Wetting-layer-pumped continuous-wave surface emitting quantum dot laser
Wetting-layer-pumped continuous-wave surface emitting quantum dot laser
复制标题
润湿层泵浦连续波表面发射量子点激光器
DOI：
10.1117/12.906192
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Kbashi H
中科院分区：
文献类型：
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作者：
Kbashi H
报道了一种基于InAs Sttranski-Krastanov量子点（SK-QD）的1 μm连续激光器。该激光器相对于吸收的泵浦功率的斜率效率被测量为56%与润湿层泵浦，1.75倍大于当用830 nm的光吸收到SK-量子点层之间的障碍泵浦。与势垒泵浦相比，润湿层泵浦受益于较小的量子缺陷，在有源区中沉积较少的热，代价是薄（~1 nm）润湿层中较弱的泵浦吸收。在光抽运增益结构上放置50 μm厚的金刚石腔内散热片，势垒抽运增益结构的输出功率提高了10倍，最高可达2.25W。一个小得多的2倍增加功率，最大为0.35 W，被视为润湿层泵浦的情况下。金刚石散热器是更有效地从有源区，它是通过势垒泵浦沉积，比从衬底，它吸收残留的泵浦辐射在势垒泵浦的情况下，在去除热量。具有双周期DBR以背反射泵浦辐射的增益样本将允许实现润湿层泵浦的全部潜力，这既通过增加由于通过有源区的双通而引起的泵浦吸收，又通过将热生成局部化在有源区中。
We report a continuous wave 1 μm laser based on InAs Stranski-Krastanov quantum dots (SK-QD) which is optically pumped on a wetting layer absorption band at 915 nm. The slope efficiency of this laser relative to absorbed pump power was measured to be 56% with wetting layer pumping, 1.75 times larger than when pumped with 830 nm light absorbed into the barriers between the SK-QD layers. Compared to barrier pumping, wetting layer pumping benefits from a smaller quantum defect, with less heat deposited in the active region, at the expense of weaker pump absorption in the thin (~1 nm) wetting layer. When a 50 μm thick intracavity diamond heatspreader was contacted to the optically pumped gain structure, a 10-fold increase in output power, up to 2.25W, was obtained in the barrier pumped case. A much smaller 2-fold increase in power, to a maximum of 0.35 W, was seen for the wetting layer pumped case. The diamond heatspreader is more effective in removing heat from the active region, where it is deposited by barrier pumping, than from the substrate, which absorbs residual pump radiation in the barrier pumping case. A gain sample with a doubly periodic DBR to back reflect pump radiation, will allow the full potential of wetting layer pumping to be realised, both by increasing pump absorption due to the double pass through the active region, and by localising heat generation in the active region.