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
Original Manuscript: December 14, 1993
Published: June 1, 1994
M. de Labachelerie, K. Nakagawa, and M. Ohtsu, "Ultranarrow 13C2H2 saturated-absorption lines at 1.5 μm," Opt. Lett. 19, 840-842 (1994)