Suppression of pointing instability in quantum cascade lasers by transverse mode control

Pierre M. Bouzi, Peter Q. Liu, Nyan Aung, Xiaojun Wang, Jen Yu Fan, Mariano Troccoli, Claire F. Gmachl

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

We report on a technique that serves to eliminate pointing instability in Quantum Cascade lasers by suppressing the propagation of higher order transverse modes within the laser cavity. This process, achieved via a short and lossy lateral constriction in the waveguide, only allows the fundamental mode to propagate. The beam pointing fluctuations of the modified devices are greatly reduced, with a 10-fold improvement in standard deviation, indicating a stable emitted beam. The far-field pattern has a Gaussian shape, and the slope efficiency of the received power on a 0.87 numerical aperture detector increases by ∼65, without significant increase in threshold.

Original languageEnglish (US)
Article number122105
JournalApplied Physics Letters
Volume102
Issue number12
DOIs
StatePublished - Mar 25 2013

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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