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51.
The technology of zinc-diffusion to improve catastrophic optical damage (COD) threshold of compressively strained GaInP/AlGaInP quantum well laser diodes has been introduced. After zinc-diffusion, about 20 μm-long region at each facet of laser diode has been formed to serve as the window of the lasing light. As a result, the COD threshold has been significantly improved due to the enlargement of bandgap by the zinc-diffusion induced quantum well intermixing, compared with that of the conventional non-window structure. 40-mW continuous wave output power with the fundamental transverse mode has been realized under room temperature for the 3.5μm-wide ridge waveguide diode. The operation current is 84 mA and the slope efficiency is 0.74 W/A at 40 mW. The lasing wavelength is 656 nm. 相似文献
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用转移矩阵方法研究了以Fibonacci序列排列的准周期超晶格的Plasmon-Polariton模,结果表明其谱总是处于“临界态”,(或称混沌态)。我们期望这种性质对各种物理可测量过程产生影响。 相似文献
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高秋娟徐云辉姜华狄世超贺永喜 《光学与光电技术》2021,19(4):80-85
为了满足在夜晚低照度环境下对鱼眼镜头的需求,利用ZEMAX光学软件设计出了一款适用于2 inch微光夜视相机的微光夜视鱼眼镜头。该结构包含窗口透镜,共由7组10片透镜组成,其中除窗口外,其余全部为光学玻璃,而且选用的玻璃材料均为常用、性能良好、价格便宜的牌号。有效焦距为9.5 mm,相对孔径为1/1.8,视场角为170°,像高为21mm,光学系统总长为90 mm,最大口径为56 mm,后工作距离为10.4 mm。在分辨率46 lp/mm处,全视场范围内的MTF值均大于0.36,全视场f-θ畸变量的绝对值小于30%,场曲小于0.15 mm,镜头有较好的成像质量。 相似文献
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针对个人室内定位中步长估计方法存在估计精度不高、适用范围有限的问题,提出一种采用表面肌电信号和加速度信息的改进步长估计模型.通过采集行人在行走过程中的表面肌电信号和加速度信息,利用平滑滤波算法对该信号进行预处理,并通过峰值检测算法进行步数检测,在此基础上提出一种改进的步长估计模型,利用该模型进行了个人室内定位测试.实验... 相似文献