Monolithic beam combining of quantum cascade laser by evanescent coupling
type: Dataset
description: During the last 10 years, the quantum cascade lasers performances in the mid-infrared have been considerably improved: the wall plug efficiency has reached values superior to 20%, with output power up to 5W in continuous wave operation, at room temperature. Those values have been achieved due to the reduction of the temperature sensibility of the lasers, with characteristic temperature T0 reaching 300K. The output power is now limited to the injected power, which is proportional to the gain region size. This thesis reports an innovating solution consisting on beam combining an array of narrow emitters, monolithically. We experimentally demonstrate for the first time devices of up to 32 emitters of 2µm width emitting in phase by evanescent coupling. Moreover, we show record thermal resistance. Those results highlight the possibility to fabricate high power sources (superior to 10 W) in the mid-infrared, with a good beam quality.
landing page: https://theses.hal.science/tel-00829111
identifier: NNT: 2012PA112423
keyword: coherent-beam-combining
keyword: combinaison-coherente
keyword: infoeu-reposemanticsdoctoralthesis
keyword: lasers-a-cascade-quantiques
keyword: lasers-semiconducteurs
keyword: mid-infrared
keyword: mise-en-phase
keyword: moyen-infrarouge
keyword: phase-locking
keyword: physcondcm-genphysics-physicscondensed-matter-cond-matother-cond-matother
keyword: quantum-cascade-lasers
keyword: semiconductor-lasers
keyword: theses
issued: 2026-05-10T21:58:40.078938
modified: 2026-05-10T21:58:40.078942
language: fr
contact point: Organization
  fn: CCSD

test_moissonnage_selune
type: Agent

Monolithic beam combining of quantum cascade laser by evanescent coupling
type: Distribution
format: HTML
access URL: https://theses.hal.science/tel-00829111
issued: 2026-05-10T21:58:40.084079
modified: 2026-05-10T21:58:40.066472