title: Experimental observation of fractional Fourier transform for a partially coherent optical beam with Gaussian statistics.
abstract: We report the experimental observation of the fractional Fourier transform (FRT) for a partially coherent optical beam with Gaussian statistics [i.e., partially coherent Gaussian Schell-model (GSM) beam]. The intensity distribution (or beam width) and the modulus of the square of the spectral degree of coherence (or coherence width) of a partially coherent GSM beam in the FRT plane are measured, and the experimental results are analyzed and agree well with the theoretical results. The FRT optical system provides a convenient way to control the properties, e.g., the intensity distribution, beam width, spectral degree of coherence, and coherence width, of a partially coherent beam.
authors.affiliation: Centre for Optical and Electromagnetic Research, Zhejiang University, Hangzhou, China.
authors.forename: Fei
authors.initials: F
authors.lastname: Wang
authors.forename: Yangjian
authors.initials: Y
authors.lastname: Cai