J4 ›› 2010, Vol. 27 ›› Issue (4): 464-467.

• Laser Applications • Previous Articles     Next Articles

Simple measurement of optical Goos-Hänchen shift based on liquid crystal light valve and light beam profiler

HAN Xiao-hong,YANG Yan-fang,HE Ying,XU Kai,LI Chun-fang   

  1. Department of Physics, College of Sciences, Shanghai University, Shanghai 200444, China
  • Received:2009-09-08 Revised:2009-10-19 Published:2010-07-28 Online:2010-06-13

Abstract:

A novel approach to directly observe the small optical beam shift has been proposed based on light crystal light valve (LCLV) and the light beam profiler (LBP). In this article, firstly we research the beam polarization of the LCLV. We find that the beam polarization changes as well when the applied voltage changes. After that, we utilize the LCLV to modulate the polarization state of the beam and LBP to register the barrycenter of it. Using the new experimental measurement we detect the Goos-H?nchen shift (GH shift) at the condition of total internal reflection on a prism-air interface. This method doesn’t need complex external processing circuit, and the experimental result show good agreement with theoretical calculation. Moreover, the two-dimensional laser beam shift (such as GH and IF shifts) should also be easily observed simultaneously by using our experimental setup.

Key words: optoelectronics, Goos-Hänchen shift, liquid crystal light valve, light beam profiler