Grating duty-cycle induced enhancement of substrate emission from ring cavity quantum cascade lasers

Clemens Schwarzer, Elvis Mujagić, Sang Il Ahn, Aaron Maxwell Andrews, Werner Schrenk, William Charles, Claire F. Gmachl, Gottfried Strasser

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

We report on experimental and theoretical investigation of grating parameters to promote one specific emission direction from ring-cavity quantum cascade lasers. The devices show single-mode behavior at room temperature and pulsed operation. A maximized surface output power was found for grating duty cycles around 70%, while for substrate emission, the optimized grating duty cycle is ≈50%. All tested devices emit more power through the substrate, when accounting for absorption and the reflection at the substrate air interface.

Original languageEnglish (US)
Article number191103
JournalApplied Physics Letters
Volume100
Issue number19
DOIs
StatePublished - May 7 2012

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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