August 30, 2021 to September 3, 2021
University of Innsbruck
Europe/Zurich timezone

【417】Ultra-low threshold lasing through phase front engineering via a metallic circular aperture

Aug 31, 2021, 6:00 PM
Room E

Room E

Talk Atomic Physics and Quantum Optics Atomic Physics and Quantum Optics


Zhixin Wang (ETH Zurich)


Semiconductor lasers with ultra-low thresholds and minimal footprints are of great interest. For high-reflectivity-coated ridge-lasers, a low threshold can only be achieved by suppressing the diffraction losses arising at laser facets. We show that, counter-intuitively, opening a carefully designed aperture in a metallic facet coating can simultaneously enhance both its transmission and modal reflectivity by phase-front correction at subwavelength scale. Simulations and experimental results demonstrate a reduction of optical mirror loss by 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.

Primary authors

Zhixin Wang (ETH Zurich) Filippos Kapsalidis Ruijun Wang Mattias Beck Jérôme Faist

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