Low-threshold sub-10 fs mode-locked Ti:sapphire laser pumped by 488 nm fiber laser

Abstract

We demonstrated the first low-threshold mode-locked Ti:sapphire oscillator pumped by a 488 nm fiber laser. Laser pulses as short as 8.2 fs with a bandwidth wider than 400 nm at a repetition rate of 148 MHz were generated under a pump power as low as 504 mW. Using a 0.5% output coupler, we further realized a 280 mW threshold power for mode-locking operation.