Effect of astigmatism on spectral switches of partially coherent beams
Zhao Guang-Pu(赵光普)ab, Xiao Xi (肖希)ab, Lü Bai-Da (吕百达)b
a Institute of Optoelectronic Information, Yibin University, Yibin 644007, China; b Institute of Laser Physics and Chemistry, Sichuan University, Chengdu 610064, China
Abstract A detailed study of the spectrum of partially coherent beams diffracted at an astigmatic aperture lens is performed. Considerable attention is paid to the effect of astigmatism on spectral switches of polychromatic Gaussian Schell-model beams. It is shown that the spectral switch can also take place in the vicinity of intensity minimum in a geometrical focal plane for the astigmatic case, but the astigmatism of the lens and the spatial correlation of the beam affect the critical position $u_{\rm c}$, spectral minimum $S_{\rm min}$, and transition height Δ of spectral switches.
Received: 22 April 2004
Revised: 22 May 2004
Accepted manuscript online:
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