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聚焦脉冲激光作用下Ge_2Sb_2Te_5薄膜晶化过程及机理

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无机材料学报 2002年第6期17卷 1245-1252页

作者：魏劲松阮昊干福熹中国科学院上海光学精密机械研究所上海201800

采用聚焦脉冲激光研究了Ge2Sb2Te5薄膜在沉积和激光淬火两种非晶态下反射率与激光脉冲宽度变化的关系,发现沉积态的Ge2Sb2Te5薄膜在晶化触发阶段内的反射率随激光脉冲宽度增加而减小,经过激光淬火的非晶态Ge2Sb2Te5薄膜在晶化触发阶段... 详细信息

采用聚焦脉冲激光研究了Ge2Sb2Te5薄膜在沉积和激光淬火两种非晶态下反射率与激光脉冲宽度变化的关系,发现沉积态的Ge2Sb2Te5薄膜在晶化触发阶段内的反射率随激光脉冲宽度增加而减小,经过激光淬火的非晶态Ge2Sb2Te5薄膜在晶化触发阶段内的反射率随激光脉冲宽度增加而变化平缓.本文借用气-液体系中过饱和度分析液滴形成的原理,从统计物理学角度详细研究了两种非晶态Ge2Sb2Te5薄膜在脉冲激光作用下的晶化过程及机理,结果表明,当Ge2Sb2Te5的非晶态程度处于未饱和或饱和状态时不形成晶核;当Ge2Sb2Te5的非晶态程度处于过饱和状态时,此时的Ge2Sb2Te5为亚稳态,可能形成大小不等的晶核,但只有半径大于临界晶核尺寸时才可能长大成晶粒.而应力降低晶化能垒,增加非晶态Ge2Sb2Te5的过饱和度是导致沉积态与激光淬火态的Ge2Sb2Te5薄膜在晶化触发阶段内反射率随激光脉冲宽度变化规律不一致的根本原因,并据此解释了Ge2Sb2Te5薄膜在这两种状态下的反射率随激光脉冲宽度的变化特点及规律.

关键词：聚焦脉冲激光晶化过程 Ge2Sb2Te5薄膜过饱和度晶化机理相变光储存

Maximum Likelihood Estimation of the Identification Parameters and Its Correction

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Journal of Systems Engineering and Electronics 2002年第4期13卷 31-38页

作者： An Kai, Ma Jiaguang & Fu Chengyu institute of optics and Electronics, chinese academy of sciences, Chengdu 610041, P. R. china institute of optics and Electronics Chinese Academy of Sciences Chengdu 610041 P. R. China

By taking the subsequence out of the input-output sequence of a system polluted by white noise, an independent observation sequence and its probability density are obtained and then a maximum likelihood estimation of the identification parameters is given. In order to decrease the asymptotic error, a corrector of maximum likelihood (CML) estimation with its recursive algorithm is given. It has been proved that the corrector has smaller asymptotic error than the least square methods. A simulation example shows that the corrector of maximum likelihood estimation is of higher approximating precision to the true parameters than the least square methods.

关键词： Probability density Noise Least square methods Corrector of maximum likelihood estimation.

The application of underwater optics and its development

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The application of underwater optics and its development

Computer Controlled Polishing of the Off-axis Aspheric Mirrors

2007亚洲光电子会议信息光学与光子学技术分会场

作者： LV Pei1 ,2, HE Junhua 1, Zhou Renkui1 , Liu Haiying1 ,2 1 xi’an institute of optics and precision mechanics of CAS, xi’an 710119, china 2 Graduate School of chinese Academic of sciences, Beijing 100039, china

After concluding the application of under-water optics, the development of under-water laser imaging technology is reviewed. The main types of laser imaging technology are introduced, such as laser scanning imaging, distance selected imaging, and three-dimensional technology. The respective imaging principle, characteristics and update status are presented. Furthermore, the newest detecting technology, such as fiber optic hydrophone, under-water holograph and under-water spectrum detecting technology are described in detail. The recent researching status and new application are included.

