Partial coherent light coherence degree regulation and control detection device
By using a laser and a coherence control device, precise control of the spatial and temporal coherence of the laser beam is achieved, solving the problems of speckle effect and atmospheric turbulence interference in traditional laser sources, and providing a high-resolution coherence management tool.
Patent Information
- Application Number
- CN202520796672.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-25
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-04-25
AI Technical Summary
The high coherence of traditional laser sources can easily lead to speckle effects and atmospheric turbulence interference. Existing control methods lack a time-space coherence coordination control mechanism and cannot achieve programmed automatic control.
The device employs a laser, beam expander, phase modulator, convex lens, rotating scattering plate, beam splitter, and CCD camera. The controller enables precise control of the spatial and temporal coherence of the beam, and the guide rail slide and grating ruler are used for precise position detection, thereby achieving synchronous acquisition and automatic control of spatiotemporal coherence parameters.
It achieves high-resolution control of beam coherence, avoids systematic errors, provides tools for dynamic coherence management, and improves the control resolution by about an order of magnitude, adapting to the needs of precision optical systems in complex scenarios.
Smart Images
Figure CN223955896U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of beam transmission conversion, specifically to a partial coherent light coherence degree regulation and control detection device. BACKGROUND
[0002] Traditional laser light source has high monochromaticity, high directionality and other advantages, and its space-time coherence directly affects the imaging quality and communication reliability as the basic property of light field. However, there is no absolutely completely coherent light or completely incoherent light in fact, and they all belong to partial coherent light field. The light beam emitted by the laser used in the laboratory is regarded as completely coherent light, and the sunlight and incandescent lamp light in daily life are considered as completely incoherent light.
[0003] The prior art has the following disadvantages: (1) high coherence of laser easily causes speckle effect and atmospheric turbulence interference, resulting in uneven light intensity and signal distortion; (2) traditional regulation means focuses on single dimension of spatial coherence, lacking of cooperative regulation mechanism of time-space coherence; (3) existing device relies on manual adjustment of discrete elements, and cannot realize programmed automatic control, which is difficult to meet the adaptability requirement of complex scenes for precise optical system. UTILITY MODEL CONTENT
[0004] The technical problem to be solved by the utility model is to overcome the defects of the prior art, and provide a partial coherent light coherence degree regulation and control detection device, which can effectively solve the problems in the background art.
[0005] In order to achieve the above purpose, the utility model discloses a partial coherent light coherence degree regulation and control detection device, which adopts the technical scheme that a laser is arranged, a beam expander is arranged on the right side of the laser, a phase modulator is arranged on the right side of the beam expander, a convex lens one is arranged on the right side of the phase modulator, a focal length adjusting mechanism is arranged on the right side of the convex lens one, a rotating scattering plate is arranged on the right side of the focal length adjusting mechanism, a convex lens three is arranged on the right side of the rotating scattering plate, a beam splitter one is arranged on the right side of the convex lens three, a double-slit plate is arranged on the rear side of the beam splitter one, a narrow-band filter is arranged between the beam splitter one and the double-slit plate, a CCD camera one is arranged on the rear of the double-slit plate, so as to measure spatial coherence, a time-coherent light detection mechanism is arranged on the right side of the beam splitter one, a controller is arranged on the outer side of the partial coherent light coherence degree regulation and control detection device, a microprocessor is arranged in the controller, and the controller, the laser, the phase modulator, the focal length adjusting mechanism, the rotating scattering plate, the CCD camera one, the time-coherent light detection mechanism and a computer are electrically connected.
[0006] As a preferred technical scheme of the utility model, the focal length adjusting mechanism comprises a convex lens two, a guide rail sliding table one is connected below the convex lens two, the guide rail sliding table one is electrically connected with the controller, the position of the convex lens two on the guide rail sliding table one can be controlled through the computer and program, so as to adjust the focal length of laser.
[0007] As a preferred technical scheme of the utility model, grating ruler is arranged between the guide rail sliding table one and the convex lens two, the grating ruler is electrically connected with the controller, the grating ruler is used to more accurately detect the position of the convex lens two on the guide rail sliding table one, thereby more accurately control the size of the light spot on the ground glass, further more accurately control the spatial coherence of light beam, and position signal is transmitted to the computer through the controller.
[0008] As a preferred technical scheme of the utility model, the rotating scattering plate includes ground glass, the ground glass is provided with motor, the motor is connected with base below, and the motor is electrically connected with the controller. The rotating speed of the motor can be controlled by the computer.
