J4 ›› 2010, Vol. 27 ›› Issue (3): 288-292.

• Laser Tech. and Devices • Previous Articles     Next Articles

The analysis of temporal coherence of dynamic subjective speckle

Chang Hong, Yang Fugui, Dong Lei, Wang Anting, Xie Jianping, Ming Hai   

  1. Department of Physics, University of Science and Technology of China, Hefei 230026, China
  • Received:2009-07-10 Revised:2009-09-11 Published:2010-05-28 Online:2010-05-11

Abstract:

The formula of temporal coherence of dynamic subjective speckle has been deduced, by which the influence of optical parameters from the imaging system on temporal coherence of speckle has been analyzed. It is concluded that the affection of the parameters of screen on speckle temporal coherence can been neglected; the speckle temporal coherence is mainly affected by the diameter of the lens or the size of laser spot on screen. If the size of the laser spot is lager than that of resolution spot on object plane, the diameter of lens gives the mainly affection, while on the other side the size of laser spot gives the dominating affection and the temporal coherence can be reduced by reducing the size of laser spot on screen. The result is confirmed by simulation and experiment, which can give an instruction to speckle reduction in laser display.

Key words: subjective speckle∣dynamic speckle∣temporal coherence∣screen roughness