In this paper, we describe a Nd:YLF laser based on high speed RTP electro optical cavity dump ing technique. Two home made 150 W fiber pump modules are used from both sides to pump Nd:YLF crystal. Coupling systems are the key elements in end pumped solid state lasers, the aberrations of which greatly affect the efficiency of the lasers. In order to get high efficient and good quality laser output, the optical soft ware ZEMAX is used to design a four piece coupling system. When the pumped energy is 32 mJ at the repe tition rate of 1 Hz, the output energy is 6.5 mJ with 2.5 ns pulse width. When the pumped energy is 13.1 W at the repetition rate of 200 Hz, the output energy is 2.2 W with small M 2 factor where is 1.04, and is 1.05, and the light light conversion efficiency is up to 16.8%.
The performance of dye-sensitized solar cells (DSSCs) is strongly affected by the properties of semiconductor nanoparticles. In this work, we used TiO 2 particles prepared by TiCl 4 hydrolysis n times on Al 2 O 3 films (A/T(n)), and investigated morphology, photoelectric, and electron transport properties of A/T(n). The TiO 2 shell was composed of 10-20 nm nanoparticles and the number of nanoparticles increased with increasing TiCl 4 treatment times. The highest photoelectric conversion efficiency of 3.23% was obtained as A/T(4). IMPS results indicated that electron transport rate was high enough to conduct current, and was not the dominating effect to limit the J sc . J sc was mainly determined by dye loading on TiO 2 and the interconnection of TiO 2 . These may provide a new strategy for preparing semiconductor working electrodes for DSSC.
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