Universiti Teknologi Malaysia Institutional Repository

Development of continuous wave and mode locked titanium sapphire laser

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:sapphire laser, 'z' folded cavity
Subjects:Q Science > QC Physics
ID Code:10075
Deposited By: Narimah Nawil
Deposited On:30 Jul 2010 09:39
Last Modified:14 Oct 2018 07:21

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