Continuous-wave GaAs/AlGaAs quantum cascade laser at 5.7 THz

IF 6.5 2区物理与天体物理 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Nanophotonics Pub Date : 2024-01-16 DOI:10.1515/nanoph-2023-0726

Mohammad Shahili, Sadhvikas J. Addamane, Anthony D. Kim, Christopher A. Curwen, Jonathan H. Kawamura, Benjamin S. Williams

引用次数: 0

Abstract

Design strategies for improving terahertz (THz) quantum cascade lasers (QCLs) in the 5–6 THz range are investigated numerically and experimentally, with the goal of overcoming the degradation in performance that occurs as the laser frequency approaches the Reststrahlen band. Two designs aimed at 5.4 THz were selected: one optimized for lower power dissipation and one optimized for better temperature performance. The active regions exhibited broadband gain, with the strongest modes lasing in the 5.3–5.6 THz range, but with other various modes observed ranging from 4.76 to 6.03 THz. Pulsed and continuous-wave (cw) operation is observed up to temperatures of 117 K and 68 K, respectively. In cw mode, the ridge laser has modes up to 5.71 THz – the highest reported frequency for a THz QCL in cw mode. The waveguide loss associated with the doped contact layers and metallization is identified as a critical limitation to performance above 5 THz.

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5.7 太赫兹连续波砷化镓/砷化镓量子级联激光器

通过数值和实验研究了改进 5-6 太赫兹量子级联激光器（QCL）的设计策略，目的是克服激光频率接近雷斯特拉伦波段时出现的性能下降问题。我们选择了两种针对 5.4 THz 的设计：一种经过优化，功率耗散更低，另一种经过优化，温度性能更好。有源区显示出宽带增益，最强的模式在 5.3-5.6 太赫兹范围内发光，但观察到的其他各种模式在 4.76 至 6.03 太赫兹范围内。脉冲和连续波（cw）工作温度分别高达 117 K 和 68 K。在 cw 模式下，脊激光器的模式高达 5.71 THz --这是报道的 cw 模式下 THz QCL 的最高频率。与掺杂接触层和金属化相关的波导损耗被认为是限制 5 THz 以上性能的关键因素。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nanophotonics NANOSCIENCE & NANOTECHNOLOGY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

13.50

自引率

6.70%

发文量

358

审稿时长

7 weeks

期刊介绍： Nanophotonics, published in collaboration with Sciencewise, is a prestigious journal that showcases recent international research results, notable advancements in the field, and innovative applications. It is regarded as one of the leading publications in the realm of nanophotonics and encompasses a range of article types including research articles, selectively invited reviews, letters, and perspectives. The journal specifically delves into the study of photon interaction with nano-structures, such as carbon nano-tubes, nano metal particles, nano crystals, semiconductor nano dots, photonic crystals, tissue, and DNA. It offers comprehensive coverage of the most up-to-date discoveries, making it an essential resource for physicists, engineers, and material scientists.