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Date
2021Type
- Conference Paper
ETH Bibliography
yes
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Abstract
Semiconductor lasers with ultra-low thresholds and minimal footprints are a topic of active research. Such devices require a combination of high quality factor laser cavities with small active region volumes. For high-reflectivity coated ridge lasers, a low threshold can only be achieved by strongly reducing the diffraction losses arising at the laser facet. We show here that, somewhat counter-intuitively, opening a carefully designed aperture in a metallic facet coating can simultaneously enhance both its transmission and modal reflectivity by correcting the phase front at the subwavelength scale. Numerical simulations and experimental results demonstrate a reduction of optical mirror loss by up to 40% while the transmission is increased by four orders of magnitude. Applying this approach to both facets of a short cavity quantum cascade laser, we achieve laser operation at room temperature with an electrical dissipation of only 143 mW. Show more
Publication status
publishedExternal links
Book title
2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)Pages / Article No.
Publisher
IEEEEvent
Organisational unit
03759 - Faist, Jérôme / Faist, Jérôme
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ETH Bibliography
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