Design and Simulation of Ti:Sapphire Pulsed Laser

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Kheyrollahi Kohanestani, Mehrdad | 2013

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 45126 (04)
University: Sharif University of Technology
Department: Physics
Advisor(s): Sadighi Bonabi, Rasoul
Abstract:
Nowadays almost all the research laboratories use femtosecond lasers, and Ti: sapphire laser is the most popular among them. Therefore, in this thesis, a Ti: sapphire pulsed laser with z-fold cavity with output of 50 fs and repetition rate of 100MHz has designed and simulated. Therefore, in the first chapter, introduction to the theory of ultrashort pulses and situation to create these pulses are presented. In addition, as regards to produce of short pulses, it is necessary to set laser in cw mode, in the second chapter we have investigated laser in cw mode. So, in this chapter, rate equations of gain medium, the stability zone of the laser, manner of removing astigmatism in the cavity, amount of pump power and effects of pump in different part such thermal distribution in the crystal, effects of thermal lensing are investigated. Moreover, in the third chapter, we have investigated laser in pulsed mode. In this chapter, nonlinear effects in the gain medium which is cause of mode-locking, all distances to create mode locking, and methods to eliminate group velocity dispersion which is a vital factor in this laser are investigated
Keywords:
Mode-Locking ; Kerr Lens Effect ; Ultrashort Pulsed Lasers ; Passive Mode-Locking ; Modulation

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