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Journal Articles Applied Physics Letters Year : 2023

Highly coherent phase-lock of an 8.1 μ m quantum cascade laser to a turn-key mid-IR frequency comb

B. Chomet
O. Lopez
L. del Balzo
A. Vasanelli
Y. Todorov
Benoît Darquié
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C. Sirtori

Abstract

A continuous-wave Fabry–Pérot quantum cascade laser (QCL) emitting at 8.1 μm operating in the single mode regime has been coherently phase locked to a turn-key low-noise commercial mid-Infrared (mid-IR) optical frequency comb. The stability of the comb used as a reference is transferred to the QCL resulting in an integrated residual phase error of 0.4 rad. The laser linewidth is narrowed by more than two orders of magnitude reaching sub-kHz level at 1 ms observation time, limited by the spectral purity of the mid-IR comb. Our experiment is an important step toward the development of both powerful and metrology-grade QCLs and fully stabilized QCL frequency comb and opens perspectives for precision measurements and frequency metrology in the mid-IR.
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Dates and versions

hal-04193002 , version 1 (24-11-2023)

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B. Chomet, D. Gacemi, O. Lopez, L. del Balzo, A. Vasanelli, et al.. Highly coherent phase-lock of an 8.1 μ m quantum cascade laser to a turn-key mid-IR frequency comb. Applied Physics Letters, 2023, 122 (23), pp.231102. ⟨10.1063/5.0152013⟩. ⟨hal-04193002⟩
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