[0009] As a preferred technical scheme of the utility model, the time coherence light detection mechanism includes beam splitter two, the beam splitter two is located at the right side of the beam splitter one, the beam splitter two is provided with mirror one behind, the beam splitter two is provided with convex lens four on the other side, the convex lens four is provided with CCD camera two in front, the CCD camera two is electrically connected with the controller, and the beam splitter two is used to disperse laser into two beams, one is shot to the mirror one, and the other is shot to mirror two.
[0010] As a preferred technical scheme of the utility model, the mirror two is arranged at the right side of the beam splitter two, the guide rail sliding table two is connected below the mirror two, the guide rail sliding table two is electrically connected with the controller, the position of the mirror two on the guide rail sliding table two is adjusted, thereby the optical path difference of two beams is controlled, interference fringes are generated to two beams, thereby time coherence is measured.
[0011] Compared with the prior art, the utility model has the advantages that: the utility model more accurately controls the light spot size of laser on the rotating ground glass through the convex lens two, the grating ruler and the guide rail sliding table one, thereby controls the spatial coherence of light beam, realizes the active control of light beam time coherence through the phase modulator for phase disturbance to light beam and changes the light wave spectrum structure, realizes the synchronous acquisition of time and space coherence parameters through the beam splitter one for simultaneously introducing output light into the time coherence light detection mechanism and the double slit plate, and the CCD camera one and the CCD camera two. The system realizes the real-time decoupling control and joint measurement of the time and space coherence of partially coherent light, provides a new tool for dynamic coherence management in atmospheric channel transmission, laser processing and other applications. Compared with the traditional scheme, the control resolution is improved by about one order of magnitude, and the system error introduced by time-sharing measurement is avoided. BRIEF DESCRIPTION OF DRAWINGS
[0012] Fig. 1A structure schematic view of the utility model;
[0013] Fig. 2 A circuit schematic view of the utility model.
[0014] In the drawing: 1, laser; 2, beam expander; 3, phase modulator; 4, convex lens one; 5, convex lens two; 501, guide rail sliding table one; 6, frosted glass; 601, motor; 602, base; 7, convex lens three; 8, beam splitter one; 9, narrowband filter; 10, CCD camera one; 11, beam splitter two; 12, convex lens four; 13, CCD camera two; 14, reflector one; 15, reflector two; 1501, guide rail sliding table two; 16, computer; 17, double-slit plate; 18, controller; 19, grating ruler. DETAILED DESCRIPTION
[0015] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model. Embodiment 1
[0016] As Figs. 1-2The utility model discloses a kind of partial coherent light coherence degree regulation and control detection devices, the technical solutions used are, including laser 1, laser 1 right side has beam expander 2, beam expander 2 right side has phase modulator 3, phase modulator 3 right side has convex lens one 4, convex lens one 4 right side has focal segment adjusting mechanism, focal segment adjusting mechanism includes convex lens two 5, convex lens two 5 below connection guide rail sliding table one 501, there is grating ruler 19 between guide rail sliding table one 501 and convex lens two 5, grating ruler 19 and controller 18 are electrically connected, guide rail sliding table one 501 and controller 18 are electrically connected, convex lens two 5 right side has rotating scattering plate, rotating scattering plate includes frosted glass 6, there is motor 601 on frosted glass 6, motor 601 below connection base 602, motor 601 and controller 18 are electrically connected, rotating scattering plate right side has convex lens three 7, convex lens three 7 is located at the focal plane of frosted glass 6, convex lens three 7 right side has beam splitter one 8, beam splitter one 8 rear side has double-slit plate 17, there is narrow-band filter 9 between beam splitter one 8 and double-slit plate 17, double-slit plate 17 rear has CCD camera one 10, beam splitter one 8 right side has time coherent light detection mechanism, time coherent light detection mechanism includes beam splitter two 11, beam splitter two 11 is located at the right side of beam splitter one 8, there is mirror one 14 behind beam splitter two 11, one side of beam splitter two 11 has convex lens four 12, there is CCD camera two 13 in front of convex lens four 12, CCD camera two 13 and controller 18 are electrically connected, beam splitter two 11 right side has mirror two 15, mirror two 15 below connection guide rail sliding table two 1501, guide rail sliding table two 1501 and controller 18 are electrically connected, one kind of partial coherent light coherence degree regulation and control detection device outside has controller 18, there is microprocessor in controller 18, controller 18 and laser 1, phase modulator 3, CCD camera one 10, computer 16 are electrically connected.
