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Quantum-Dot Based Vertical External-Cavity Surface-Emitting Lasers With High Efficiency
IEEE Photonics Technology Letters ( IF 2.6 ) Pub Date : 2021-06-14 , DOI: 10.1109/lpt.2021.3089331
Tanja Finke , Vitalii Sichkovskyi , Johann Peter Reithmaier

We demonstrate an optically pumped vertical external-cavity surface-emitting laser (VECSEL) based on quantum dots (QDs) with a high optical gain. The photoluminescence (PL) emission of the QDs at the operating wavelength of 1030 nm has been optimized towards a high integrated intensity by using a dot density in the range of 10 11 cm −2 and a narrow PL linewidth of around 30 meV due to an improved size homogeneity. Additionally, post-growth rapid thermal annealing at 650 °C for 45 s was found to reduce the non-radiative recombination centers and further improve the output power efficiency. During this study, the number of QD layers, the heat sink temperature and the heat spreader material were analyzed. The best results with a record slope-efficiency of 35% and a maximum continuous-wave output power of 5.7 W could be achieved with an RTA treated QD based VECSEL containing 24 QD layers in the gain section. The laser was processed with a solder-based flip-chip bonding technique on a diamond heat sink and temperature stabilized at 4 °C. Furthermore, an excellent symmetric beam profile with M 2 = 1.12 was achieved.

中文翻译:

基于量子点的高效垂直外腔面发射激光器

我们展示了一种基于具有高光学增益的量子点 (QD) 的光泵浦垂直外腔面发射激光器 (VECSEL)。通过使用 10 11 cm -2范围内的点密度,QD 在 1030 nm 工作波长下的光致发光 (PL) 发射已针对高集成强度进行了优化 由于尺寸均匀性的提高,PL 线宽约为 30 meV。此外,发现在 650°C 下进行 45 秒的生长后快速热退火可以减少非辐射复合中心并进一步提高输出功率效率。在这项研究中,对 QD 层数、散热器温度和散热器材料进行了分析。使用 RTA 处理的基于 QD 的 VECSEL 在增益部分包含 24 个 QD 层,可以获得最佳结果,其斜率效率为 35%,最大连续波输出功率为 5.7 W。激光器在金刚石散热器上使用基于焊料的倒装芯片键合技术进行处理,温度稳定在 4°C。此外,还实现了 M 2 = 1.12的出色对称光束轮廓 。
更新日期:2021-06-25
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