CN103149708A - Any field polarization state control system - Google Patents
Any field polarization state control system Download PDFInfo
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- CN103149708A CN103149708A CN2013100990308A CN201310099030A CN103149708A CN 103149708 A CN103149708 A CN 103149708A CN 2013100990308 A CN2013100990308 A CN 2013100990308A CN 201310099030 A CN201310099030 A CN 201310099030A CN 103149708 A CN103149708 A CN 103149708A
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Abstract
The invention discloses an any field polarization state control system, which is an optical system for controlling any field distribution light field polarization state. In the system, a polarization control panel manufactured by using an electro-optical crystal array is used, so that polarization control of incident laser beams is realized, incident laser light is converted into a predicted polarization state, and incident laser light can even be converted into non-polarized light; and the any field polarization state control system can be applied to an ICF (Inter-Communication Flip-Flop) driver cavity, multi-beam depolarization is realized, and uniform irradiation of a target surface is realized.
Description
Technical field
The present invention relates to a kind of optical system that can control any field distribution light field polarization state.This system can be converted to any field distribution light field such as expection polarization states such as nonpolarized lights, even can reach the polarization state of light field is eliminated fully, this will be conducive to interfere speckle such as the beamlet that reduces in hot spot in the ICF device, thereby realize the purpose to the even cunning of bundle of laser.
Background technology
For the laser aid of realizing inertial confinement fusion (ICF, Inertial Confinement Fusion), it refers to that to the polarization that focuses on the target surface light beam direction of electric field component vibration in light field is vertical with the direction of propagation.On the plane of propagating perpendicular to light, electric field component (also being called light vector) has different vibrational states, thus corresponding different polarization state.Polarizing beam has many practical uses.For example, adopt the electromagnetism wave energy of two bundle quadratures of same frequency to make the transfer rate of signal double in satellite communication and optical fiber communication; The biological and chemical scientist utilizes left-handed and the difference right-hand circular polarization absorptivity is detected chemical molecular or the biomacromolecule with enantiomerism bulk properties; The laser beam of different polarization states also is used in quanta cryptology technique; In without wound laser diagnosis and treatment diagnostic techniques, the polarized light imaging is also the very application in forward position; In the optical detective technology to the pathologic pathology of biological tissue, the polarization parameter (being polarization state) that includes in the information of output light field.In addition, the laser aid for inertial confinement fusion (ICF, Inertial Confinement Fusion) needs incident laser is converted to nonpolarized light, reaches the purpose of depolarization, thereby is conducive to realize the Uniform Irradiation of target surface.At present, the type of Polarization Controller is a lot, but principle is all to make two components of a polarization state produce different phase delay by birefringence effect, thereby regenerates desired polarization state again.According to its know-why, Polarization Controller is broadly divided into three classes: position angle control type, retardation control type and position angle-retardation control type.But there are a lot of shortcomings in this class Polarization Controller, and is as high in element costs such as wave plate, lenticules, and needs the plating anti-reflection film reducing reflection loss, and wave plate is to wavelength sensitive etc.Complete optical fiber polarization controller based on same principle occurred afterwards, and its loss is little, and cost is low, but still to wavelength sensitive, and control rate is slow.And liquid crystal type, electro-optic crystal type, the variable polarization controllers such as Retardation Sheets that turn of piezoelectric ceramics be suggested in succession, but all have some unvanquishable shortcomings, so always underway to the research of Polarization Controller.In order the polarization state of any light field to be converted into the polarization state of any expection, we propose a kind of brand-new polarization control system.
Summary of the invention
At present, the relevant report of the control system of light field polarization state arbitrarily that there is not yet, but the polarization state of light field is a very important physical quantity in contemporary optics is used, such as just need to overcome the deficiency that existing polarization smoothing technology can't be eliminated the interference speckle of beamlet in the ICF device, native system is proposed by us based on this.Light field polarization state control system in the present invention can realize the Polarization Control of any light field, even incident laser can be converted to nonpolarized light, thereby avoids light beam that the interference of beamlet occurs when focusing on, thereby reaches the purpose of the even cunning of bundle.
Technical scheme of the present invention is: have a light field polarization state to control array board in system and device, this plate plays the effect of Polarization Control, is made of p * q processing unit, and a controllable electric luminescent crystal is settled in each unit, as the KDP crystal.By adding that suitable voltage makes the electro-optic crystal sheet produce to two components of incident polarized light the bit phase delays that are fit to, thereby make emergent light become our needed polarized light, reach the purpose of modulated incident light beam polarization state.Be divided into many beamlets when laser is controlled array board by polarization state, the amplitude of each beamlet all is subject in various degree modulation mutually with the position.Therefore, be converted into the target light field after laser is controlled array board by the light field polarization state, also can realize nonpolarized light completely, these light beam line focus lens converge to target surface, the speckle that brings due to the beamlet interference in the focal spot light intensity can be eliminated, thereby can realize the Uniform Irradiation of target surface.
The present invention compares with existing polarization control technology, its advantage is and can realizes the polarization state of each beamlet of any field distribution light field of incident is control effectively by controlling each unit wafer institute making alive, and then is converted into the polarization state of expection.For example, any light field can be converted into nonpolarized light.Critical piece in system and device is that the light field polarization state is controlled array board, is easy to make, and is simple in structure.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is device schematic diagram of the present invention.
Fig. 2 is the schematic diagram that the light field polarization state is controlled array board.
