Accurate absolute frequencies of the nu(1) + nu(3) band of (C2H2)-C-13 determined using an infrared inode-locked Cr : YAG laser frequency comb

摘要

Absolute frequency measurements, with up to 1 x 10(-11) level accuracies, are presented for 60 lines of the P and R branches for the v(1)+v(3) band of (C2H2)-C-13 at 1.5 mu m (194 THz). 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. (c) 2006 Optical Society of America.