title: Wavelength selection and spectral narrowing of Distributed Bragg Reflector quantum cascade lasers up to peak optical power.
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.
authors: Arash
authors: A
authors: Sadeghi
authors: Peter Q
authors: PQ
authors: Liu
authors: Xiaojun
authors: X
authors: Wang
authors: Jenyu
authors: J
authors: Fan
authors: Mariano
authors: M
authors: Troccoli
authors: Claire F
authors: CF
authors: Gmachl