Ultranarrow (13)C(2)H(2) saturated-absorption lines at 1.5 microm.
The saturation spectroscopy of molecular transitions at 1.5microm 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 (13)C(2)H(2) saturation intensity. To our knowledge, these lines are the narrowest reported 1.5-microm frequency references and should be suitable for high-quality 1.5-microm laser frequency standards.
de Labachelerie
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Nakagawa
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Ohtsu
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