A laser polarized emission instrument with a multi-wave plate encoding system

Abstract

The application discloses a laser polarization emission instrument with a multi-wave plate encoding system, comprising a laser, a plano-concave lens and a multi-wave plate encoding group arranged in sequence, wherein the multi-wave plate encoding group comprises a polarizer, a quarter-wave plate, a half-wave plate and a quarter-wave plate arranged in sequence, wherein the polarizer and the quarter-wave plate are coaxial, and the half-wave plate is arranged at a position covering half of a light field, and the application optimizes a traditional polarization encoding mode and realizes polarization control without using an electro-optic crystal.

Description

Technical Field

[0001] The invention relates to a laser polarization transmitter with a multi-wave plate coding system. Background Art

[0002] In the context of modern warfare, technological revolutions have brought about a qualitative shift in the level of warfare. Driven by the development of high-tech and cutting-edge weaponry, a mechanized and intelligent warfare model, characterized by electromechanical and electrical technologies, has essentially taken shape. The goal of warfare has shifted from annihilating the enemy to paralyzing it. Priority is given to striking high-value enemy targets, preventing them from organizing effective combat operations. The emphasis is on disrupting networks and paralyzing the enemy's entire system through point-segment chain attacks, aiming to operate within the enemy's decision-making cycle. The focus has shifted from destroying large troop groups to destroying combat systems. Against this backdrop, precision-guided weapons, particularly smart bullets, capable of effectively striking high-value targets have garnered widespread attention. In 2012, Sandia National Laboratories in the United States conducted a test firing of a smart bullet, which automatically adjusted its trajectory 30 times after launch, with a deviation of only 0.2 meters per kilometer. Therefore, in this context, we should track advanced technologies, focus on breakthroughs, and develop our own precision-guided weapons. While conventional guidance methods are gradually maturing, achieving guidance within the size of a bullet still presents numerous challenges.

[0003] Laser beam riding guidance is one of the core technologies of intelligent weapon systems. The purpose of making a principle prototype is to verify the feasibility of applying laser beam riding in intelligent and agile weapon systems, provide a solid foundation for subsequent research, and complete the feasibility demonstration of the system is the purpose of the invention. Summary of the Invention

[0004] In order to solve the above problems existing in the prior art, the present invention proposes a laser polarization multi-wave plate transmitter.

[0005] The present invention can be implemented through the following technical solutions:

[0006] A laser polarization transmitter with a multi-wave plate coding system includes a laser, a plano-concave lens and a multi-wave plate coding group arranged in sequence, wherein the multi-wave plate coding group includes a polarizer, a quarter-wave plate, a half-wave plate and a quarter-wave plate placed in sequence, wherein the polarizer and the quarter-wave plate have the same axis, and the half-wave plate is placed in a position to cover half of the light field.

[0007] Furthermore, there are two or more quarter-wave plates, which are arranged at intervals.

[0008] Furthermore, the laser beam first passes through a polarizer to become linearly polarized light, then passes through a quarter-wave plate to become elliptically polarized light, and then half of the light passes through the half-wave plate to change the direction of the elliptically polarized light, while the other half of the light does not pass through the half-wave plate. Then, the entire beam passes through the quarter-wave plate to become linearly polarized light, thereby generating two polarized lights with different directions in the emitted beam.

[0009] Furthermore, a polarizer is placed at the receiving end. When receiving polarized light of different directions at the same time, the angle of the polarizer is adjusted so that the light beam on one side can pass completely through, while the light beam on the other side cannot pass completely due to the different directions. Finally, the light field passing through the polarizer is in a bright and dark state, and the receiving end makes a position judgment based on the ratio of light to dark.

[0010] Compared with the existing chopping laser beam-riding guidance system, the laser polarization transmitter with a multi-wave plate laser encoding and decoding system provided by the present invention has the following advantages:

[0011] 1. Improvements to laser polarization encoding and decoding provide the accuracy required for precision-guided weapons;

[0012] 2. Under this polarization encoding and decoding mode, the laser polarization transmitter eliminates the electro-optical crystals and supporting voltage-stabilized power supply equipment used in the laser polarization system under the existing technology, greatly reducing the size and load of the system, and providing a lightweight and effective precision weapon guidance solution;

[0013] 3. The direction of polarized light in the light field can be changed by rotating the graduated mirror group on which the quarter-wave plate is installed, which can improve the anti-interference ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the optical path structure of the present invention;

[0015] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0016] Figure 3 Schematic diagram of the polarized light beam emitted by the transmitter.

