Fully phase-stabilized quantum cascade laser frequency comb

Luigi Consolino (), Malik Nafa, Francesco Cappelli, Katia Garrasi, Francesco P. Mezzapesa, Lianhe Li, A. Giles Davies, Edmund H. Linfield, Miriam S. Vitiello, Paolo De Natale and Saverio Bartalini
Additional contact information
Luigi Consolino: CNR-Istituto Nazionale di Ottica and LENS, Via N. Carrara 1
Malik Nafa: CNR-Istituto Nazionale di Ottica and LENS, Via N. Carrara 1
Francesco Cappelli: CNR-Istituto Nazionale di Ottica and LENS, Via N. Carrara 1
Katia Garrasi: NEST, CNR—Istituto Nanoscienze and Scuola Normale Superiore, Piazza S. Silvestro 12
Francesco P. Mezzapesa: NEST, CNR—Istituto Nanoscienze and Scuola Normale Superiore, Piazza S. Silvestro 12
Lianhe Li: University of Leeds
A. Giles Davies: University of Leeds
Edmund H. Linfield: University of Leeds
Miriam S. Vitiello: NEST, CNR—Istituto Nanoscienze and Scuola Normale Superiore, Piazza S. Silvestro 12
Paolo De Natale: CNR-Istituto Nazionale di Ottica and LENS, Via N. Carrara 1
Saverio Bartalini: CNR-Istituto Nazionale di Ottica and LENS, Via N. Carrara 1

Nature Communications, 2019, vol. 10, issue 1, 1-7

Abstract: Abstract Miniaturized frequency comb sources across hard-to-access spectral regions, i.e. mid- and far-infrared, have long been sought. Four-wave-mixing based Quantum Cascade Laser combs (QCL-combs) are ideal candidates, in this respect, due to the unique possibility to tailor their spectral emission by proper nanoscale design of the quantum wells. We demonstrate full-phase-stabilization of a QCL-comb against the primary frequency standard, proving independent and simultaneous control of the two comb degrees of freedom (modes spacing and frequency offset) at a metrological level. Each emitted mode exhibits a sub-Hz relative frequency stability, while a correlation analysis on the modal phases confirms the high degree of coherence in the device emission, over different power-cycles and over different days. The achievement of fully controlled, phase-stabilized QCL-comb emitters proves that this technology is mature for metrological-grade uses, as well as for an increasing number of scientific and technological applications.

Date: 2019
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DOI: 10.1038/s41467-019-10913-7

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