Share Email Print
cover

Proceedings Paper

Phase-locking of surface-emitting THz quantum cascade laser arrays
Author(s): Gangyi Xu; Yacine Halioua; Raffaele Colombelli; Suraj P. Khanna; Lianhe Li; Edmund H. Linfield; A. Giles Davies; Harvey Beere; David A. Ritchie
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

We first discuss and review a novel technique to obtain efficient surface-emission in terahertz quantum cascade lasers (THz-QCLs). We report high-power, single-mode surface-emission by using graded photonic heterostructures (GPH) as resonators. Peak output powers of ~100 mW and differential efficiency of 230mW/A are achieved at frequency ~ 3.4THz, the maximum operation temperature being 120K in pulsed mode. Combining with the active region based on the bound-to-continuum design, we also achieved continuous-wave (CW) operation of GPH THz QC lasers, with the maximum output power of 3.8 mW at 2.7THz. We then discuss the prospects to develop phase-locked arrays of these devices, in order to take advantage of their good wall-plug efficiency (<0.3%) and single-lobed directional beam pattern. As an initial result, a very robust approach to phase-lock second-order distributed feedback (DFB) THz QC laser arrays (pairs in this case) is demonstrated.

Paper Details

Date Published: 4 February 2013
PDF: 6 pages
Proc. SPIE 8631, Quantum Sensing and Nanophotonic Devices X, 86310F (4 February 2013); doi: 10.1117/12.2004125
Show Author Affiliations
Gangyi Xu, Institut d'Électronique Fondamentale, Univ. Paris Sud, CNRS (France)
Yacine Halioua, Institut d'Électronique Fondamentale, Univ. Paris Sud, CNRS (France)
Raffaele Colombelli, Institut d'Électronique Fondamentale, Univ. Paris Sud, CNRS (France)
Suraj P. Khanna, Univ. of Leeds (United Kingdom)
Lianhe Li, Univ. of Leeds (United Kingdom)
Edmund H. Linfield, Univ. of Leeds (United Kingdom)
A. Giles Davies, Univ. of Leeds (United Kingdom)
Harvey Beere, Cavendish Lab., Univ. of Cambridge (United Kingdom)
David A. Ritchie, Cavendish Lab., Univ. of Cambridge (United Kingdom)


Published in SPIE Proceedings Vol. 8631:
Quantum Sensing and Nanophotonic Devices X
Manijeh Razeghi, Editor(s)

© SPIE. Terms of Use
Back to Top