Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences
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Fabrication and characterization of TGG crystals containing paramagnetic rare-earth ions
No full textNational Natural Science Foundation of China [51472257]Highly transparent Tb3-xRexGa5O12 (RE=Ce, Pr and Nd) single crystals were grown by the Czochralski (Cz) method. The optical and magneto-optical properties of Tb3-xRexGa5O12 were analyzed in detailed. Tb3-xRexGa5O12 exhibited very high transmittance in the visible-near infrared region (VIS-NIR). The absorption coefficient and Faraday rotation spectrum were investigated at VIS-NIR region at room temperature. The remarkable higher Verdet constants (V) and figure of merit showed superior characteristics of Tb3-xRexGa5O12 compared to that of Tb3Ga5O12 (TGG). We also investigated the thermal conductivity and laser induced damage threshold (LIDT) of the crystals. The superior performance of the materials indicate that Tb3-xRexGa5O12 have great potential to meet the increasing demand for magneto optical devices in the VIS-NIR region. (C) 2016 Elsevier Ltd. All rights reserved
Functionalization of reduced graphene oxide with axially-coordinated metal-porphyrins: facile syntheses and temporally-dependent nonlinear optical properties
No full textNational Natural Science Foundation of China [51432006, 50925207, 51172100]; Ministry of Science and Technology of China for the International Science Linkages Program [2011DFG52970]; Ministry of Education of China for the Changjiang Innovation Research TReduced graphene oxide-tin porphyrin (RGO-SnTPP) nanohybrids with good dispersibility have been prepared by two covalent functionalization approaches. The microscopic structure and morphology of the RGO-SnTPP nanohybrids were characterized by various spectroscopic techniques including Fourier transform infrared spectroscopy, Raman spectroscopy, transmission electron microscopy, thermogravimetric analysis and X-ray photoelectron spectroscopy. Ground-state absorption and steady-state fluorescence studies indicate considerable pi-pi interactions and effective photo-induced electron and/or energy transfer from the porphyrin moieties to the RGO. Their nonlinear optical properties were investigated using the Z-scan technique at 532 nm with both picosecond and nanosecond laser pulses. The RGO-SnTPP hybrids were found to exhibit large nonlinear optical responses due to a combination of mechanisms, while significant differences in their nonlinear optical responses were observed, highlighting the influence on photophysical properties of the degree of functionalization and the synthetic approach employed
Femtosecond laser pulse induced phase transition of Cr-doped Sb2Te1 films studied with a pump-probe system
No full textThe Femtosecond laser pulse induced phase transition dynamics of Cr-doped Sb2Te1 films was studied by real-time reflectivity measurements with a pump-probe system. It was found that crystallization of the as-deposited CrxSb2Te1 phase-change thin films exhibits a multi-stage process lasting for about 40ns. The time required for the multi-stage process seems to be not related to the contents of Cr element. The durations of the crystallization and amorphization processes are approximately the same. Doping Cr into Sb2Te1 thin film can improve its photo-thermal stability without obvious change in the crystallization rate. Optical images and image intensity cross sections are used to visualize the transformed regions. This work may provide further insight into the phase-change mechanism of CrxSb2Te1 under extra-non-equilibrium conditions and aid to develop new ultrafast phase-change memory materials
同时实现高速率激光通信和高精度激光测距的方法
No full text为了能够使飞行器在相同的载荷下完成多重任务,提高系统的性能,本文提出了一种能同时实现高速率激光通信和高精度激光测距的方法。本文采用具有唯一性、良好自相关和良好互相关性质的伪随机码作为测距码,采用双向单程的通信方式,将两地的通信数据和测距码打包成帧串行传输并相互发射,能够实现高速率的通信;将
Femtosecond laser pulse induced phase transition of Cr-doped Sb2Te1 films studied with a pump-probe system
No full textThe Femtosecond laser pulse induced phase transition dynamics of Cr-doped Sb2Te1 films was studied by real-time reflectivity measurements with a pump-probe system. It was found that crystallization of the as-deposited CrxSb2Te1 phase-change thin films exhibits a multi-stage process lasting for about 40ns. The time required for the multi-stage process seems to be not related to the contents of Cr element. The durations of the crystallization and amorphization processes are approximately the same. Doping Cr into Sb2Te1 thin film can improve its photo-thermal stability without obvious change in the crystallization rate. Optical images and image intensity cross sections are used to visualize the transformed regions. This work may provide further insight into the phase-change mechanism of CrxSb2Te1 under extra-non-equilibrium conditions and aid to develop new ultrafast phase-change memory materials
光刻机偏振照明系统偏振态测量实验结果
No full text偏振照明系统是浸液光刻机增强分辨率的标准配置,针对浸液光刻机偏振照明系统在安装集成时偏振参数检测的需求,本课题组设计制造了一套偏振照明系统偏振态检测装置,为偏振照明系统安装集成时的故障诊断、性能评估等提供依据。该偏振检测装置实验的配置如图1所示,在传统光刻照明系统中增加偏振分束棱镜PBS产生X方
Efficient Vortex Laser With Annular Pumping Formed by Circle Dammann Grating
No full textNational Natural Science Foundation of China [61275206, 61475166]We proposed and demonstrated an efficient vortex Nd:YVO4 laser under the utilization of a circle Dammann grating (CDG). As a simple binary-phase component, CDG was inserted into the pump unit of this laser-diode end-pumped solid-state laser and reshaped the pump radiation into annular profile with high efficiency. Moreover, such utilization of CDG avoided additional modification to laser cavity. As a result, the laser emitted vortex beam with a high slope efficiency of 51% and a maximum beam power of 554 mW at 1.75-W incident pump power
Pixelated source optimization for optical lithography via particle swarm optimization
No full textNational Natural Science Foundation of China [61275207, 61205102, 61474129, 61405210]Source optimization is one of the key techniques for achieving higher resolution without increasing the complexity of mask design. An efficient source optimization approach is proposed on the basis of particle swarm optimization. The pixelated sources are encoded into particles, which are evaluated by using the pattern error as the fitness function. Afterward, the optimization is implemented by updating the velocities and positions of these particles. This approach is demonstrated using three mask patterns, including a periodic array of contact holes, a vertical line/space design, and a complicated pattern. The pattern errors are reduced by 69.6%, 51.5%, and 40.3%, respectively. Compared with the source optimization approach via genetic algorithm, the proposed approach leads to faster convergence while improving the image quality at the same time. Compared with the source optimization approach via gradient descent method, the proposed approach does not need the calculation of gradients, and it has a strong adaptation to various lithographic models, fitness functions, and resist models. The robustness of the proposed approach to initial sources is also verified. (C) 2016 Society of Photo-Optical Instrumentation Engineers (SPIE