In recent years, much work has been done in experimental studies to frequency lock laser diodes to atomic or molecular resonances.1 By such techniques it is possible to improve greatly the laser frequency stability and to define precisely its nominal value. For laser sources operating in the 0.8-μm range, rubidium is the preferred specie and each isotope offers two resonance lines, one at 780 nm (D2 line) and one at 795 nm (D1 line). Both linear and saturated absorption have been used, and laser frequency charcteristics are published.2,3

© 1989 Optical Society of America

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