为了降低主振荡放大激光器(Master oscillator power amplifier, MOPA)光纤激光器驱动系统的热耗散、 提高其电光效率和单脉冲输出能量,提出了一种风冷恒温运行技术和智能程控电源方法。基于驱动电源的总体设计目标,从制冷方式、 制冷器件的选择等方面进行了研究,实现了对整个激光器系统温度的精确控制,系统运行温度误差为±0.5 ℃。研究了放大抽运源激光输出能量、 输入电压随输入电流的关系,实现了抽运源恒流驱动电流大于 10 A,脉冲驱动电流大于20 A的设计要求。实验结果对MOPA 光纤激光器的优化设计具有重要的参考作用。

通过对比FeS2颗粒两种形貌的催化活性及在染料敏化太阳能电池(DSSCs)上的表现,选择出性能更高的FeS2颗粒。 通过水热法和热注入法合成了立方体和球状高纯度FeS2,将FeS2制备成对电极(CEs)并组装在DSSCs上。 通过测试电池的光电转化效率及对电极的催化活性,发现球状FeS2颗粒有更高的催化活性, 基于球状FeS2 CEs的电池也获得了更高的光电转化效率。在100 mW/cm2 (AM 1.5) 强度的模拟光源下, 基于立方体和球状高纯度FeS2 CEs的DSSCs分别获得了高达4.55%和5.69%的光电转化效率。

Liquid metals-such as lead (Pb) or lead-bismuth (PbBi) are used as reactor core coolants for accelerator driven systems (ADS) proposed for high-level radioactive waste transmutation. Compatibility of steels with liquid PbBi is a key problem because steels are attacked by dissolution of the components in PbBi, so it has to form a stable coating on steel surface. There are many methods to prepare anti-corrosion coatings on steel, such as hot dipping, pack cementation, plasma spaying, and physical vapor deposition (PVD). Compared with other methods, the PVD method is easy to control the thickness of the coating and the obtained coatings are dense which is crucial to the anti-corrosion ability of the coatings. In this letter, PVD aluminum coatings are developed on the surface of T91 steel and different heat-treatment atmosphere is used to adjust the microstructure, aluminum content, and the phase of the coatings. It is found that the coatings have good adherence ability with steel. The aluminum content and the phase of the coating can be adjusted by the heat-treatment atmosphere. Corrosion tests are performed in oxygen-saturated liquid PbBi at 550 oC for 1 000 h, the phase and composition of the coating do not change drastically. All the results indicate that the PVD is a useful method to prepare coatings on the surface of steel used in liquid PbBi.

A sol-gel method for the preparation of silica coating that varied in refractive index is developed. Silicon dioxide sol is obtained by hydrolysis and co-condensation reactions occurred in acid-catalyzed system. Surface morphology, refractive index, and transmission spectrum of the samples are studied. The results of transmission spectra of single-sided coatings show that the average transmittance of the samples increases about 4% compared with the uncoated one in the spectra range from 400 to 1 200 nm in the case of vertical incidence. For the double-sided coating the maximum transmittance is 99% at the wavelength of 840 nm.