Low threshold lasing of GaN-based vertical-cavity surface-emitting lasers with thin InGaN/GaN quantum well active region

IF 4.6 2区物理与天体物理 Q1 OPTICS Optics and Laser Technology Pub Date : 2024-11-14 DOI:10.1016/j.optlastec.2024.112117

Rongbin Xu , Keisei Shibata , Hidefumi Akiyama , Jiazhe Zhang , Leiying Ying , Baoping Zhang

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Abstract

We studied the mechanism of low-threshold lasing of InGaN/GaN double quantum well (DQW) vertical-cavity surface-emitting lasers (VCSELs) showing a low threshold energy density of about 0.37mJ/cm² via optical pumping at room temperature (RT). The QW with thin well (2.5 nm) and barrier (6 nm) led to the stronger carrier localization effect and weaker quantum confined Stark effect (QCSE). Temperature-dependent photoluminescence (TDPL) and time-resolved photoluminescence (TRPL) were employed on half-cavity samples (VCSEL without top distributed Bragg reflector) to study the carrier dynamics in VCSEL microcavity. Compared with epitaxial layer, half-cavity samples showed the higher turning point temperature of TDPL peak energy, and the carrier lifetime measured by TRPL was shorter. The experimental results suggest that the stronger localization effect of thin QW and the strong coupling of QW and internal optical field can contribute to the low-threshold lasing of GaN-based VCSELs.

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具有薄 InGaN/GaN 量子阱有源区的氮化镓基垂直腔表面发射激光器的低阈值激光器

我们研究了 InGaN/GaN 双量子阱（DQW）垂直腔面发射激光器（VCSEL）在室温（RT）下通过光泵浦实现约 0.37mJ/cm2 低阈值能量密度的低阈值激光机制。具有薄阱（2.5 nm）和势垒（6 nm）的 QW 可产生较强的载流子局域效应和较弱的量子约束斯塔克效应（QCSE）。在半腔样品（不带顶部分布式布拉格反射器的 VCSEL）上采用了温度依赖性光致发光（TDPL）和时间分辨光致发光（TRPL）来研究 VCSEL 微腔中的载流子动力学。与外延层相比，半腔样品的 TDPL 峰值能量转折点温度更高，TRPL 测得的载流子寿命更短。实验结果表明，薄 QW 更强的局域化效应以及 QW 与内部光场的强耦合有助于实现基于氮化镓的 VCSEL 的低阈值激光。

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来源期刊

Optics and Laser Technology 物理-光学

CiteScore

8.50

自引率

10.00%

发文量

1060

审稿时长

3.4 months

期刊介绍： Optics & Laser Technology aims to provide a vehicle for the publication of a broad range of high quality research and review papers in those fields of scientific and engineering research appertaining to the development and application of the technology of optics and lasers. Papers describing original work in these areas are submitted to rigorous refereeing prior to acceptance for publication. The scope of Optics & Laser Technology encompasses, but is not restricted to, the following areas: •development in all types of lasers •developments in optoelectronic devices and photonics •developments in new photonics and optical concepts •developments in conventional optics, optical instruments and components •techniques of optical metrology, including interferometry and optical fibre sensors •LIDAR and other non-contact optical measurement techniques, including optical methods in heat and fluid flow •applications of lasers to materials processing, optical NDT display (including holography) and optical communication •research and development in the field of laser safety including studies of hazards resulting from the applications of lasers (laser safety, hazards of laser fume) •developments in optical computing and optical information processing •developments in new optical materials •developments in new optical characterization methods and techniques •developments in quantum optics •developments in light assisted micro and nanofabrication methods and techniques •developments in nanophotonics and biophotonics •developments in imaging processing and systems