The frequency of a DFB quantum cascade laser (QCL) emitting at 4.3 um 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.
Lamb-dip-locked quantum cascade laser for comb-referenced IR absolute frequency measurements
Borri S;Bartalini S
;Galli I;Cancio P;Giusfredi G;Mazzotti D;De Natale P
2008
Abstract
The frequency of a DFB quantum cascade laser (QCL) emitting at 4.3 um 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.File in questo prodotto:
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Descrizione: Lamb-dip-locked quantum cascade laser for comb-referenced IR absolute frequency measurements
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