Open AccessWavelength selection and spectral narrowing of distributed Bragg reflector quantum cascade lasers up to peak optical power
Author(s) -
Arash Sadeghi,
Peter Q. Liu,
Xiaojun Wang,
Jen-Yu Fan,
Mariano Troccoli,
Claire F. Gmachl
Publication year - 2013
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.031012
Subject(s) - optics , full width at half maximum , distributed bragg reflector , materials science , laser , quantum cascade laser , distributed bragg reflector laser , grating , fiber bragg grating , spectral width , wavelength , optoelectronics , cascade , physics , chemistry , chromatography
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.