10 W scale 1048nm femtosecond laser and applications for synchronously pumped Ti:sapphire laser and OPO
演讲课题：10 W scale 1048nm femtosecond laser and applications for synchronously pumped Ti:sapphire laser and OPO
I will report our recent progresses on solid-state and fiber femtosecond lasers in this presentation. Based on previous research work, a passively mode-locked Yb:KGW oscillator is demonstrated with a semiconductor saturable absorber mirror (SESAM), pump by a 976 nm fiber-coupled diode laser. The maximum output power is 7.6 W with the pump power of 28.4 W, and the corresponding conversion efficiency is 26.8%. With chirped mirrors to control the dispersion compensation, the laser pulses as short as 160 fs at 1048 nm are obtained with a repetition rate of 78 MHz, the output power has a fluctuation of less than 1% RMS over 2 hours. In addition to, 60W average power was obtained from a fiber CPA laser with pulse duration of 153 fs and repetition rate of 1MHz. By using the frequency doubled femtosecond Yb:KGW laser as the pump source, we demonstrated a self-starting femtosecond Ti:sapphire laser, average power up to 256 mW with duration of 12.7 fs is obtained at a repetition rate of 151 MHz. In particular, synchronously pumped optical parametrical oscillator were realized with KTA, LBO and BiBO as nonlinear crystals, tunable wavelengths from 688 to 1057 nm with power up to 1.9 W, from 1.41 to 1.71 μm with power up to 2.32 W, from 2.61 to 3.84 μm with power up to 1.3W were demonstrated, the shortest laser pulse was 86 fs. Using these laser wavelengths as source for two photo microscope, STED and OCT, biology images with high resolution were obtained.