Omid Panahi - Laser-Plasma Research Institute, Shahid Beheshti University, Tehran, Iran
Majid Nazeri - Department of Photonics, Faculty of Physics, University of Kashan, Kashan, Iran
Seyed Hassan Tavassoli - Laser-Plasma Research Institute, Shahid Beheshti University, Tehran, Iran

In this paper, design and construction of atunable pulsed Ti:sapphire laser and numerical solution ofthe corresponding rate equations are reported. Rate equationsfor a four-level system are written and their numericalsolution is examined. Furthermore, an optical setup is introduced.In this setup, a Ti:sapphire crystal is longitudinallypumped by the second harmonics of a Q-SwitchedNd:YAG laser, and a prism is used as a wavelengthselectiveelement as well. This setup is established for two10 and 50 % transmission output couplers. In case of usingthe 10 % coupler, the output energy of the laser, for thepump energy of 36 mJ, is pulses with 3.5 mJ energy andfor the 50 % coupler, with 50 mJ of pump energy, pulseswith 10 mJ energy are generated. A wavelength tuningrange of more than 160 nm is possible. The repetition rateof this laser is 10 Hz and the temporal duration of thepulses is about 30 ns.

Nano second Tunable Rate equations Prism Pulsed Ti:sapphire laser Nd:YAG