TY - JOUR T1 - Absolute frequencies of H13C14N hydrogen cyanide transitions in the 1.5-µm region with the saturated spectroscopy and a sub-kHz scanning laser JF - Opt. Lett. Y1 - 2022 A1 - Jan Hrabina A1 - Martin Hosek A1 - Simon Rerucha A1 - Martin Cizek A1 - Zdenek Pilat A1 - Massimo Zucco A1 - Josef Lazar A1 - Ondrej Cip KW - BF KW - MF AB -

The wide span and high density of lines in its rovibrational spectrum render hydrogen cyanide a useful spectroscopic media for referencing absolute frequencies of lasers in optical communication and dimensional metrology. We determined, for the first time to the best of our knowledge, the molecular transitions' center frequencies of the H13C14N isotope in the range from 1526 nm to 1566 nm with 1.3&\#x00A0;×&\#x00A0;10\textminus10 fractional uncertainty. We investigated the molecular transitions with a highly coherent and widely tunable scanning laser that was precisely referenced to a hydrogen maser through an optical frequency comb. We demonstrated an approach to stabilize the operational conditions needed to maintain the constantly low pressure of the hydrogen cyanide to carry out the saturated spectroscopy with the third-harmonic synchronous demodulation. We demonstrated approximately a forty-fold improvement in the line centers' resolution compared to the previous result.

VL - 47 UR - https://opg.optica.org/ol/abstract.cfm?URI=ol-47-21-5704 ER -