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961.
Pengcheng Shi Jianguo Chen Lingxuan Qian Diyong Yan Jun Lei 《Optics & Laser Technology》2007,39(5):953-956
For a laser diode array (LDA) positioned in an external cavity of a certain length, a very strong inter-emitter coupling can be established between the off-axis lateral modes of the broad-stripe emitters. Under these circumstances, the phase-locked operation of the LDA due to couplings between off-axis modes of emitters has been observed, for the first time to our knowledge. The observations suggest that phase locking of a broad-stripe LDA can be achieved among different emitter lateral modes by selecting different cavity lengths. 相似文献
962.
963.
高功率宽调谐范围掺Yb3+光子晶体光纤激光器 总被引:1,自引:0,他引:1
采用闪耀光栅作为色散元件,构建了前向、后向输出两种结构的可调谐掺Yb3 光子晶体光纤激光器,并对其输出特性进行了分析研究.在抽运功率5.75W时,前向输出结构实现了1050.6~1110.2 nm的连续调谐输出,光谱线宽约0.1 nm,边模抑制比大于44 dB.在调谐激光波长为1085 nm时,得到最高输出功率677 mW.结构改进的后向输出结构的可调谐输出结构在抽运功率4.43 W,调谐波长1075 nm,实现了2.21 W的功率输出,斜率效率为73%;调谐范围50.9 nm(1042.1~1093 nm),光谱线宽小于0.08 nm,边模抑制比大于50 dB.两种结构的可调谐激光器输出均为线偏振光,偏振度大于89.5%. 相似文献
964.
965.
利用自恰tight-binding 理论,对由phenalenyl分子构成的全对称三电极纳米单分子器件的电子传导特性进行了理论研究. 通过改变电极与分子界面上的耦合,得出了分子与原子线电极间耦合强度变化对电子传输的影响. 结果显示电子通过phenalenyl分子器件的概率随着分子与电极的耦合强度变弱而减小. 当耦合强度变大时,不仅电子通过phenalenyl分子器件的概率变大,而且在较宽的能带内电子都可以通过phenalenyl分子. 所得结果还揭示出在特定的能区,对称三电极phenalenyl分子可以构成一个无源正负能量开关器件的新特性. 相似文献
966.
A novel long-lasting afterglow phosphor ZrO2:Ti is prepared by the conventional solid-stated method and their luminescent properties are investigated. A bluish white strong and broad emissive band, which is attributed to originate from the recombination of electrons trapped by F+ centers and the holes created in Valence band, is observed under 254 nm UV irradiation. The identical color long afterglow, which lasts about 1 h, is found in the ZrO2:Ti phosphor after removing the 254 nm UV light. The mechanism of the long lasting phosphorescence (LLP) has been discussed based on the thermoluminescence (TL) results. The replacement of Zr by Ti produces more anion vacancies, resulting in the enhanced photoluminescence (PL) and LLP of ZrO2:Ti sample. These results indicate that ZrO2:Ti phosphor has potential promising applications. 相似文献
967.
Lei Tian Pengfei Shi Jieying Wu Yufang Zhou Minghua Jiang 《Journal of luminescence》2007,127(2):423-430
The title compounds, several Schiff bases with D-π-D type have been successfully synthesized from reaction of 4-(N-dialkylamino) benzaldehyde and hydrazine or p-phenylenediamine in ethanol. These compounds were characterized by IR, 1H NMR, elemental analysis and electronspray mass spectrometry. One-photon fluorescence and two-photon fluorescence properties have been investigated. The two-photon absorption (TPA) cross section (σ) of these compounds was obtained by using the open-aperture Z-scan technique. Based on theoretical calculations and factual test, the influence that a series of substituted groups and the conjugated frame imposed on TPA cross section were systematically discussed. 相似文献
968.
969.
970.
Xitong Liu Wei Wang Zhenqiang Fan Wanning Huang Lixing Luo Canglei Yang Prof. Dr. Jing Zhang Prof. Dr. Jianfeng Zhao Prof. Dr. Lei Zhang Prof. Dr. Wei Huang 《Chemistry (Weinheim an der Bergstrasse, Germany)》2021,27(40):10448-10455
Fullerene host-guest constructs have attracted increasing attention owing to their molecular-level hybrid arrangements. However, the usage of simple carbazolic derivatives to bind with fullerenes is rare. In this research, three novel carbazolic derivatives, containing a tunable bridging linker and carbazole units for the capturing of fullerenes, are rationally designed. Unlike the general concave-convex interactions, fullerenes could interact with the planar carbazole subunits to form 2-dimensional hexagonal/quadrilateral cocrystals with alternating stacking patterns of 1 : 1 or 1 : 2 stoichiometry, as well as the controllable fullerene packing modes. At the meanwhile, good electron-transporting performances and significant photovoltaic effects were realized when a continuous C60⋅⋅⋅C60 interaction channel existed. The results indicate that the introduction of such carbazolic system into fullerene receptor would provide new insights into novel fullerene host-guest architectures for versatile applications. 相似文献