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

doi:10.1364/OE.21.031012

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 journal › Article › peer-review

4 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 language	English (US)
Pages (from-to)	31012-31018
Number of pages	7
Journal	Optics Express
Volume	21
Issue number	25
DOIs	https://doi.org/10.1364/OE.21.031012
State	Published - Dec 16 2013

All Science Journal Classification (ASJC) codes

Atomic and Molecular Physics, and Optics

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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.",

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T1 - Wavelength selection and spectral narrowing of distributed Bragg reflector quantum cascade lasers up to peak optical power

AU - Sadeghi, Arash

AU - Liu, Peter Q.

AU - Wang, Xiaojun

AU - Fan, Jenyu

AU - Troccoli, Mariano

AU - Gmachl, Claire F.

PY - 2013/12/16

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AB - 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.

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

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