Sharif Digital Repository

Nd:YAG laser is one of the most applicable lasers on laser researches where it’s basic wavelength and higher harmonics are used on different laser projects. It should be realized that it’s basic output has a wide pulse duration and lower peak power. Therefore, in order to increase the peak power the pulse duration is reduced by Q-switching.
In this project, in the first step, based on flash-lamp pump Nd:YAG laser a 600 mj energy per 60 µs pulse is constructed. Then a pulse duration is shorten by order of more than 3000 via electro-optics Q-switching system where we could reach up to 19 ns pulses and laser peak power is increased up to several megawatts  

The amount of assigned computation to data centers, which generally process data streams in a parallel manner has grown in recent years. Switches are one of the most important components in such centers, and their appropriate design can reduce the power loss and increase the processing gain. Among such devices, holographic CDMA switches, which exploit the high storage capability of thin holograms to reduce the size of switches, are suitable alternatives to the traditional electronic switches. In this research, the fairly high power loss of such switches has significantly decreased by modifying the output filter. This modification includes two steps. In the first, the typical matched filter...