Precise frequency-difference measurement between the 1.66-μm transitions of methane

Kotaro Suzumura, Chikako Ishibashi, Hiroyuki Sasada

Research output: Contribution to journalArticle

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Abstract

We determined 66 frequency differences (FD's) between rovibrational lines of methane at the 1.66-μm 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.

Original languageEnglish
Pages (from-to)1356-1358
Number of pages3
JournalOptics Letters
Volume22
Issue number17
Publication statusPublished - 1997 Sep 1

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methane
molecular spectroscopy
beat frequencies
semiconductor lasers
spectrometers
cavities
high resolution

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Suzumura, K., Ishibashi, C., & Sasada, H. (1997). Precise frequency-difference measurement between the 1.66-μm transitions of methane. Optics Letters, 22(17), 1356-1358.

Precise frequency-difference measurement between the 1.66-μm transitions of methane. / Suzumura, Kotaro; Ishibashi, Chikako; Sasada, Hiroyuki.

In: Optics Letters, Vol. 22, No. 17, 01.09.1997, p. 1356-1358.

Research output: Contribution to journalArticle

Suzumura, K, Ishibashi, C & Sasada, H 1997, 'Precise frequency-difference measurement between the 1.66-μm transitions of methane', Optics Letters, vol. 22, no. 17, pp. 1356-1358.
Suzumura K, Ishibashi C, Sasada H. Precise frequency-difference measurement between the 1.66-μm transitions of methane. Optics Letters. 1997 Sep 1;22(17):1356-1358.
Suzumura, Kotaro ; Ishibashi, Chikako ; Sasada, Hiroyuki. / Precise frequency-difference measurement between the 1.66-μm transitions of methane. In: Optics Letters. 1997 ; Vol. 22, No. 17. pp. 1356-1358.
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