SPECTRAL SHIFTS OF APERTURED GAUSSIAN SCHELL-MODEL BEAM

The spectral shift of Gaussian Schell-model beam passing through a circular aperture is investigated theoretically in this paper. Various factors which have influences on the spectral shift are analysed. The numerical results show that the shift of the spectrum depends on the size of the aperture, the effective correlation length and the spectrum width of the light source. Additionally, the amount of the spectral shift depends on the propagation distance. In the far-field, the spectrum is blue-shifted, while in the near field it is red-shifted under some conditions.