Abstract

Absolute frequency measurements, with up to 1×1011 level accuracies, are presented for 60 lines of the P and R branches for the ν1+ν3 band of C213H2 at 1.5μm (194THz). The measurements were made using cavity-enhanced, diode-laser-based saturation spectroscopy. With one laser system stabilized to the P(16) line and a second laser system stabilized to the line whose frequency was to be determined, a Cr:YAG frequency comb was employed to accurately measure the tetrahertz level frequency intervals. The results are compared with recent work from other groups and indicate that these lines would form a basis for a high-quality atlas of reference frequencies for this region of the spectrum.

© 2006 Optical Society of America

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