材料科学
光电子学
垂直腔面发射激光器
激光器
光学
炸薯条
电流密度
波长
半导体激光器理论
物理
半导体
电信
计算机科学
量子力学
作者
Jianwei Zhang,Xing Zhang,Hongbo Zhu,Jian Zhang,Yongqiang Ning,Qin Li,Sheng Wang
出处
期刊:Optics Express
[The Optical Society]
日期:2015-05-27
卷期号:23 (11): 14763-14763
被引量:29
摘要
We report on the design and fabrication of 894.6nm vertical-cavity surface-emitting lasers (VCSELs) with extremely low threshold at high temperatures, for use in chip-scale Cs atomic clocks. A new design method based on the analysis of the threshold gain and the desired carrier density for different active region structures was proposed to gain the low transparent current density. The increase of the threshold current at higher temperatures was successfully suppressed by introducing the large gain-cavity detuning of VCSEL. By detuning the gain-cavity mode to be -11nm, the minimum threshold current of only 0.23mA at 70 °C was achieved. The operating temperature for emitting the wavelength of 894.6nm was 110 °C, with the single mode suppression ratio (SMSR) of more than 25dB and the threshold current of only 0.32mA.
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