate, and the third right-angle stepped prism to reach the polarization beam splitting cube. The second laser module has a second laser and a second right-angle stepped prism. The second set of array laser beams provided by the second laser pass through the second right-angle stepped prism and the fourth right-angle stepped prism to reach the polarization beam splitting cube. The polarization beam splitting cube combines the first set of array laser beams and the second set of array laser beams, and the combined beam passes through the diaphragm and the focusing lens to reach the optical fiber.
[0007] As a preferred solution of the compact laser beam combining device for laser dazzling, the first laser emits light upward, and there is the first right-angle stepped prism above the first laser. The incident surface of the first laser with respect to the first right-angle stepped prism, the exit surface of the first right-angle stepped prism with respect to the incident surface of the half-wave plate, the exit surface of the half-wave plate with respect to the incident surface of the third right-angle stepped prism, the exit surface of the third right-angle stepped prism with respect to the first incident surface of the polarization beam splitting cube, the second laser emits light upward, and there is the second right-angle stepped prism above the second laser. The incident surface of the second laser with respect to the second right-angle stepped prism, the exit surface of the second right-angle stepped prism with respect to the incident surface of the fourth right-angle stepped prism, the exit surface of the fourth right-angle stepped prism with respect to the second incident surface of the polarization beam splitting cube, the exit surface of the polarization beam splitting cube with respect to the incident surface of the diaphragm, the exit surface of the diaphragm with respect to the incident surface of the focusing lens, and the exit surface of the focusing lens with respect to the optical fiber.
[0008] As a preferred solution of the compact laser beam combining device for laser dazzling, the laser is selected from a multi-chip packaged array semiconductor laser or a TO-packaged single-tube semiconductor laser.
[0009] As a preferred solution of the compact laser beam combining device for laser dazzling, an aspheric collimating lens is packaged at the light exit of the laser.
[0010] As a preferred solution of the compact laser beam combining device for laser dazzling, the right-angle surfaces of the first right-angle stepped prism, the second right-angle stepped prism, the third right-angle stepped prism, and the fourth right-angle stepped prism are coated with a visible light antireflection film.
[0011] As a preferred solution for a compact laser beam combining device for laser dazzle, the half-wave plate is selected from a zero-order wave plate or a multi-order wave plate.
[0012] As a preferred solution for a compact laser beam combining device for laser dazzle, the focusing lens is selected from an aspherical focusing lens, a doublet lens or a triplet lens group.
[0013] Compared with the prior art, the beneficial effects of the present invention are at least as follows: 1. By using a polarization beam splitting cube to perform polarization beam combination on two groups of array laser beams, when the sizes and powers of the two groups of array laser beams are the same, the optical power can be doubled without changing the laser beam quality; 2. The structure is compact, effectively reducing the device volume, enhancing the light source brightness, improving the assembly efficiency and reducing the cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 is a three-dimensional structure diagram of the present invention.
[0015] Figure 2 is a front view of the structure of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0016] The present invention will be further described in detail below with reference to the accompanying drawings through specific embodiments. It should be noted here that the description of these embodiments is for helping to understand the present invention, but does not constitute a limitation to the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0017] Refer to Figures 1 to 2 , which shows a compact laser beam combining device for laser dazzle.
[0018] The compact laser beam combining device includes: a device housing 1. The device housing 1 has a housing bottom wall, a housing top wall, a housing peripheral wall and a housing internal space defined by the housing bottom wall, the housing top wall and the housing peripheral wall. In the housing internal space, there are a first laser module 2, a half-wave plate 3, a third right-angle stepped prism 4, a second laser module 5 arranged in sequence along a first horizontal row, and a focusing lens 6, a diaphragm 7, a polarization beam splitting cube 8, a fourth right-angle stepped prism 9 arranged in sequence along a second horizontal row. Among them, the first laser module 2 and the focusing lens 6 are in the same vertical column, the third right-angle stepped prism 4 and the polarization beam splitting cube 8 are in the same vertical column, and the second laser module 5 and the fourth right-angle stepped prism 9 are in the same vertical column.
[0019] The first laser module 2 has a first laser 21 and a first right-angled stepped prism 22 located above the first laser 21. The first laser 21 emits light upward. The first laser 21 is relative to the incident surface of the first right-angled stepped prism 22. The exit surface of the first right-angled stepped prism 22 is relative to the incident surface of the half-wave plate 3. The exit surface of the half-wave plate 3 is relative to the incident surface of the third right-angled stepped prism 4. The exit surface of the third right-angled stepped prism 4 is relative to the first incident surface of the polarization beam splitting cube 8. The second laser module 5 has a second laser 51 and a second right-angled stepped prism 52 located above the second laser 51. The second laser 51 emits light upward. The second laser 51 is relative to the incident surface of the second right-angled stepped prism 52. The exit surface of the second right-angled stepped prism 52 is relative to the incident surface of the fourth right-angled stepped prism 9. The exit surface of the fourth right-angled stepped prism 9 is relative to the second incident surface of the polarization beam splitting cube 8. The exit surface of the polarization beam splitting cube 8 is relative to the incident surface of the aperture 7. The exit surface of the aperture 7 is relative to the incident surface of the focusing lens 6. The exit surface of the focusing lens 6 is relative to the optical fiber 10.
[0020] The first group of laser arrays provided by the first laser 21 is reflected by the first right-angled stepped prism 22 and then turns to propagate in the negative Y-axis direction. At the same time, the first right-angled stepped prism 22 has a step in the Z-axis direction, and the width of the step plane depends on the row spacing of the array laser beams. After being reflected by the inner surface of the step, the row spacing of the array laser beams will be compressed.
[0021] The half-wave plate 3 is placed in front of the first group of array laser beams reflected by the first right-angled stepped prism 22. The optical axis direction of the half-wave plate 3 forms an angle of 45° with the X-axis direction. Before the first group of array laser beams passes through the half-wave plate 3, its polarization direction is along the X-axis direction. After passing through the half-wave plate 3, the polarization direction will be symmetric about the optical axis direction of the half-wave plate 3. Therefore, its polarization direction deflects 90° along the Y-axis. Preferably, the half-wave plate can be a zero-order wave plate or a multi-order wave plate.
[0022] The first group of array laser beams after passing through the half-wave plate 3 is reflected by the third right-angled stepped prism 4. After reflection, the column spacing of the first group of array laser beams will be compressed, and at the same time, the propagation direction deflects 90° and points to the X-axis direction. At this time, the laser beams emitted by the first laser module 2 are compressed both transversely and longitudinally.
[0023] The polarization beam splitting cube 8 adapts to the spot size of the laser beams compressed by the third stepped prism 4 and the fourth right-angled stepped prism 9. The bonding surface of the polarization beam splitting cube 8 forms an angle of 45° with the negative X-axis direction. The polarization direction of the first group of array laser beams is along the Z-axis when reaching the bonding surface. Therefore, it is the S light and will be reflected by the bonding surface and propagate along the positive X-axis direction.
[0024] The second set of array laser beams provided by the second laser 51 are totally reflected by the second right-angled stepped prism 52 and the fourth right-angled stepped prism 9. After the second right-angled stepped prism 52 and the fourth right-angled stepped prism 9 compress the second set of array laser beams in the transverse and longitudinal directions, the second set of array laser beams reach the second incident surface of the polarization beam splitter cube 8 along the X direction. At this time, the polarization direction of the second set of array laser beams is parallel to the Y axis. Relative to the glued surface, the light beam is a P light and will directly pass through the glued surface and overlap with the first set of array laser beams.
[0025] The aperture stop 7 is used to filter out redundant light spots. The light-transmitting aperture of the aperture stop 7 must be adapted to the parameters of the optical fiber 10. After the combined square laser beam passes through the aperture stop 74, the light spots at the four corners will be filtered out.
[0026] The focusing lens 6 is used to focus and couple the combined array light beam into the optical fiber 10. The focusing lens 6 can be an aspherical focusing lens, a doublet lens or a triplet lens group. The convex surface of the lens faces the combined light spot to reduce aberration, and the focusing lens is arranged in the lens fixture.