关键词： Underwater imaging laser scanning range gated selection polarized laser imaging holography detecting underwater laser communication

来源： cnki会议评论

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cnki会议

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光学精密工程 2001年第5期9卷 467-473页

作者： ZHANG Xue jun,WENG Zhi cheng,ZHANG Zhong yu, WANG Quan dou,ZHANG Feng (Changchun institute of optics, Fine mechanics and Physics, chinese academy of sciences, Changchun 130022, china) 中科院长春光学精密机械与物理所吉林长春 1 30 0 2 2

In this paper, the manufacturing and testing procedures to make large off-axis aspherical mirrors are presented. The difficulties in polishing and testing for both circular aperture and rectangular aperture mirrors are previewed, and a possible solution is given. The two mirrors have been polished by means of CCOS, and the final accuracy is 25nm rms for 770mm×210mm rectangular mirror and 20nm rms for φ600mm circular mirror. These results just meet the optical tolerances specified by the designer, and the manufacturing and testing procedures presented here show good ability to make the large off-axis aspherical mirrors.

关键词： asphere computer-controlled polishing optical testing

TeO_x和Ag-In-Sb-Te-O薄膜动态存储特性的测试

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中国激光 2003年第5期30卷 445-448页

作者：李青会顾冬红干福熹中国科学院上海光学精密机械研究所上海201800

采用真空蒸镀法制备了以TeOx 薄膜为记录层的可录光盘 ,采用溅射法制备了以Ag In Sb Te O为记录层的可擦重写光盘 ,并测试了这两种光盘在波长为 5 14 .5nm的动态存储特性。实验结果表明 ,可录光盘的载噪比在波长 5 14 5nm时达到 3 0dB ... 详细信息

采用真空蒸镀法制备了以TeOx 薄膜为记录层的可录光盘 ,采用溅射法制备了以Ag In Sb Te O为记录层的可擦重写光盘 ,并测试了这两种光盘在波长为 5 14 .5nm的动态存储特性。实验结果表明 ,可录光盘的载噪比在波长 5 14 5nm时达到 3 0dB ,波长 780nm时达到 41dB ;可擦重写光盘的载噪比在波长 5 14 5nm时达到 2 5dB ,波长 780nm时达到 3 8dB。对光盘载噪比偏低的可能原因及改进方法进行了讨论。光盘动态存储性能测试证明了这两种薄膜可用作蓝绿光波段高密度光存储介质。

关键词：信息光学光存储溅射法 TeOx薄膜 Ag-In-Sb-Te-O薄膜动态存储特性

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细菌视紫红质对调制光的响应特性

生物化学与生物物理进展 1997年第5期24卷 427-430页

作者：姚保利徐大纶侯洵胡坤生王敖金中国科学院西安光学精密机械研究所瞬态光学技术国家重点实验室西安710068 中国科学院生物物理研究所北京100101

细菌视紫红质在结构上与视紫红质的相似性使其具有某些视觉响应特性 .用电泳法在不锈钢电极上沉积出定向紫膜薄膜 ,构成不锈钢 /紫膜 /凝胶 /铜电极结构的光接收器 .在调制光作用下 ,光接收器显示出对光强变化的微分响应特性 .测量了光... 详细信息

细菌视紫红质在结构上与视紫红质的相似性使其具有某些视觉响应特性 .用电泳法在不锈钢电极上沉积出定向紫膜薄膜 ,构成不锈钢 /紫膜 /凝胶 /铜电极结构的光接收器 .在调制光作用下 ,光接收器显示出对光强变化的微分响应特性 .测量了光电压随调制频率和入射光功率的变化关系 .比较和讨论了细菌视紫红质对调制光响应特性与视觉频闪及明暗感的相关性 .

关键词：细菌视紫红质紫膜生物膜调制光

Birefrmgent laterally Sheared Beam Splitter - Savart polariscope

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Birefrmgent laterally Sheared Beam Splitter - Savart polaris...