Time-drift Effect of Laser Speckle
激光散斑时间漂移效应研究(英文)

The time-drift effect of laser speckle was reported. A speckle model was introduced. The validity was verified by the statistical properties of intensity and argument of the complex amplitude at the observation plane. Based on this speckle model and correlation method between speckle patterns, nearly all physical factors which may result in the time-drift effect of speckle according to experimental parameters were simulated.The results show that two factors,which vertical-cavity surface-emitting laser(VCSEL) and charge coupled device(CCD),Other factors such as fluctuation of laser intensity, changes of wavelength of light and air refractive index, etc., only bring tiny changes of speckle pattern, or even do not cause the time-drift effect of laser speckle at all.