Abstract
A laser light field oscillating in a multitude of transverse modes is analyzed to estimate the degree of coherence of the field. The phasor amplitude of the laser light is described using the expression for a confocal resonator field derived by Boyd and Gordon [ Bell Sys. Tech. J. 40, 489 ( 1961)]. The fringe visibilities around the optical axis are calculated by using a one-dimensional model with two sampling apertures. Light containing only even modes has a visibility of 1. The odd modes have a great influence on the degradation of visibilities.
© 1989 Optical Society of America
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