Design of cavity-enhanced absorption cell for reducing transit-time broadening

Masashi Abe, Kana Iwakuni, Sho Okubo, Hiroyuki Sasada

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


To reduce the linewidth of Lamb dips, we introduce a cavity-enhanced absorption cell (CEAC) coupled with a Gaussian beam with a 1.9-mm 1/e2radius at the beam waist for the reduction of transit-time broadening. We state that transit-time broadening depends only on the beam radius at the beam waist. This fact is useful for the design of the CEAC, and a pair of concave and convex mirrors is thereby employed. We have carried out sub-Doppler resolution spectroscopy of the ν3band of CH4and the ν1band of CH3D using a difference-frequency-generation source and the CEAC, and the recorded Lamb dips narrow to 80 kHz (HWHM).

Original languageEnglish
Pages (from-to)5277-5280
Number of pages4
JournalOptics Letters
Issue number18
Publication statusPublished - 2014 Sept 15
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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