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Widely Tunable Sampled-Grating DBR Laser
Kan Qiang,Zhao Lingjuan,Zhang Jing,Zhou Fan,Wang Baojun,Wang Lufeng,and Wang Wei
半导体学报 , 2005,
Abstract: The 3-section SG-DBR tunable laser is fabricated using an ion implantation quantum-well intermixing process.The over 30nm discontinuous tuning range is achieved with the SMRS greater than 30dB.
Effect on Reflectance Spectra of Al0.5Ga0.5As/AlAs Distributed Bragg Reflector by Temperature
温度对Al0.5Ga0.5As/AlAs分布布喇格反射器的反射谱影响

ZHENG Shu-wen,FAN Guang-han,LI Shu-ti,ZHANG Yong,SUN Hui-qing,
郑树文
,范广涵,李述体,章勇,孙惠卿

光子学报 , 2007,
Abstract: 采用光学传输矩阵理论对Al0.5Ga0.5As/AlAs材料分布布喇格反射器(DBR)进行理论研究,分析了-10℃到100℃的范围内,温度变化对不同DBR结构的反射光谱影响.结果表明:随着温度的升高,传统20周期DBR的反射光谱向长波长方向移动,速率约0.05 nm/℃,其中由线热膨胀系数带来的影响小于0.001 nm/℃.当传统DBR的周期数增大时,温度对DBR光谱反射率的影响在减小,同时DBR的反射谱峰值波长发生红移.为了降低温度对DBR反射光谱的影响,提出一种新型的复式DBR结构.分析指出:该复式DBR比传统DBR有更大的反射光谱半峰宽,基本能覆盖同温度的AlGaInP LED电致发光光谱,这对提高LED的出光效率有现实意义.
Frequency and wavelength tunable optical microwave source based on a distributed Bragg reflector self-pulsation laser
基于DBR结构自脉动激光器的波长及频率可变光微波源

Liu Yang,Sun Yu,Kong Duanhu,Wang Baojun,Bian Jing,An Xin,Zhao Lingjuan,Wang Wei,
刘扬
,孙瑜,孔端花,王宝军,边静,安欣,赵玲娟,王圩

半导体学报 , 2010,
Abstract: 首次报道了基于DBR结构自脉动激光器的波长及频率可变光微波源。该微波源可以或得1.87GHz至21.81GHz的微波信号同时可以获得1536.28nm至1538.73nm的波长调谐。
PP抗光氧老化纺粘非织物布的开发及其性能  [PDF]
纺织学报 , 2009,
Abstract: 利用ZN-P型紫外线耐气候试验机加速PP抗光氧老化纺粘布的老化过程,通过拉伸仪测试其老化实验前后的断裂强度和断裂伸长率,根据其损失率来判断抗光氧老化剂的种类、添加量及色母粒对所制备的PP纺粘布抗光氧老化性能的影响。结果表明,经阻胺类抗光氧老化剂改性的PP纺粘布,其抗光氧老化性能明显优于紫外线类抗光氧老化剂改性的PP纺粘布,当其质量分数为2%~2.2%时性价比最好。同时,色母粒的加入对PP纺粘布的抗光氧老化性能也有较大的影响。
拉曼放大布里渊光时域分析系统非局域效应  [PDF]
贾新鸿,饶云江,王子南,张伟利,冉曾令,邓坤,杨自新
强激光与粒子束 , 2012,
Abstract: ?应用包含探测光、布里渊泵浦光及拉曼泵浦光相互作用理论模型,数值分析了基于拉曼放大的长距离布里渊光时域分析仪非局域化特性。结果表明:非局域化随探测光及拉曼泵浦功率增加而恶化;通过频分复用(将具有不同布里渊频移的光纤拼接)及时分复用技术(同时对布里渊泵浦及探测光进行脉冲调制),可有效缩短布里渊泵浦与探测光的作用距离,达到较理想的抑制非局域效应结果。
Monolithic white LED based on AlxGaN1-x/InyGa1-yN DBR resonant-cavity
基于AlxGa1-xN/InyGa1-yN DBR谐振腔的单片集成白光LED