[0017] In the picture

[0018] 1-Laser, 2-Plano-concave lens, 3-Polarizer, 4-Quarter-wave plate, 5-Half-wave plate, 6-Polarized light of half-wave plate film, 7-Polarized light beam that has not passed through half-wave plate film. DETAILED DESCRIPTION

[0019] The following describes the embodiments of the present invention through specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0020] As Figure 1 shown, the present application provides a laser polarization emitter with a multi-wave plate laser encoding and decoding system, which comprises, in sequence, a laser 1, a plano-concave lens 2, a polarizer 3, a quarter wave plate 4, a half wave plate 5, and another quarter wave plate 4. The polarizer 3 and the quarter wave plate 4 are placed on the same axis, and the half wave plate 5 is placed to cover the left half of the light field. The quarter wave plate is two or more than two, and is arranged at intervals.

[0021] As Figure 1 shown, the light beam of the laser first passes through the polarizer 3 and becomes linearly polarized light, then passes through the quarter wave plate 4 and becomes elliptically polarized light, then half of the light passes through the half wave plate 5 and changes the direction of the elliptically polarized light, and the other half of the light does not pass through the half wave plate. Then the whole light beam passes through the quarter wave plate 4 again and becomes linearly polarized light. In this way, two different direction polarized lights are generated in the emitted light beam (the directions of the two polarized lights are not perpendicular to each other). A polarizer is placed at the receiving end, and when different direction polarized lights are received, the angle of the polarizer is adjusted so that one side of the light beam can pass through completely, and the other side of the light beam cannot pass through completely due to the different direction. Finally, the light field passing through the polarizer is in a bright-dark phenomenon, and the receiving end can determine the position according to the bright-dark ratio.

[0022] When the device is installed, first fix the laser; install the plano-concave lens on the lens seat, then place it in the first installation slot of the device (close to the laser end); install the polarizer on the graduated lens seat, then place it in the second installation slot of the device, and adjust the angle to make the brightness of the passing laser beam maximum; install the quarter wave plate on the graduated lens seat and place it in the third and fifth installation slots of the device respectively; install the half wave plate film between the two clamps and fix it, and place it in the fourth installation slot of the device; when testing the optical path, let the light beam pass through the additional polarizer, adjust the rotation angle of the graduated lens seat of the third and fifth installation slots, and observe the light field passing through the polarizer to achieve the desired light field effect.

[0023] Figure 2 It is a schematic diagram of the overall structure. The polarizer 3 and the quarter wave plate 4 are installed on the graduated lens seat, and the direction of the polarized light can be changed by adjusting the angle. The half wave plate 5 is fixed by two clamps, and the half wave plate only covers half of the light aperture. The positions where the graduated lens seat and the clamps are installed have designed limiting grooves to prevent front and back shaking.

[0024] Figure 3 It is a schematic diagram of the polarized light beam emitted by the emitter, wherein 1 is the laser, 6 is the polarized light beam passing through the half wave plate film, and 7 is the polarized light beam not passing through the half wave plate film.

[0025] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A laser polarization transmitter with a multi-wave plate coding system, characterized in that: The invention comprises a laser, a plano-concave lens and a multi-wave plate encoding group arranged in sequence, wherein the multi-wave plate encoding group comprises a polarizer, a quarter-wave plate, a half-wave plate and a quarter-wave plate placed in sequence, wherein the polarizer and the quarter-wave plate are on the same axis, and the half-wave plate is placed so as to cover half of the light field; the quarter-wave plates are two or more and are arranged at intervals; the laser beam first passes through the polarizer to become linearly polarized light, and then passes through the quarter-wave plate to become elliptically polarized light, and then the light in half of the area passes through the half-wave plate to change the direction of the elliptically polarized light, and the light in the other half of the area does not pass through the half-wave plate, and then the entire light beam passes through the quarter-wave plate to become linearly polarized light, thereby generating two polarized lights with different directions in the emitted light beam.

2. The laser polarization transmitter with a multi-wave plate coding system according to claim 1, characterized in that: A polarizer is placed at the receiving end. When receiving polarized light of different directions at the same time, the angle of the polarizer is adjusted so that the light beam on one side can pass completely through, while the light beam on the other side cannot pass completely due to the different directions. Finally, the light field passing through the polarizer is in a state of bright and dark. The receiving end makes a position judgment based on the ratio of light to dark.

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