We report on an ultra-broadband tunable mid-IR source delivering 110 nJ, 64 fs-long pulses at 250 kHz repetition rate. The experiment starts with a Yb-doped fiber amplifier system delivering 200 μJ, 300 fs-long pulses, followed by a 70% high-efficiency dual-stage nonlinear compression based on a multipass cell and a 1 m-long capillary filled with argon. The 9.5 fs-long resulting pulses drive intrapulse difference-frequency generation (iDFG) in a 1 mm-thick LiGaS2 crystal and a specially designed waveplate is used prior to this crystal to further enhance the iDFG yield. This source paves the way for new experiments in 2D ultrafast spectroscopy.
We report on the CEP stabilization of a nonlinearly compressed Yb-doped fiber amplifier system delivering 75 μJ, 60 fs-long pulses at 100 kHz repetition rate. The CEP is passively stabilized via DFG in a home-made front-end and preserved in the amplification chain using a fast feedback loop. A CEP noise of only 320 mrad is measured single shot, every shot at 100 kHz. This source paves the way for a new generation of high repletion rate HHG driver.
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