Song You-Jian

Design and manufacture of high dispersion mirror

The designed and manufactured high dispersion mirror combines the characteristics of chirped mirror and Gires-Tournois interferometer(GTI) mirror and provides high dispersion compensation with about -800fs 2 GDD in a wavelength range of 780-830 nm and about -2500fs 2 GDD in a wavelength range 1030-1050 nm, respectively. The dispersion mirror is manufactured by ion beam sputtering. The performance of the mirror has reached the designed values and can compensate the normal dispersion from ultrafst laser system effectively.

Operation of Kerr-lens mode-locked Ti：sapphire laser in the non-soliton regime

A Kerr-lens mode-locked Ti:sapphire laser operating in a non-soliton regime is demonstrated. Dispersive wave generation is observed as a result of third order dispersion in the vicinity of zero dispersion. The characteristics of the Ti:sapphire laser operating in a positive dispersion regime are presented, where the oscillator directly generates pulses with duration continuously tunable from 0.37 ps to 2.11 ps, and 36 fs pulses are achieved after extracavity compression. The oscillation is numerically simulated with an extended nonlinear Schrodinger equation, and the simulation results are in good agreement with the experimental results.