Sub-Doppler spectroscopy of (H2O)-O-18 at 1.4 µm

Year: 2000

Authors: Gagliardi G., Rusciano G., Gianfrani L.

Autors Affiliation: Ist. Naz. Per la Fis. della Materia, Dipto. di Sci. Fisiche dell

Abstract: We performed saturated-absorption spectroscopy of (H2O)-O-18 at 1.4 mu m, using a low-power mirror-extended distributed-feedback diode laser. Although the rotational lines of the nu(1) + nu(3) band investigated in this work had a small transition dipole moment, saturation was possible thanks to a short Fabry-Perot cavity with a finesse of about 500. We investigated the sub-Doppler spectrum of the 2(12) –> 1(11) line for different sample gas pressures. A pressure-broadening coefficient of 32.9 +/- 0.7 MHz/Torr was measured. We also evaluated the saturation intensity as well as the transition dipole moment. To our knowledge, the observed Lamb dip represents the first narrow resonance at 1.4 mu m.


Volume: 70 (6)      Pages from: 883  to: 888

KeyWords: molecular absorption line; saturation spectroscopy; high finesse cavity
DOI: 10.1007/PL00021149

Citations: 11
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