Chen Yu,Huang Lirong,Zhu Shanshan,
陈宇
,黄黎蓉,朱珊珊

半导体学报 , 2009,
Abstract: A monolithic white light-emitting diode (LED) with blue and yellow light active regions has been designed and studied. With the AlGaN/InGaN distributed Bragg reflector (DBR) resonant-cavity, the extraction efficiency and power of the yellow light are enhanced so that high quality white light can be obtained.
Influences of N-DBR and Double Oxide-confined Regions on the Characteristics of Electrical, Optical and Thermal Fields in VCSEL
N-DBR和双氧化限制层对VCSEL电、光、热特性的影响

Liu Lixin,Zhao Hongdong,Niu Hanben,
刘立新
,赵红东,牛憨笨

光子学报 , 2006,
Abstract: In this paper,a direct coupling theoretical model in quasi-three-dimension for the gain-wave guide Vertical-Cavity Surface-Emitting Laser (VCSEL) has been created.With the finite-difference method,self-consistent solutions for the injected current density, carrier concentration,optical field and thermal conduction equations are realized to study the characteristics of electrical,optical and thermal fields distribution in VCSEL.A VCSEL with double oxide-confined regions is introduced.The influences of N-DBR layers and double oxide-confined regions on the characteristics of VCSEL are analyzed contrastively.The calculation results show that if N-DBR layers are not considered,there must be some errors to the practical VCSEL.The results also indicate that the structure of double oxide-confined regions in VCSEL has been improved greatly the characteristics of lasers,and it provides a method of reducing threshold current and controlling high-order modes.
库布齐现代沙漠景观发育的沉积学及光释光年代学证据  [PDF]
范育新,陈晓龙,范天来,金明,刘建宝,陈发虎
中国科学 地球科学 中国科学 地球科学 , 2013,
Abstract: ?通过对库布齐沙漠5条南北向断面上的12个探坑和剖面的考察,分析了现代库布齐沙漠景观及下伏地层结构,发现该沙漠风沙沉积直接覆盖于冲洪积相/湖相沉积地层之上.石英的双单片再生法(DoubleSAR)光释光(OSL)测年结果表明,库布齐沙漠的西北部和东部地区最迟分别在距今19和9ka前后开始风沙堆积,在距今7ka风沙活动显著增强,特别是在距今2ka以来,沙漠向南和北扩展,现代库布齐沙漠景观开始形成.库布齐地区距今19,9和7ka前后的风沙堆积可能受到亚洲夏季风衰退的影响,距今2ka前后现代库布齐沙漠地貌景观的形成则更多地受到人类活动的触发.
Research on selective optical amplification of Brillouin spectrum of weak scattering signals in water
水中微弱光散射布里渊频谱选择性光放大研究

Gao Wei,Lü Zhi-Wei,He Wei-Ming,Zhu Cheng-Yu,Dong Yong-Kang,
高玮
,吕志伟,何伟明,朱成禹,董永康

物理学报 , 2007,
Abstract: 提出利用布里渊放大技术对水中微弱光散射信号进行频谱选择性光放大的方法.根据频率失谐布里渊放大理论模型,分析了Stokes种子光的线宽及频率失谐对布里渊放大的影响,研究了种子光放大率随水温及其功率密度变化的规律,理论和实验符合较好.研究表明,相同频率失谐时,线宽较大的种子光信号放大率更高.选取20℃的CS2为放大介质,不同温度海水产生的Stokes种子光信号均能得到有效的布里渊放大.相同抽运光功率密度情况下,种子光的放大率随其功率密度的增加而减小,当种子光能量约为5μJ时,其放大率达102以上.
乌兰布和北部地区沙漠景观形成的沉积学和光释光年代学证据  [PDF]
范育新,陈发虎,范天来,赵晖,杨丽萍
中国科学 地球科学 中国科学 地球科学 , 2010,
Abstract: ?雷达反射剖面和钻孔岩芯地层资料表明,乌兰布和北部流沙覆盖区的沙丘沙是覆盖在古湖沼相沉积层之上的.本文在3个沙丘/沙山中,通过钻探获得了完整的沉积记录,并对沙丘沙和沙丘底部的湖沼相砂层进行了光释光测年.研究结果表明,现今的乌兰布和沙漠北部流沙覆盖区的沙漠景观只是距今2ka以来逐渐形成的,并很可能是汉代以后大规模弃垦导致的土地荒芜的结果.
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