Abstract
Simple expressions are given for the halfwidth and finesse of a Fabry-Perot interferometer fringe broadened by defects. The expressions are unrestricted as to defect magnitude and have good accuracy for most practical forms of defect. The results are applicable to mirror surface defects, parallelism errors, angular dispersion of illumination, finite spectral linewidth, and fluctuations in interferometer spacing as well as most combinations of two or more types of broadening defect. An experimental investigation of broadening due to parallelism errors confirms the theory.
© 1984 Optical Society of America
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