Beam quality of ultrashort titanium sapphire laser

Abstract

This paper reports the measurement of beam quality of titanium sapphire femtosecond laser. The fundamental wavelength of the femtosecond laser is 809 nm with the bandwidth of 18.82 nm and pulse duration of approximately 30 fs. It operates with a frequency of 75 MHz and 250 mW of the average power. A lens with focal length of 100 mm was used to focus the beam. A CCD camera was utilized as a sensitive sensor to capture the direct beam along its path of propagation, which was interfaced to a personnel computer. M2 factor was utilized to estimate the quality of the beam. The beam was found to operate in transverse mode of TEM00 with the M2 value of 2.76