Fully stabilized mid-infrared frequency comb for high-precision molecular spectroscopy

Markku Vainio, Juho Karhu

Research output: Contribution to journalArticleScientificpeer-review

36 Citations (Scopus)


A fully stabilized mid-infrared optical frequency comb spanning from 2.9 to 3.4 µm is described in this article. The comb is based on half-harmonic generation in a femtosecond optical parametric oscillator, which transfers the high phase coherence of a fully stabilized near-infrared Er-doped fiber laser comb to the mid-infrared region. The method is simple, as no phase-locked loops or reference lasers are needed. Precise locking of optical frequencies of the mid-infrared comb to the pump comb is experimentally verified at sub-20 mHz level, which corresponds to a fractional statistical uncertainty of 2 × 10-16 at the center frequency of the mid-infrared comb. The fully stabilized mid-infrared comb is an ideal tool for high-precision molecular spectroscopy, as well as for optical frequency metrology in the mid-infrared region, which is difficult to access with other stabilized frequency comb techniques.
Original languageEnglish
Pages (from-to)4190-4200
JournalOptics Express
Issue number4
Publication statusPublished - 20 Feb 2017
MoE publication typeA1 Journal article-refereed


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