200 GHz 1 W semiconductor disc laser emitting 800 fs pulses

Passive harmonic modelocking in a flip-chip semiconductor disc laser at a 193 GHz repetition rate with 900 mW of output power and a pulse duration of 830 fs is demonstrated. The high harmonic frequency is obtained via coupling of the laser cavity to an intracavity diamond heat spreader bonded to a semiconductor saturable absorber mirror.