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CN-121978817-A - Elliptic deformation mirror and design method thereof

CN121978817ACN 121978817 ACN121978817 ACN 121978817ACN-121978817-A

Abstract

The invention relates to the technical field of self-adaptive optics, in particular to an elliptical deformable mirror and a design method thereof, wherein the deformable mirror comprises: the device comprises an elliptical reflector, a driving unit array, semi-ellipsoidal contacts and a mounting base, wherein the semi-minor axis of a deformable effective area of the elliptical reflector is larger than or equal to the radius of a light beam to be corrected, the semi-major axis of the deformable effective area of the elliptical reflector is determined according to the radius and the incident angle of the light beam to be corrected, the driving unit array is arranged on the mounting base, the output end of each driving unit in the driving unit array is provided with the semi-ellipsoidal contacts, the semi-ellipsoidal contacts are abutted with the elliptical reflector, and the surface shape of the elliptical reflector is changed by adjusting the elongation of each driving unit so as to correct the wave front distortion of the light beam to be corrected. The invention ensures that the projection shape of the light beam on the mirror surface is matched with the deformed mirror surface, ensures that the non-normal incident light beam completely falls in the effective correction area of the deformed mirror, and effectively saves the occupied space of the deformed mirror.

Inventors

  • CHEN JIAN
  • WANG ZHONGSHI
  • TIAN DAPENG

Assignees

  • 中国科学院长春光学精密机械与物理研究所

Dates

Publication Date
20260505
Application Date
20260408

Claims (7)

  1. 1. An elliptical deformation mirror is characterized by comprising an elliptical reflecting mirror, a driving unit array, a semi-ellipsoidal contact head and a mounting base; the deformable effective area semi-minor axis of the elliptical reflecting mirror is larger than or equal to the radius of the light beam to be corrected, and the deformable effective area semi-major axis of the elliptical reflecting mirror is determined according to the radius and the incidence angle of the light beam to be corrected; the driving unit array is arranged on the mounting base, the output end of each driving unit in the driving unit array is provided with the semi-ellipsoidal contact head, the semi-ellipsoidal contact head is in butt joint with the elliptical reflecting mirror, and the surface shape of the elliptical reflecting mirror is changed by adjusting the elongation of each driving unit so as to correct the wave front distortion of the light beam to be corrected.
  2. 2. An elliptical deformable mirror according to claim 1, wherein the elliptical reflector is deformable in the effective area semi-minor axis The deformable effective area semi-major axis of the elliptic reflecting mirror ; Wherein, the Indicating the radius of the beam to be corrected, Indicating the angle of incidence of the beam to be corrected.
  3. 3. An elliptical deformable mirror according to claim 1, wherein the drive units in the array of drive units are electrostrictive or magnetostrictive materials.
  4. 4. The elliptical deformable mirror of claim 1, wherein each of the drive units in the array of drive units is of a rectangular cylindrical structure, one end of the drive unit is fixed to the mounting base, and the other end of the drive unit is connected to the semi-ellipsoidal contact head.
  5. 5. The elliptical deformable mirror of claim 1, wherein the semi-ellipsoidal contact head has a stiffness that is greater than a stiffness of the elliptical reflector.
  6. 6. A method for designing an elliptical deformable mirror, for realizing the elliptical deformable mirror according to any one of claims 1 to 5, comprising: S1, determining the radius of a light beam to be corrected according to application requirements And angle of incidence According to the radius of the light beam to be corrected And angle of incidence Semi-minor axis defining deformable active area of elliptical mirror And a semi-major axis ; S2, setting a radius larger than or equal to the radius of the light beam to be corrected The position of each driving unit in the driving unit array is uniformly arranged in the circular reference mirror; S3, according to the radius of the circular reference mirror Setting the semi-long axis of elliptical reflector Semi-minor axis of elliptical mirror ; S4, mapping the position of each driving unit in the circular reference mirror in the S2 into the elliptical reflecting mirror; S5, establishing an elliptical deformation mirror simulation model comprising an elliptical reflection mirror, a driving unit array, a semi-elliptical contact head and a mounting base, and calculating the surface deformation area of the elliptical reflection mirror when a single driving unit is stretched by a finite element analysis method And adjusting the half axis length of the semi-ellipsoidal contact in the x, y and z directions 、 、 Deforming the surface into a deformed region Is elliptical and has a surface deformation region Is equal to the length-axis ratio of 。
  7. 7. The method for designing an elliptical deformable mirror according to claim 6, wherein S4 comprises: the center position coordinates of each driving unit in the circular reference mirror are expressed as ; The central position coordinate of each driving unit after being mapped into the elliptical reflecting mirror is 。

