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GaN-based bipolar cascade lasers with 25 nm wide quantum wells

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In good agreement with measurements, self-consistent numerical simulations are utilized to analyze internal device physics, performance limitations, and optimization options for a unique laser design with multiple active regions separated by tunnel junctions, featuring surprisingly wide InGaN quantum wells. Contrary to common assumptions, these quantum wells are revealed to allow for perfect screening of the strong built-in polarization field, while optical gain is provided by higher quantum levels. However, internal absorption, low p-cladding conductivity, and self-heating are shown to strongly limit the laser performance.

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The contribution of G.M., M.S., and C.S was supported by funding from Narodowe Centrum Nauki (2019/35/D/ST3/03008), Narodowe Centrum Badan i Rozwoju (LIDER/35/0127/L9/17/NCBR/2018), and Fundacja na rzecz Nauki Polskiej (TEAMTECHPOIR.04.04.00-00-210C/16-00).

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This article is part of the Topical Collection on Numerical Simulation of Optoelectronic Devices.

Guest edited by Slawek Sujecki, Asghar Asgari, Donati Silvano, Karin Hinzer, Weida Hu, Piotr Martyniuk, Alex Walker and Pengyan Wen.

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Piprek, J., Muziol, G., Siekacz, M. et al. GaN-based bipolar cascade lasers with 25 nm wide quantum wells. Opt Quant Electron 54, 62 (2022).

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