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Opt Express. 2008 Jul 21;16(15):11637-46.

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

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  • 1Istituto Nazionale di Ottica Applicata, CNR, Firenze, Italy.


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.

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