多量子阱电吸收调制DFB激光器的一种新型LP-MOCVD对接生长方法

提出了一种提高多量子阱电吸收调制DFB-LD集成器件（EML）耦合效率的对接生长方法。采用LP-MOCVD外延方法，制作了对接方法不同的三种样片，通过扫描电镜研究它们的表面及对接界面形貌，发现新对接结构的样片具有更好的对接界面。制作出相应的三种EML管芯，从测量所得到的出光功率特性曲线，计算出不同对接方法下EML管芯的耦合效率和外量子效率。实验结果表明，这种对接生长方案，可以获得光滑的对界面，显著提高了激光器和调制器之间的耦合效率（从常规的17%提高到78％）及EML器件的外量子效率（从0.03mW/mA提高到0.15mW/mA)

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies