Spectrum Invariance for a Particular Class of Optical Fields Propagated in Far Zone |
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Authors: | Yoshihiro Ohtsuka |
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Institution: | (1) Department of Engineering Science, Faculty of Engineering, Hokkaido University, Sapporo 060, Japan |
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Abstract: | This paper describes invariance of the normalized optical spectrum for a particular class of optical fields propagated in the far zone from a secondary, spatially, partially coherent source. The optical field across the secondary planar source is inhomogeneous to give the complex degree of spectral coherence such that μ = h(αω(ρ1–ρ2))exp(iɛω(ρ12–ρ22)), where α, ɛ are constants, ω is optical frequency, and ρ1, ρ2 denote two points in the secondary source. This expression for μ is the same as obtained in the Fresnel zone from a primary, spatially incoherent source. The invariance law does not hold for the spectrum of the light propagated from the primary source. |
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Keywords: | spectrum invariance on propagation inhomogeneous optical fields particular complex degree of spectral coherence |
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