Abstract
For laser spectroscopy, it is often desirable to reduce the single-mode laser linewidth. This is usually accomplished by electronically locking the laser frequency to a passive reference cavity. Traditional locking schemes derive the feedback error signai from the intensity of the light transmitted through the cavity. However, the 90° phase shifted field amplitude of the wave reflected off the cavity provides an error signal which is markedly superior to those obtained from transmission.1 This amplitude has a dispersion shaped frequency dependence with long antisymmetric wings and a rapid passage through zero at resonance. It responds nearly instantaneously to changes in laser frequency. In this paper, we discuss how this signal can be easily obtained and used for laser stabilization by taking advantage of the interference between different cavity modes in the reflected wave front.
© 1983 Optical Society of America
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