Abstract
The technique of frequency offsetting is of considerable importance for high-resolution laser spectroscopy and metrology. The principal difficulties connected with phase/frequency-locking techniques applied to lasers are due to ineffective control of the fast frequency fluctuations of the beat signal.1 Fast fluctuations are not stochastically correlated, and they combine to increase the instantaneous spectral width of the frequency difference detected by heterodyne techniques.
© 1988 Optical Society of America
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