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采用金属有机化合物气相淀积(MOCVD)方法成功地研制了具有两对梯度折射率(GRIN)异质结构的InGaAs/AlGaAs应变双量子阱激光器。该器的波长为970-982nm,室温连续工作阈值电流密度为140A/cm^2,工作在0.9A时单面连续输出光功率为520mW,工作在2.0时,连续输出光功率为1.49W,最高功率可达2.4W,微分量子效率高达0.83W/A。 相似文献
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将输出光谱包络合理近似为高斯型,以高斯算法为基础,利用计算机软件编写了激光器阵列光谱合成模拟软件,实现了对激光器阵列合成波长、半高宽以及光谱图形的模拟。结果表明:用软件进行光束合成的激光器阵列波长与实际测试的波长基本吻合,但存在一定误差。基于这种情况,对模拟结果和实测结果的误差部分进行分析实验,以验证误差分析的正确性,并将误差重新编写到软件。该模拟软件可以在激光器组装阵列之前对激光器单条进行筛选,找出符合组成阵列波长要求的最佳激光器单条,使得实际生产出的激光器阵列波长与阵列的设计波长基本一致。 相似文献
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Liquid crystal in a nematic liquid crystal cell surface with two crossed-grating surface substrates can be oriented along the normal grating direction with given geometric parameters of groove and anchoring strength. This display is equivalent to multi-domain vertical-alignment mode. It has a relatively wide viewing angle. In this letter, we investigate the viewing angle characteristics of this kind of cell. The viewing angle dependence of contrast ratio is obtained using the extended Jones matrix method, which also considers the flexoelectric effect. The viewing angle is dependent on the geometric parameter of grating surface, the flexoelectric coefficients, and the anchoring strength. Therefore, appropriate value for each factor needs to be selected to obtain a better viewing angle of this cell. 相似文献
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采用一种新的液相外延工艺,研制出具有大光腔结构的V型槽衬底内条形可见光发射半导体激光器,其光谱波长为779-784nm,室温连续工作阈值电流为60mA,具有2倍阈值的基模工作时,线性输出光功率可达8mW,4mW下工作寿命已超过3000小时。 相似文献
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941nm2%占空比大功率半导体激光器线阵列 总被引:4,自引:3,他引:1
计算了半导体激光器的激射波长与量子阱宽度以及有源层中In组分的关系,确定了941nm波长的量子阱宽度和In组分.并利用金属有机化合物气相淀积(MOCVD)技术生长了InGaAs/GaAs/AlGaAs分别限制应变单量子阱激光器材料.利用该材料制成半导体激光器线阵列的峰值波长为940.5 nm,光谱的FWHM为2.6 nm,在400 μs,50 Hz的输入电流下,输出峰值功率达到114.7 W(165 A),斜率效率高达0.81 W/A,阈值电流密度为103.7 A/cm2;串联电阻5 mΩ,最高转换效率可达36.9%. 相似文献
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The director in nematic liquid crystal cell with a weak anchoring grating substrate and a strong anchoring planar substrate is relative to the coordinates x and z. The influence of the surface geometry of the grating substrate in the cell on the director profile is numerically simulated using the two-dimensional finite-difference iterative method under the condition of one elastic constant approximation and zero driven voltage. The deepness of groove and the cell gap affect the distribution of director. For the relatively shallow groove and the relatively thick cell gap, the director is only dependent on the coordinate z. For the relatively deep groove and the relatively thin cell gap, the director must be dependent on the two coordinates x and z because of the increased elastic strain energy induced by the grating surface. 相似文献