The first task in optical system modeling is the proper representation of the source. A broad range of sources may appear in modern optical systems, from the mercury lamp to solid-state laser, and from LED to ultrashort laser. They may have different spectral and spatial distributions, coherent properties, and polarization states. Based on electromagnetic field representation, any source field can be decomposed into coherent and/or incoherent modes, in spatial and spectral domains. That provides a solid basis for the subsequent modeling of the optical system.
The Applied Computational Optics group has been actively working together with Institute of Photonics, Eastern Finland University, for the investigation on partially coherent light and the electromagnetic representation of them. That includes e.g. coherence property study on temporally modulated stationary sources, shifted-elementary-mode representation of spatially partially coherent sources, and so on.
H. Lajunen, J. Tervo, J. Turunen, P. Vahimaa, F. Wyrowski, Spectral coherence properties of temporally modulated stationary light sources, Opt. Express 11, 1894-1899 (2003).
J. Tervo, J. Turunen, P. Vahimaa, F. Wyrowski, Shifted-elementary-mode representation for partially coherent vectorial fields, J. Opt. Soc. Am. A, 27(9), 2004-2014 (2010).
F. Wyrowski, C. Hellmann, R. Krieg, H. Schweitzer, Modeling the propagation of ultrashort pulses through optical systems, Proc. SPIE, 7589:7589-7589-8 (2010).