Spatial Light Modulator for wave rayscience（波rayscience空间光调制器）.pdfVIP

Spatial Light Modulator for wavefront correction 1, 2 1 1 1 A. Vyas , M. B. Roopashree , Ravinder Kumar Banyal , B Raghavendra Prasad 1Indian Institute of Astrophysics, Bangalore-560034, India 2Indian Institute of Science, Bangalore-560012, India Abstract: We present a liquid crystal method of correcting the phase of an aberrated wavefront using a spatial light modulator. A simple and efficient lab model has been demonstrated for wavefront correction. The crux of a wavefront correcting system in an adaptive optics system lies in the speed and the image quality that can be achieved. The speeds and the accuracy of wavefront representation using Zernike polynomials have been presented using a very fast method of computation. 1. INTRODUCTION The possibility of compensating wavefront aberrations was first suggested by Babcock [1]. The idea of compensation given by him was based on the electrostatic forces acting on oil film. The design was that the refractive index changes on the oil film can compensate for the aberrations. Later on when the proposal of Hartmann was implemented by Shack and Platt [2], to make the first Shack Hartmann sensor, people thought of compensating the wavefront using optics (deformable mirrors) rather than refractive index changes of materials. After the development of liquid crystals, the possibility of using the changing refractive index property for phase restoration applications has been explored. Most applications where phase restorations become essential are human eye aberration corrections and atmospheric turbulence compensations. The use of Spatial Light Modulator (SLM)