Multitype Quantum Well Semiconductor Membrane External-Cavity Surface-Emitting Lasers for Widely Tunable Continuous Wave Operation,ACS Photonics

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Multitype Quantum Well Semiconductor Membrane External-Cavity Surface-Emitting Lasers for Widely Tunable Continuous Wave Operation
ACS Photonics ( IF 6.5 ) Pub Date : 2024-08-25 , DOI: 10.1021/acsphotonics.3c01801
Patrik Rajala ₁ , Philipp Tatar-Mathes ₁ , Hoy-My Phung _{1,

2} , Jesse Koskinen ₁ , Sanna Ranta ₁ , Mircea Guina ₁ , Hermann Kahle _{1,

3}

Affiliation

Membrane external-cavity surface-emitting lasers (MECSELs) represent a cutting-edge approach in pushing the performance boundaries of vertically emitting semiconductor lasers. The fundamental concept of employing an extremely thin gain membrane, spanning from hundreds of nanometers to a few micrometers in thickness and sandwiched between transparent heat spreaders, introduces novel opportunities through uniform double-sided optical pumping and enhanced heat dissipation from the active region. Additionally, these advantages of MECSELs facilitate more intricate band gap engineering possibilities for the active region by integrating multiple types of quantum wells (QWs) into a single laser gain structure. This work introduces a novel design strategy for laser gain structures incorporating various QW types. The objective is to achieve broad-spectrum gain with relatively high-power operation and potentially a flat spectral tuning range. Our design focuses on ensuring sufficient gain across a wide wavelength span, achieving uniform pump absorption, and limiting carrier mobility between different quantum well types during laser operation. We demonstrate a full-width half-maximum (FWHM) tuning range exceeding 70 nm (equivalent to more than 21.7 THz) with over 125 mW of output power across this entire tuning range at room temperature.

中文翻译：

用于宽范围可调谐连续波操作的多类型量子阱半导体膜外腔表面发射激光器

膜外腔表面发射激光器 (MECSEL) 代表了突破垂直发射半导体激光器性能极限的尖端方法。采用厚度从数百纳米到几微米并夹在透明散热器之间的极薄增益膜的基本概念，通过均匀的双面光泵浦和增强有源区域的散热带来了新的机会。此外，MECSEL 的这些优点通过将多种类型的量子阱 (QW) 集成到单个激光增益结构中，促进了有源区域更复杂的带隙工程可能性。这项工作介绍了一种结合各种 QW 类型的激光增益结构的新颖设计策略。目标是通过相对高功率的操作和潜在的平坦光谱调谐范围来实现广谱增益。我们的设计重点是确保在很宽的波长范围内有足够的增益，实现均匀的泵浦吸收，并限制激光操作期间不同量子阱类型之间的载流子迁移率。我们展示了超过 70 nm（相当于超过 21.7 THz）的全宽半高 (FWHM) 调谐范围，在室温下整个调谐范围内的输出功率超过 125 mW。

更新日期：2024-08-25

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