Abstract

The saturation spectroscopy of molecular transitions at 1.5 μm is reported. We show that it is possible, with a low-power laser diode, to obtain 2-MHz-wide acetylene saturated-absorption lines, and we give what is to our knowledge the first experimental estimation of 13C2H2 saturation intensity. To our knowledge, these lines are the narrowest reported 1.5-μm frequency references and should be suitable for high-quality 1.5-μm laser frequency standards.

© 1994 Optical Society of America

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