Abstract
Recent advances in high-average-power, high-repetition-rate, ultrashort laser designs has allowed these systems to approach the 5W average power level at a fraction of a terawatt peak power1. Amplified spectral bandwidths of greater than 80nm have been generated, which can support pulse durations below 17fs2, 3. In this paper, we describe such a laser system, capable of delivering the highest average power femtosecond pulses to date. Thermal lensing in the amplifier system was eliminated by cryogenically cooling the Ti:sapphire crystal. The output pulses from our system were fully characterized using the technique of transient grating and second harmonic frequency resolved optical gating. We demonstrate experimentally that the pulse duration at the output is limited only by fifth-order dispersion.
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