Mid-infrared quantum cascade laser frequency combs with a microstrip-like line waveguide geometry
Abstract
In this work, a design for a mid-infrared quantum cascade laser frequency comb source that enhances the high frequency response and the comb characteristics of the device is presented. A state-of-the-art active region, grown on a heavily n-doped InP:Si substrate, was processed into a buried heterostructure with a microstrip-like line waveguide. As a result, the repetition rate frequency frep, around 11.09 GHz, can be locked to an injected narrow-linewidth radio frequency (RF) signal, over a range of more than 200 kHz with an injected power of −10 dBm, which outperforms normal buried heterostructure schemes by an order of magnitude. Moreover, under RF injection at powers higher than 20 dBm, the lasing spectrum is flattened and significantly broadened, from 24 cm−1 to 65 cm−1 in bandwidth, while at the same time, the coherence of the comb is maintained and verified. Mehr anzeigen
Persistenter Link
https://doi.org/10.3929/ethz-b-000472071Publikationsstatus
publishedExterne Links
Zeitschrift / Serie
Applied Physics LettersBand
Seiten / Artikelnummer
Verlag
American Institute of PhysicsOrganisationseinheit
03759 - Faist, Jérôme / Faist, Jérôme
03759 - Faist, Jérôme / Faist, Jérôme
02205 - FIRST-Lab / FIRST Center for Micro- and Nanoscience