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Applied Optics

Applied Optics


  • Vol. 41, Iss. 13 — May. 1, 2002
  • pp: 2481–2487

Phase anomalies in Fourier-transform spectrometers: an absorbing beam splitter is neither sufficient nor necessary

John C. Brasunas  »View Author Affiliations

Applied Optics, Vol. 41, Issue 13, pp. 2481-2487 (2002)

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Recently it has been a topic of some discussion that the phase associated with part of the self-emission of a Fourier-transform spectrometer may differ neither by 0 nor by π rad from the phase of an external target if there is absorption in the beam splitter. The conventional interpretation of this has been to separate the self-emission into three terms: instrument emission from the input port, in phase with the external target; emission from the secondary input port, π rad from the target; and emission from an absorbing beam splitter with an anomalous phase (neither 0 nor π rad with respect to the target). There is another necessary condition that has not received much attention, that the instrument not be isothermal. For polarized radiation there is an additional condition that suppresses the anomalous phase, and for unpolarized radiation there is a way to produce an anomalous phase without beam-splitter absorption.

© 2002 Optical Society of America

OCIS Codes
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(230.1360) Optical devices : Beam splitters
(300.6300) Spectroscopy : Spectroscopy, Fourier transforms

Original Manuscript: September 21, 2001
Revised Manuscript: January 18, 2002
Published: May 1, 2002

John C. Brasunas, "Phase anomalies in Fourier-transform spectrometers: an absorbing beam splitter is neither sufficient nor necessary," Appl. Opt. 41, 2481-2487 (2002)

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