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

Author(s): Sadeghi, A; Liu, PQ; Wang, X; Fan, J; Troccoli, M; et al

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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.
Publication Date: 9-Dec-2013
Electronic Publication Date: 9-Dec-2013
Citation: Sadeghi, A, Liu, PQ, Wang, X, Fan, J, Troccoli, M, Gmachl, CF. (2013). Wavelength selection and spectral narrowing of distributed Bragg reflector quantum cascade lasers up to peak optical power. Optics Express, 21 (31012 - 31018. doi:10.1364/OE.21.031012
DOI: doi:10.1364/OE.21.031012
Pages: 31012 - 31018
Type of Material: Journal Article
Journal/Proceeding Title: Optics Express
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.



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