[0027] The optical fiber 10 is used for the conduction and preliminary shaping of the laser beam. The optical fiber 10 is installed in the optical fiber flange 11, and the optical fiber flange 11 is placed on the outer wall of the device housing 1 by an adhesive method. The combined laser beam is converged by the focusing lens 6 and then enters the core of the optical fiber 10. After propagating through total internal reflection in the optical fiber, it is preliminarily shaped into a circular light spot.
[0028] Preferably, the first laser 21 and the second laser 51 are multi-chip packaged array semiconductor laser modules or TO-packaged single-tube semiconductor laser modules. An aspherical collimating lens is packaged at the light-emitting port of the laser to collimate the light beam emitted by the semiconductor laser into an array of parallel-emitting laser beams, and a stepped prism can be used to rearrange the light beam.
[0029] Preferably, the right-angled surfaces of the first right-angled stepped prism 22, the second right-angled stepped prism 52, the third right-angled stepped prism 4 and the fourth right-angled stepped prism 9 are coated with a visible light antireflection film to reduce the Fresnel loss of the light beam on the surface.
[0030] The above only expresses the embodiments of the present invention, and the description is relatively specific and detailed, but it cannot be understood as a limitation to the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.
Claims
1. A compact laser beam combining device for laser dazzling, characterized in that, Including: A first laser module, a half-wave plate, a third right-angle stepped prism, a second laser module arranged in sequence along a first horizontal row, and an optical fiber, a focusing lens, a diaphragm, a polarization beam splitter cube, a fourth right-angle stepped prism arranged in sequence along a second horizontal row. The first laser module has a first laser and a first right-angle stepped prism. The first set of array laser beams provided by the first laser pass through the first right-angle stepped prism, the half-wave plate, and the third right-angle stepped prism to reach the polarization beam splitter cube. The second laser module has a second laser and a second right-angle stepped prism. The second set of array laser beams provided by the second laser pass through the second right-angle stepped prism and the fourth right-angle stepped prism to reach the polarization beam splitter cube. The polarization beam splitter cube combines the first set of array laser beams and the second set of array laser beams, and the combined beam passes through the diaphragm and the focusing lens to reach the optical fiber.
2. The compact laser beam combining device for laser dazzling according to claim 1, characterized in that, The first laser emits light upward. There is the first right-angle stepped prism above the first laser. The incident surface of the first laser with respect to the first right-angle stepped prism, the exit surface of the first right-angle stepped prism with respect to the incident surface of the half-wave plate, the exit surface of the half-wave plate with respect to the incident surface of the third right-angle stepped prism, the exit surface of the third right-angle stepped prism with respect to the first incident surface of the polarization beam splitter cube. The second laser emits light upward. There is the second right-angle stepped prism above the second laser. The incident surface of the second laser with respect to the second right-angle stepped prism, the exit surface of the second right-angle stepped prism with respect to the incident surface of the fourth right-angle stepped prism, the exit surface of the fourth right-angle stepped prism with respect to the second incident surface of the polarization beam splitter cube. The exit surface of the polarization beam splitter cube with respect to the incident surface of the diaphragm, the exit surface of the diaphragm with respect to the incident surface of the focusing lens, the exit surface of the focusing lens with respect to the optical fiber.
3. The compact laser beam combining device for laser dazzling according to claim 1, characterized in that, The laser is selected from a multi-chip packaged array semiconductor laser or a TO-packaged single-tube semiconductor laser.
4. The compact laser beam combining device for laser dazzling according to claim 3, characterized in that, An aspherical collimating lens is packaged at the light exit of the laser.
5. The compact laser beam combining device for laser dazzling according to claim 1, characterized in that, The right-angle surfaces of the first right-angle stepped prism, the second right-angle stepped prism, the third right-angle stepped prism, and the fourth right-angle stepped prism are coated with a visible light antireflection film.
6. The compact laser beam combining device for laser dazzling according to claim 1, characterized in that, The half-wave plate is selected from a zero-order wave plate or a multi-order wave plate.
7. The compact laser beam combining device for laser dazzling according to claim 1, characterized in that, The focusing lens is selected from an aspherical focusing lens, a doublet lens, or a triplet lens group.