Abstract

We present a new method of angular measurement, which is to rotate a 15-mm-diameter, 3-mm-thick crystal quartz plate in a He–Ne laser cavity to produce a laser mode split. The magnitude of the mode split (in hertz) represents the angle of rotation. The experimental devices used are described. The stability of the beat frequency is 0.78 kHz (1σ). A sensitivity of 2.62 × 10⁴ Hz/″, where ″ is angular seconds, has been reached and the repeatability is 0.3″. The principal error factors are discussed.

© 1995 Optical Society of America

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