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We demonstrate a cryogenically cooled Ti:sapphire ultrafast regenerative amplifier laser system producing &gt;20 μJ energies at 50 kHz, &gt;12 μJ at 200 kHz and &gt;3.5 μJ at 1MHz with repetition rates continuously tunable from 50 kHz up to 1.7 MHz in a footprint of only 60x180 cm². This laser uses down-chirped pulse amplification employing a grism stretcher and a glass-block compressor, achieving sub-60-fs pulse duration. This laser represents a several-times improvement in repetition-rate and average power over past Ti:sapphire-based ultrafast lasers in this class. We discuss the unique challenges and solutions for this laser system. This laser system has wide applications especially in ultrafast photoemission, nonlinear imaging and spectroscopy, as well as for micro/nano-machining and ultrafast laser therapy and surgery.

Multi-microjoule, MHz repetition rate Ti:sapphire ultrafast regenerative amplifier system