GHz repetition rate, sub-100-fs Ho:CALGO laser at 2.1 um with watt-level average power
preprint
posted on 2023-10-25, 16:00 authored by Weichao Yao, Mohsen Khalili, Yicheng Wang, Martin Hoffmann, Marcel van Delden, Thomas Musch, Clara J. SaracenoWe report on a GHz fundamental repetition rate Kerr-lens mode-locked Ho:CALGO laser emitting at 2.1 um. The laser employs a ring-cavity to increase the fundamental repetition rate to 1.179 GHz and can be made to oscillate in both directions stably with nearly identical performance: for counterclockwise oscillation, it generates 93-fs pulses at 1.68 W of average power, whereas 92 fs and 1.69 W were measured for clockwise operation. Our current results represent the highest average power from a 2-um GHz oscillator and the first sub-100-fs pulse duration from a Ho-based oscillator.
