F. Mauerhoff, H. Wenzel, A. Maaßdorf, D. Martin, K. Paschke, G. Tränkle
Opt. Quant. Electron., vol. 56, no. 3, art. 419, doi:10.1007/s11082-023-06028-5 (2024).
The rapid advancement of 9Be+ ion-based quantum computing is creating a high demand for scalable and specialized laser sources. For this purpose, laser radiation at 313 nm is necessary which is generated by frequency doubling of 626 nm laser emission. Laser sources in this spectral region lack simplicity and need to be miniaturized. We carry out a systematic improvement of room temperature semiconductor laser structures emitting at 626 nm. They are based on a GaInP single quantum well embedded in AlGaInP grown on GaAs. We first investigate the structure theoretically and determine its limits and optima. We select the three most promising quantum well combinations, which are grown by metal-organic vapor-phase epitaxy. Furthermore, we fabricate broad-area lasers with dimensions of 1600 µm × 100 µm. All structures show laser operation around 626 nm. We are able to achieve a threshold current density of 721 A/cm2, a slope of 0.384 mW/mA and total maximum output power of 708 mW under pulsed excitation. Based on these results, we believe that quantum computing focusing on beryllium ions will highly benefit from these results.
Ferdinand-Braun-Institut, Gustav-Kirchhoff-Str. 4, 12489 Berlin, Germany
626 nm, Broad area laser, 9Be+ ion qubits, High power
Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
Full version in pdf-format.