Quantum communication is a new technology requiring a stable and reliable laser source for communication security.A new kind of polarization-locked vertical-cavity surface-emitting laser (VCSEL) with polarization maintaining (PM) fiber pigtail is fabricated as a decoy state laser source.The VCSEL is packaged in a standard butterfly box integrated with thermoelectric coder (TEC) and thermistor.The optical pulse width of full-width at half-maximum (FWHM) is smaller than 400 ps with a 100-MHz on/off modulation frequency.The results reveal that modulation range is better than 4.Moreover, the polarization is stable, and the power extinction ratio is larger than 25.The center wavelength is 850 nm, and the SMSR is better than 40 dB.

半导体激光器阵列（LDA）封装过程中引入的应力是影响器件阈值电流、光束特性和寿命的重要因素,需要一种简单有效的测试半导体激光器阵列应力的方法评估检测器件封装的质量。分析了应力改变电荧光偏振度（DOP）的一系列理论机制,并通过对条形激光器阵列在荧光条件下偏振特性的测量,研究了几种不同封装形式的条形激光器阵列的荧光偏振度随外加应力的变化性质。实验表明,半导体激光器阵列的偏振特性随驱动电流的增加变化明显,尤其是在阈值电流附近,偏振特性急剧变化。当有局部外力作用器件时,器件的荧光偏振度分布明显变化。通过对多个不同材料封装器件的荧光偏振度测试比较,发现不同的材料和封装形式对管芯引入的封装应力有明显的差别。

The steady state temperature distribution of the high power semiconductor laser array is simulated using Ansys software,and the temperature changes of the in-house made semiconductor laser array is tested.The results indicate that the simulation is well consisted with the experiments.The simulation results can guide the packaging of the high power semiconductor laser array.

根据固体激光器抽运的技术要求,设计了一种具有水冷装置的大功率半导体激光器二维阵列模块,并对半导体激光器热沉和致冷系统的热流进行了分析。在不同占空比下,对该模块进行了测试与分析。该模块的中心波长为810 nm,光谱半峰全宽（FWHM）为2.5 nm,工作电流为110 A（200μs,10%占空比）,循环水温为15℃时输出峰值功率为280 W。结果表明,该封装结构在占空比小于5%时器件工作特性良好,在10%占空比下也可正常工作。利用该模块可以组合成多种几何结构、功率更高的半导体激光器组件。

A wireless laser communication system with multiple transmitter and auto tracking is reported in this paper. The overall design, key optical and mechanical components, and servo control sub system are described including three laser transmitters at 800 nm, a beacon laser at 980 nm, optical detector, position sensitive detector, step motor and micro processor for auto tracking. In experiments over a span distance of 1 3 km, percentages of error free second were measured to be more than 98% for 155 Mb/s during 24 hour continuous operation, and 95% for 622 Mb/s in a period of 8 hours, and bit error rate of less than 10 -9 . It is shown that the scheme of multiple transmitter and auto tracking will improve the reliability of wireless laser communication systems.