Abstract
We determined 66 frequency differences (FD’s) between rovibrational lines of methane at the region. Following the technique developed by Nakagawa, et al. [Opt. Lett. 20, 410 (1995)], we measured the FD’s as the optical beat frequency between two external-cavity diode lasers locked at 1-MHz-wide saturated absorption dips of the methane lines. Even though the methane lines often overlap in Doppler-limited resolution, the spectrometer that we use resolves them and determines their FD’s with better than 40-kHz precision. This fact demonstrates that the methane lines are promising candidates for frequency reference and that this technique has great potential for high-resolution molecular spectroscopy.
© 1997 Optical Society of America
Full Article | PDF ArticleMore Like This
K. Nakagawa, M. de Labachelerie, Y. Awaji, and M. Kourogi
J. Opt. Soc. Am. B 13(12) 2708-2714 (1996)
Masashi Abe, Kana Iwakuni, Sho Okubo, and Hiroyuki Sasada
J. Opt. Soc. Am. B 30(4) 1027-1035 (2013)
M. Mürtz, B. Frech, P. Palm, R. Lotze, and W. Urban
Opt. Lett. 23(1) 58-60 (1998)