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

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http://hdl.handle.net/10138/312707

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Vainio , M & Karhu , J 2017 , ' Fully stabilized mid-infrared frequency comb for high-precision molecular spectroscopy ' , Optics Express , vol. 25 , no. 4 , pp. 4190-4200 . https://doi.org/10.1364/oe.25.004190

Title: Fully stabilized mid-infrared frequency comb for high-precision molecular spectroscopy
Author: Vainio, Markku; Karhu, Juho
Contributor: University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
Date: 2017-02-15
Language: eng
Number of pages: 11
Belongs to series: Optics Express
ISSN: 1094-4087
URI: http://hdl.handle.net/10138/312707
Abstract: A fully stabilized mid-infrared optical frequency comb spanning from 2.9 to 3.4 mu m 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 x 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. (C) 2017 Optical Society of America
Subject: 116 Chemical sciences
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