IMPROVEMENT OF SPECKLE STATISTICS IN DOUBLE-WAVELENGTH SUPERHETERODYNE INTERFEROMETRY

摘要

In this paper we analyze the probability density function of the superheterodyne signal obtained in a two-wavelength interferometer from the beat of a local oscillator laser beam with a speckled return beam Theoretical investigation shows that, by using an increased number of spatially one can improve noticeably the detection probability of the superheterodyne Experimental results obtained with a four-quadrant detector are in good agreement with theory. [References: 12]