Sub-Doppler resolution mid-infrared spectroscopy using a difference-frequency-generation source spectrally narrowed by laser linewidth transfer

Hideyuki Sera, Masashi Abe, Kana Iwakuni, Sho Okubo, Hajime Inaba, Feng Lei Hong, Hiroyuki Sasada

Research output: Contribution to journalArticle

4 Citations (Scopus)


The spectral linewidth of a 3.28 μm difference-frequency-generation source has been reduced to 3.5 kHz using a laser linewidth transfer technique [Opt. Express 21, 7891 (2013)]. We use an optical frequency comb with a broad servo bandwidth to transfer a narrow linewidth of a pump laser, a 1.06 μm Nd: YAG laser, to a signal laser, a 1.57 μm external-cavity laser diode. This source enables us to record the Lamb dip of the ν3 band R(2) E transition of methane with a molecular spectral linewidth of 21 kHz while the frequency axis is absolutely calibrated.

Original languageEnglish
Pages (from-to)5467-5470
Number of pages4
JournalOptics Letters
Issue number23
Publication statusPublished - 2015 Dec 1


ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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