Wavelength selection and spectral narrowing of distributed Bragg reflector quantum cascade lasers up to peak optical power

Arash Sadeghi, Peter Q. Liu, Xiaojun Wang, Jenyu Fan, Mariano Troccoli, Claire F. Gmachl

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

We investigate the impact of Distributed Bragg Reflectors (DBR), ion-milled directly on top of Fabry-Perot type Quantum Cascade (QC) laser ridges, following fabrication and processing of the devices and observe a more than 10-fold reduction in spectral full-width-half-maximum (FWHM) and a maximum of 20dB side-mode suppression ratio (SMSR), maintained to peak optical power. As predicted by our model, and experimentally verified, there is a "sweet-spot" in terms of grating length, ~200 μm on a 3 mm long laser ridge, and a trade-off between spectral narrowing and output power, set by the grating depth, varied from 1.8 to 2.5 μm.

Original languageEnglish (US)
Pages (from-to)31012-31018
Number of pages7
JournalOptics Express
Volume21
Issue number25
DOIs
StatePublished - Dec 16 2013

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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