[0017] The utility model discloses a working principle: when needing to carry out the coherence degree detection, through computer 16 control laser 1 opens, and the light beam hits into phase modulator 3 after the light beam through beam expander 2 expansion, through the control of computer 16 to phase modulator 3, can realize the regulation and control of light beam time coherence degree, then the light beam hits into convex lens 1, and the light beam is hit on the frosted glass 6 through convex lens 2 refraction, through computer 16 can control the position of convex lens 2 on guide rail sliding table one 501, to control the spot size of light beam on frosted glass 6, thereby control the spatial coherence of light beam, grating ruler 19 is used for detecting the distance between convex lens 2 and frosted glass 6, then the light beam passes through frosted glass 6 and hits on convex lens three 7, and convex lens three 7 collimates the light beam, at this moment, the light beam modulation is time coherence degree and spatial coherence controllable light beam, when measuring, beam splitter one 8 divides the light beam into light beam A and light beam B, and light beam A passes through narrowband filter 9 and double-slit plate 17, and is photographed by CCD camera one 10 and is transmitted to computer 16, and narrowband filter 9 is used to improve the time coherence of light beam, avoids the influence of time coherence on interference fringe contrast, and then the light and dark contrast of interference fringe of light beam is compared and analyzed, and the spatial coherence of light beam can be measured, light beam B enters beam splitter two 11, and beam splitter two 11 divides light beam B into light beam C and light beam D, light beam C is reflected by irradiating on mirror one 14, then penetrates convex lens four 12 and is photographed by CCD camera two 13, and light beam D is reflected by irradiating on mirror two 15, and meets light beam C at convex lens four 12, thereby being photographed by CCD camera two 13, the optical path difference between light beam C and light beam D can be controlled by controlling guide rail sliding table two 1501, thereby making light beam C and light beam D produce interference fringe, if the optical path difference is less than the coherence length of light source, then the light waves coincide in time when superimposed, and have fixed phase difference, and interference fringe can be observed, and if the optical path difference is greater than the coherence length, then the light waves do not coincide in time when superimposed, and the result of superposition is only light intensity addition, and interference fringe cannot be observed. Therefore, the coherence length can be measured by recording the moving distance of mirror two 15.
[0018] The coherence degree parameter can be input on computer 16, and the phase modulator 3, guide rail sliding table one 501 and guide rail sliding table two 1501 are controlled by controller 18, so that the purpose of automatically regulating and controlling the coherence of light beam is achieved.
[0019] The circuit and mechanical connection related in the utility model are the common means adopted by the person skilled in the art, and the technical inspiration can be obtained through limited tests, which belongs to the public common knowledge.
[0020] The components not described in detail in the paper are prior art.
[0021] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A device for detecting the degree of coherence of partially coherent light, comprising a laser (1), characterized in that: The laser (1) right side has beam expander (2), the beam expander (2) right side has phase modulator (3), the phase modulator (3) right side has convex lens one (4), the convex lens one (4) right side has focal length adjustment mechanism, the focal length adjustment mechanism right side has rotating diffuser, the rotating diffuser right side has convex lens three (7), the convex lens three (7) right side has beam splitter one (8), the beam splitter one (8) rear side has double slit plate (17), the beam splitter one (8) and the double slit plate (17) between have narrow band filter (9), the double slit plate (17) rear has CCD camera one (10), the beam splitter one (8) right side has time coherent light detection mechanism, the one partial coherent light coherence degree regulation and control detection device outside has controller (18), the controller (18) in has microprocessor, the controller (18) with laser (1), phase modulator (3), focal length adjustment mechanism, rotating diffuser, CCD camera one (10), time coherent light detection mechanism, computer (16) electric connection.
2. The apparatus according to claim 1, wherein the apparatus is configured to: determine the coherence degree of the light based on the intensity of the light. The focal length adjustment mechanism includes convex lens two (5), the convex lens two (5) below connecting guide rail sliding table one (501), the guide rail sliding table one (501) and the controller (18) electrically connected.
3. The apparatus according to claim 2, wherein the apparatus is configured to: determine the coherence degree of the light based on the first and second signals. The guide rail sliding table one (501) and the convex lens two (5) between have grating ruler (19), the grating ruler (19) and the controller (18) electrically connected.
4. The apparatus of claim 1, wherein the apparatus is configured to: determine a degree of coherence of the light based on the first and second signals. The rotating diffuser includes ground glass (6), the ground glass (6) has motor (601), the motor (601) below connecting base (602), the motor (601) and the controller (18) electrically connected.
5. The partially coherent optical coherence modulation and detection device according to claim 1, characterized in that: The time coherent light detection mechanism includes beam splitter two (11), the beam splitter two (11) is located in the beam splitter one (8) right side, the beam splitter two (11) rear side has mirror one (14), the beam splitter two (11) other side has convex lens four (12), the convex lens four (12) front has CCD camera two (13), the CCD camera two (13) and the controller (18) electrically connected.
6. The apparatus according to claim 5, wherein: The beam splitter two (11) right side has mirror two (15), the mirror two (15) below connecting guide rail sliding table two (1501), the guide rail sliding table two (1501) and the controller (18) electrically connected.