THz QCL combs under strong RF injection: temporal dynamics and harmonic states

Giacomo Scalari; Andres Forrer; Urban Senica; Sara Cibella; Guido Torrioli; Paolo Micheletti; Mattias Beck; Jerome Faist

doi:10.1117/12.2606770

9 March 2022 THz QCL combs under strong RF injection: temporal dynamics and harmonic states

Giacomo Scalari, Andres Forrer, Urban Senica, Sara Cibella, Guido Torrioli, Paolo Micheletti, Mattias Beck, Jerome Faist

Author Affiliations +

Proceedings Volume PC12021, Novel In-Plane Semiconductor Lasers XXI; PC120210B (2022) https://doi.org/10.1117/12.2606770
Event: SPIE OPTO, 2022, San Francisco, California, United States

Abstract

In this work present high performance QCL-based THz combs operating on fundamental and harmonic comb states operating up to 110 K in the spectral region from 2 to 4 THz . We employ double-metal, Copper- based laser resonators planarized with a polymer allowing high performance with CW operation up to 118 K . Such waveguide layout allows as well optimized RF coupling facilitating injection of high RF power. We analyze the laser emission by means of SWIFTS technique employing an Hot-Electron-Bolometer based on NbN. Different regimes are observed as the RF injection power is increased, going from FM emission to a pure AM. Spectral bandwidths as large as 700 GHz are observed corresponding to a fully coherent laser operation. For specific waveguide geometries and injection conditions pulses as short as 4 ps are observed. We present as well SWIFTS measurements for THz QCL combs operating on harmonic states under RF injection at the harmonic frequency of 17.6 GHz.

Conference Presentation

Citation Download Citation

Giacomo Scalari, Andres Forrer, Urban Senica, Sara Cibella, Guido Torrioli, Paolo Micheletti, Mattias Beck, and Jerome Faist "THz QCL combs under strong RF injection: temporal dynamics and harmonic states", Proc. SPIE PC12021, Novel In-Plane Semiconductor Lasers XXI, PC120210B (9 March 2022); https://doi.org/10.1117/12.2606770

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available