VCSEL with reticular electrode and larger emitting aperture and its optoelectronic characteristics

The enlargement of the emitting aperture is usually one of the important methods of increasing vertical- cavity surface-emitting laser （VCSEL） optical output power. However, in a VCSEL with a larger aperture, the inhomogeneity in the injected current often causes inhomogeneous or even no emission. To solve this problem and to increase VCSEL output power, as well as to improve its thermal characteristics, we develop a new type of injected VCSEL with a larger aperture and a reticular electrode, where the conventional circular injection electrode of the P side is turned into a reticular one, and the heat sink is on the N side. The tests of the new VCSEL show an improvement in homogeneity in not only the injected current but also the emission intensity. The optical output power is also considerably increased, and the device optoelectronic performance is improved.     

离子声孤子在不均匀等离子体中的传播特性

本文考虑了离子的有限温度和离子与中性分子的碰撞,讨论离子声孤子在电离导致的弱不均匀等离子体中的传播特性,得到自洽的非均匀浓度分布N(x),漂移速度分布V(x)和相应的孤子解,数值计算给出孤子幅度、速度、宽度随位置的变化,所得结果合理并与实验相符。 关键词：     

三苯甲烷染料的表面发光

用同步泵浦染料激光器与时间相关单光于计数技术相结合,测量了孔雀绿和结晶紫水溶液的表面发光。在激发波长为608nm时,除了观测到304nm二次谐波外,还观测到了由双光于吸收所产生的荧光。     

利用爆聚等离子体研究X光激光

对脉冲功率技术驱动的爆聚等离子体过程进行了物理分析,在5％的偏差范围内,得到了和数值计算结果相一致的近似解析公式。计算结果表明,功率在3—4TW,输出电能300—400KJ,技术指标类似PITHON的加速器可以使质量为200—400μg的Kr气爆聚压缩成高温等离子体柱。     

快速多阵列等离子体辐射测量系统

热辐射测量是聚变实验研究中标准的诊断系统之一，主要用来测量总辐射功率和辐射功率密度的空间分布。我们自行研制的多阵列等离子体辐射测量系统在2005年实验期间首次获得了实验结果。