The influence to the pump conversion efficiency of L-band Erbium-doped fiber amplifier(EDFA) with C-band injection seeding are fully considered and experiments demonstrate that pump conversion efficiency of L-band EDFA are improved with C-band injected signal.

The pump efficiency is about 3.

The brief introduction to the problem of power source internal resistance influencing DC-DC conversion efficiency;

An approach of improving XSLT conversion efficiency

Theoretical analysis of second-harmonic conversion efficiency in negative-index materials

The efficiency of the converter is optimized.

Among the back electrodes of Ni,Ni/Au,Au/Ni and Au film,only when the Ni film contacts the ZnTe/ZnTe:Cu complex layers,does the conversion efficiency increase with the short current increasing.

The structure of the commercial silicon solar cells which have the highest efficiency at present is analyzed and the key factor which affects the efficiency with the typical structure of the cells is found.

22 μm was obtained,the light-light transfer efficiency was up to 12%.

When connected in the single-phase network ,this power supply without any forms of filter circuit in secondary end can obtain direct current with stability , no current zero and low ripple factor,high power factor and transfer efficiency.

For reducing cost and increasing transfer efficiency, Silicon based solar is going to be films, and Si:H films has the important role in thin films solar cell materials.