Description

Elliptic deformation mirror and design method thereof Technical Field The invention belongs to the technical field of self-adaptive optics, and particularly relates to an elliptical deformable mirror and a design method thereof. Background The deformable mirror is a core wavefront correction device in the self-adaptive optical system and mainly comprises a driving unit array and a reflecting mirror, and can compensate wavefront distortion caused by atmospheric turbulence or system aberration by changing the reflecting surface shape in real time, so that the imaging quality and transmission performance of the optical system are obviously improved. The deformable mirror can be divided into a single-piezoelectric-plate deformable mirror, a double-piezoelectric-plate deformable mirror, a stacked piezoelectric deformable mirror, a magnetic-driven deformable mirror and other forms, and has important application in the fields of laser communication, astronomical observation, fundus imaging and the like. However, conventional deformable mirrors typically employ a circular aperture design with an effective correction area perpendicular to the optical axis, and are only suitable for normal or low angle incidence beams. When a light beam is obliquely incident on the surface of the circular deformable mirror at a large angle, the projection area of the light beam on the mirror surface becomes elliptical, the radius of the circular deformable mirror can only be adapted to the semi-major axis direction, redundancy exists in the semi-minor axis direction, and the edge area of the mirror surface cannot be effectively utilized. The defects not only reduce the utilization efficiency of the correction aperture, but also lead to the compression of the size of the light beam which can be effectively corrected, and limit the flexibility of the design of the light path turning structure of the adaptive optical system. Disclosure of Invention Therefore, the invention aims to provide the elliptical deformable mirror and the design method thereof, and innovatively adopts the elliptical deformable mirror, so that the obliquely incident light beam can be accurately adapted, the large-angle obliquely incident light beam is ensured to fall in the effective correction area of the wavefront corrector completely, the wavefront deformable mirror is utilized to the maximum extent, the system space occupied by the redundant lens area of the traditional circular deformable mirror is avoided, and the common space conflict problem in the self-adaptive optical system is greatly relieved. In order to achieve the above purpose, the technical scheme of the invention is realized as follows: one aspect of the invention provides an elliptical deformable mirror comprising: The device comprises an elliptical reflector, a driving unit array, a semi-ellipsoidal contact head and a mounting base; the semi-minor axis of the deformable effective area of the elliptical reflecting mirror is larger than or equal to the radius of the light beam to be corrected, and the semi-major axis of the deformable effective area of the elliptical reflecting mirror is determined according to the radius and the incidence angle of the light beam to be corrected; The driving unit array is arranged on the mounting base, the output end of each driving unit in the driving unit array is provided with a semi-ellipsoidal contact head, the semi-ellipsoidal contact head is in butt joint with the elliptical reflecting mirror, and the surface shape of the elliptical reflecting mirror is changed by adjusting the elongation of each driving unit so as to correct the wave front distortion of the light beam to be corrected. Preferably, the elliptical mirror is deformable with the minor axis of the active area halfElliptic reflector deformable effective area semi-major axis; Wherein, the Indicating the radius of the beam to be corrected,Indicating the angle of incidence of the beam to be corrected. Preferably, the driving units in the driving unit array are electrostrictive materials or magnetostrictive materials. Preferably, each driving unit in the driving unit array is of a strip column structure, one end of the driving unit is fixed on the mounting base, and the other end of the driving unit is connected with the semi-ellipsoidal contact head. Preferably, the semi-ellipsoidal contact has a stiffness greater than the stiffness of the elliptical reflector. Another aspect of the present invention provides a method for designing an elliptical deformable mirror, for implementing the elliptical deformable mirror, including: S1, determining the radius of a light beam to be corrected according to application requirements And angle of incidenceAccording to the radius of the light beam to be correctedAnd angle of incidenceSemi-minor axis defining deformable active area of elliptical mirrorAnd a semi-major axis; S2, setting a radius larger than or equal to the radius of the light beam to be correctedTh