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We report on a GHz fundamental repetition rate Kerr-lens mode-locked Ho:CALGOlaser emitting at 2.1 um. The laser employs a ring-cavity to increase thefundamental repetition rate to 1.179 GHz and can be made to oscillate in bothdirections stably with nearly identical performance: for counterclockwiseoscillation, it generates 93-fs pulses at 1.68 W of average power, whereas 92fs and 1.69 W were measured for clockwise operation. Our current resultsrepresent the highest average power from a 2-um GHz oscillator and the firstsub-100-fs pulse duration from a Ho-based oscillator.

GHz repetition rate, sub-100-fs Ho:CALGO laser at 2.1 um with watt-level average power