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Modal Analysis of Partially-Coherent Submillimetre-Wave Quasioptical Systems

Authors:
S. Withington, J.A. Murphy
Abstract:
We consider the modal analysis of partially-coherent submillimetre-wave quasioptical systems. According to our scheme the cross-spectral density is expanded as a sum of partially-coherent propagating free-space modes. The coherence matrix, the elements of which are determined by evaluating bimodal overlap integrals, completely describes the state of the field at a plane and can be traced through the optical system to another plane by means of a scattering matrix. Whereas diagonalising the scattering matrix gives the natural modes of the optical system, diagonalising the coherence matrix gives the natural modes of the field. As a special case, we consider the case where the field at the source plane is completely incoherent. After developing a number of analytical tools, we demonstrate the technique by analysing the behaviour of a Gaussian-beam telescope. Throughout the paper we emphasise the physical significance of the equations derived.
Categories:
Optics
Year:
1997
Session:
9
Full-text:
Download a PDF of this paper.
Page Number(s):
446-465