Sub-10 fs laser pulses with repetition rate of 1.1 GHz by a Ti: sapphire oscillator

We demonstrate a compact Ti: sapphire oscillator with ring cavity configuration. By optimizing the in-tra-cavity dispersion with chirped mirrors, pulses with repetition rate of 1.1 GHz are coupled out by the uncoated wedges in the cavity. Under 7W CW pump laser centered at 532 nm, the average power of the output pulses is about 30 mW, the duration is less than 10fs and the spectrum spans from 670 nm to 920 nm.