High-power integrated ultrafast We performed time-resolved degenerate pump-probe measurements 4semiconductor disk laser: multi-Watt 10 GHz pulse generation

Presented is an optically pumped modelocked integrated external-cavity surface emitting laser (MIXSEL) with a pulse repetition rate of 10 GHz, generating picosecond pulses at 2.4 W average output power at a centre wavelength of 963 nm. The MIXSEL structure in-tegrates both the absorber and the gain layers within the same wafer. The saturable absorber is a single layer of self-assembled InAs quantum dots (QD) and the gain is obtained with seven InGaAs quantum wells. It is shown that the picosecond pulse duration is limited by the slow recovery time of the integrated QD saturable absorber. Introduction: Compact high-power ultrafast lasers with pulse repetition rates of several gigahertz are of great interest for many applications, such as optical clocking, optical interconnects or optical sampling. VECSELs (vertical external cavity surface emitting lasers), modelocked with SESAMs (semiconductor saturable absorber mirrors), achieve excellen