共查询到18条相似文献,搜索用时 851 毫秒
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在生长Fe∶LiNbO3熔体中掺进摩尔分数x(Ru2O3) =0.1%和x(MgO)=1%、3%、7%,用提拉法生长镁钌铁铌酸锂(Mg ∶ Ru∶Fe∶LiNbO3)晶体.通过二波耦合光路,分别以红光(632.8 nm)、绿光(532 nm)和蓝光(476 nm)为光源测量晶体的全息存储性能.实验结果表明,在476 nm下,Mg∶Ru∶Fe∶LiNbO3晶体全息存储性能随着Mg离子掺杂浓度的增加而呈现逐渐增强的趋势,与其在红光和绿光下不同.研究了Mg离子掺杂浓度的增加使Mg∶Ru∶Fe∶LiNbO3晶体的蓝光全息存储性能增强的机理. 相似文献
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研究光折变多重全息图分批热固定方法.依据热固定的基本理论模型研究离子补偿后的全息电子光栅在分批记录和定影过程中的光擦除特点。引入批间光擦除时间常数对多重全息图分批热固定的批间擦除特性进行定量描述.给出了测量批间光擦除时间常数的实验方法.并测得实际品体的批间光擦除时间常数:研究结果表明,被记录光激发的已定影全息图的获陷电子对其离子光栅的屏蔽作用,使得多重全息光栅的各批间光擦除时间常数τF远大于每批内光栅间的擦除时间常数τE,实验结果与理论预期一致。证实了批间光擦除时间常数与批内光擦除时间常数的差异是采用分批存储热固定技术高效存储热固定高密度全息图的基本依据。 相似文献
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手性偶氮苯衍生物的光致变色和全息存储特性研究 总被引:5,自引:4,他引:5
研究了手性偶氮分子N-[4-(4-十二烷氧基苯基偶氮)苯甲酰]-L-谷氨酸(C12-Azo—L-Glu)掺杂聚合物薄膜的光致变色特性。利用C12-Azo-L-Glu掺杂聚甲基丙烯酸甲酯(PMMA)薄膜的可逆光致异构过程.以线偏振的氩离子激光(488nm)作抽运光和写入光,线偏振氦氖激光(632.8nm)作再现光和读出光.探讨了光致双折射和全息光学存储过程中.衍射信号强度与氩离子激光功率的关系。实验结果表明C12-Azo-L-Glu具有响应时间快、可擦重写、耐疲劳度高的特点,可用作实时存储材料。 相似文献
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In this paper, we investigate the trapping effects, of iron doped AlGaN/GaN HEMTs, before and after on-wafer 24 hour RF stress test. First, we study the trap centers responsible of the current collapse at different on-state bias and temperature conditions. Second, we investigate 24 hour RF stress effect on the trapping kinetics.By filling traps under off-state condition with high drain-source voltage, we have identified two prominent traps labelled E1 and E2 with activation energies of 0.7 eV and 0.6 eV under the conduction band, respectively. An increase of the amplitude of the trap centers E1 and E2 by 22.9% and 15.8% respectively is noticed during the RF stress. This result suggests that the degradation observed during RF stress might have induced a density increase of the traps involved in the E1 and E2 trap signatures responsible on the current collapse. 相似文献
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Diedrich F. Krause J. Rempe G. Scully M.O. Walther H. 《Quantum Electronics, IEEE Journal of》1988,24(7):1314-1319
Two experiments with single atoms are reviewed. In the first experiment, the interaction of a single Rydberg atom with a single mode of an electromagnetic field was investigated. The quantum collapse and revivals of the atomic inversion predicted by the Jaynes-Cummings model were demonstrated for the first time. In the second experiment, a single atomic ion stored in a radio-frequency trap was probed by resonance fluorescence. In the fluorescent light, antibunching and sub-Poissonian photon statistics were detected. Furthermore, `crystallization' and `evaporation' of few ions in a trap were observed as the stored ions were cooled by the laser light and heated by the radio-frequency field of the trap 相似文献
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正The fabrication of AlGaN/GaN double-channel high electron mobility transistors on sapphire substrates is reported.Two carrier channels are formed in an AlGaN/GaN/AlGaN/GaN multilayer structure.The DC performance of the resulting double-channel HEMT shows a wider high transconductance region compared with single-channel HEMT. Simulations provide an explanation for the influence of the double-channel on the high transconductance region.The buffer trap is suggested to be related to the wide region of high transconductance.The RF characteristics are also studied. 相似文献
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The fabrication of AlGaN/GaN double-channel high electron mobility transistors on sapphire substrates is reported. Two carrier channels are formed in an AlGaN/GaN/AlGaN/GaN multilayer structure. The DC performance of the resulting double-channel HEMT shows a wider high transconductance region compared with single-channel HEMT. Simulations provide an explanation for the influence of the double-channel on the high transconductance region. The buffer trap is suggested to be related to the wide region of high transconductance. The RF characteristics are also studied. 相似文献