In this paper, we study the focusing of a stochastic electromagnetic beam by a bifocal lens. By taking the electromagnetic Gaussian Schell-model (EGSM) beam as an example, the changes in the spectral density, in the spectral degree of coherence, and in the spectral degree of polarization of the EGSM beam as the beam is focused by an unapertured bifocal lens are investigated. It is shown that the spectral density, the spectral degree of coherence, and the spectral degree of polarization of the focused electromagnetic EGSM beams depend upon the coherence lengths and focal lengths of the bifocal lens. The influence of the coherence lengths and the focal lengths on the focused spectral density, the spectral degree of coherence, and the spectral degree of polarization are investigated in great detail.
© 2008 Optical Society of America
Coherence and Statistical Optics
Original Manuscript: October 1, 2007
Revised Manuscript: March 13, 2008
Manuscript Accepted: March 25, 2008
Published: June 25, 2008
Guowen Zhang and Jixiong Pu, "Stochastic electromagnetic beams focused by a bifocal lens," J. Opt. Soc. Am. A 25, 1710-1715 (2008)