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Optica, Optics Express, 15(16), p. 11637, 2008

DOI: 10.1364/oe.16.011637

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Lamb-dip-locked quantum cascade laser for comb-referenced IR absolute frequency measurements

Journal article published in 2008 by S. Borri, S. Bartalini, P. De Natale, I. Galli, P. Cancio, G. Giusfredi, D. Mazzotti, A. Castrillo ORCID, L. Gianfrani ORCID, P. De Natale
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

The frequency of a DFB quantum cascade laser (QCL) emitting at 4.3 microm has been long-term stabilized to the Lamb-dip center of a CO2 ro-vibrational transition by means of first-derivative locking to the saturated absorption signal. Thanks to the non-linear sum-frequency generation (SFG) process with a fiber-amplified Nd:YAG laser, the QCL mid-infrared (IR) radiation has been linked to an optical frequency-comb synthesizer (OFCS) and its absolute frequency counted with a kHz-level precision and an overall uncertainty of 75 kHz.