Absolute frequency measurement of the saturated absorption lines of methane in the 1.66 μm region

We have determined the absolute frequencies of the R(0) and Q(1) transitions of the 2 ν 3 band of 12 CH 4 in the 1.66-μm region to be 180.345 065 08(37) and 180.021 253 10(61) THz. The numbers in parentheses are the standard deviations in units of the last digit of the quoted frequencies. We have us...

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Bibliographic Details
Published in:Optics communications 1999-03, Vol.161 (4), p.223-226
Main Authors: Ishibashi, Chikako, Kourogi, Motonobu, Imai, Kazuhiro, Widiyatmoko, Bambang, Onae, Atsushi, Sasada, Hiroyuki
Format: Article
Language:English
Subjects:
Absolute frequency
Exact sciences and technology
Measurements common to several branches of physics and astronomy
Methane
Metrology, measurements and laboratory procedures
Near infrared diode laser
Optical frequency comb generator
Physics
Time and frequency
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Summary:We have determined the absolute frequencies of the R(0) and Q(1) transitions of the 2 ν 3 band of 12 CH 4 in the 1.66-μm region to be 180.345 065 08(37) and 180.021 253 10(61) THz. The numbers in parentheses are the standard deviations in units of the last digit of the quoted frequencies. We have used the 1.54-μm saturated absorption line of 13 C 2H 2 as a frequency reference and an optical frequency comb generator for bridging the frequency difference of 14 THz between the 1.66- and 1.54-μm radiations.
ISSN:0030-4018
1873-0310
DOI:10.1016/S0030-4018(99)00045-0