Wan Razali, Wan Aizuddin (2008) Development of continuous wave and mode locked titanium sapphire laser. Masters thesis, Universiti Teknologi Malaysia, Faculty of Science.
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A Ti:sapphire laser was developed based on self mode-locking technique using a 'Z' folded cavity. Diode pumped solid state laser Verdi 5 was used as a pumping source with fundamental wavelength of 532 nm (suitable for the absorption band in Ti:sapphire crystal). Laser cavity was aligned by a set of mirrors with a high reflectivity of 99.8% to reflect the beam within the range of 720 nm to 820 nm, and an output coupler with a 5% transmission. A pair of prism was employed to control the dispersion for producing femtosecond pulse. The pulse was initiated via an external perturbation. The stability of the laser was sustained by providing a water cooling system. The laser operated in two modes which are continuous wave mode (CW) and pulse mode with mode-locked (ML) mechanism. The maximum output power of the CW Ti:sapphire laser is 1.12 W corresponding to a pumping power of 5.5 W and the efficiency of 26%. The optimum average power of mode-locked Ti:sapphire laser is 577 mW corresponding to the same pumping power of 5.5 W and a lower efficiency of 18%. The frequency of mode-locked laser pulse obtained is 96.43 MHz. The spectrum of laser radiation is centered at 806.74 nm with a bandwidth of 22.37 nm at full width half maximum (FWHM). The pulse duration of the mode-locked Ti:Sapphire laser is 30.53 femtosecond.
|Item Type:||Thesis (Masters)|
|Additional Information:||Thesis (Sarjana Sains (Fizik)) - Universiti Teknologi Malaysia, 2008; Supervisors : Assoc. Prof. Dr. Mohamad Khairi Saidin and Assoc. Prof. Dr. Noriah Bidin|
|Uncontrolled Keywords:||Ti:sapphire laser, self mode-locking technique, wave|
|Subjects:||Q Science > QC Physics|
|Deposited By:||Ms Zalinda Shuratman|
|Deposited On:||30 Jul 2010 09:39|
|Last Modified:||11 Sep 2012 09:29|
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