Fig. 3 is the schematic diagram that the light field polarization state is controlled first embodiment of array board.
Fig. 4 is the schematic diagram that the light field polarization state is controlled second embodiment of array board.
1 phase modulator in Fig. 1,2 gratings, 3 light field polarization states are controlled array board, 4 condenser lenses, 5 receive the target surface of light field
It is the controlled gyrotropi crystal array of a p * q that light field polarization state in Fig. 2 is controlled array board.
It is a random polarization plate that light field polarization state in Fig. 3 is controlled array board.
It is a cross polarization plate that light field polarization state in Fig. 4 is controlled array board.
Specific embodiments
Embodiments of the invention one, it is a random polarization plate that the light field polarization state is controlled array board, as shown in Figure 3.Through the position mutually the light field of modulation dispersion occurs after by grating, through being divided into a plurality of beamlets after the random polarization plate, and random change occurs in polarization state separately, finally by lens focus on target surface.Utilize the random polarization plate, by changing the polarization state of each subelement light beam, thereby at the inner different beamlet of polarization state that produces of high-aperture beam.
When laser beam was transmitted through native system, the video stretching in the smoothing by spectral dispersion technology and grating dispersion made the interference speckle of the beamlet generation of each frequency produce displacement on dispersion direction, thereby realized the even cunning of focal spot on the time average yardsticks.And the major effect of the use focal spot field distribution of polarization state control array board is different wave length is existed
x,
yThe Modulation and Amplitude Modulation of direction stack is different mutually with the position, makes output light in the polarization state difference at different wave length place, causes light polarization to occur significantly to change, and has realized depolarization.
Embodiment of the present invention two, it is a cross polarization plate that the light field polarization state is controlled array board, as shown in Figure 4.For the cross polarization plate, the outgoing beam that makes each subelement can only be the line polarisation of a certain polarization direction.
Claims (3)
1. one kind can be used for optical processing system that any field distribution light field polarization state of incident is controlled, formed by position phase control device, grating, light field polarization state control array board and lens, it is characterized in that: after incident laser passes through position phase control device and grating, make the interference speckle of the beamlet generation of each frequency produce displacement on dispersion direction, control array board by the light field polarization state again, the wavelet of different wave length is carried out different amplitudes and position modulation mutually, make output light in the polarization state difference at different wave length place, to obtaining the polarization state of expection.
2. light field polarization state according to claim 1 is controlled array board, it is characterized in that: the light field polarization state is controlled array board and is comprised p * q processing unit, and each processing unit is placed a controlled electro-optic crystal.
3. controlled electro-optic crystal according to claim 2, it is characterized in that: can make the electro-optic crystal sheet produce to two components of incident polarized light the bit phase delay that is fit to by adding suitable voltage, thereby make emergent light become the polarized light of expection, reach the purpose of modulated incident light beam polarization state.
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| CN2013100990308A CN103149708A (en) | 2013-03-26 | 2013-03-26 | Any field polarization state control system |
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| CN2013100990308A CN103149708A (en) | 2013-03-26 | 2013-03-26 | Any field polarization state control system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107402454A (en) * | 2017-08-31 | 2017-11-28 | 东南大学 | The non-linear ellipse inclined rotating device of radial variations is realized based on elliptical polarization vectorial field |
| CN113091896A (en) * | 2021-03-18 | 2021-07-09 | 西北工业大学 | Method and light path for dynamically measuring complete information of any light field based on polarization grating |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101546050A (en) * | 2009-05-05 | 2009-09-30 | 中国科学院上海光学精密机械研究所 | Electric control phase shift crystal double refraction free space optical bridge |
| CN102253493A (en) * | 2011-06-27 | 2011-11-23 | 广东工业大学 | Laser beam uniform radiation optical system |
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2013
- 2013-03-26 CN CN2013100990308A patent/CN103149708A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101546050A (en) * | 2009-05-05 | 2009-09-30 | 中国科学院上海光学精密机械研究所 | Electric control phase shift crystal double refraction free space optical bridge |
| CN102253493A (en) * | 2011-06-27 | 2011-11-23 | 广东工业大学 | Laser beam uniform radiation optical system |
Non-Patent Citations (3)
| Title |
|---|
| K. TSUBAKIMOTO, T. JITSUNO, N. MIYANAGA, M. NAKATSUKA, T. KANABE: "Suppression of speckle contrast by using polarization property on second harmonic generation", 《OPTICS COMMUNICATIONS》, vol. 103, no. 34, 15 November 1993 (1993-11-15) * |
| 江秀娟: "高功率激光驱动器光束匀滑技术的研究进展", 《激光与光电子学进展》, vol. 47, no. 9, 30 September 2010 (2010-09-30) * |
| 肖峻，吕百达: "偏振控制板对干涉斑纹的匀滑特性", 《中国激光》, vol. 27, no. 7, 31 July 2000 (2000-07-31) * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107402454A (en) * | 2017-08-31 | 2017-11-28 | 东南大学 | The non-linear ellipse inclined rotating device of radial variations is realized based on elliptical polarization vectorial field |
| CN113091896A (en) * | 2021-03-18 | 2021-07-09 | 西北工业大学 | Method and light path for dynamically measuring complete information of any light field based on polarization grating |
| CN113091896B (en) * | 2021-03-18 | 2023-03-14 | 西北工业大学 | Method and light path for dynamically measuring complete information of any light field based on polarization grating |
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Application publication date: 20130612 |