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100 W high-repetition-rate near-infrared optical parametric chirped pulse amplifier

Abstract

New high-repetition-rate x-ray free electron lasers (XFELs) require for their operation highly reliable ultrafast laser systems with high pulse energy, high repetition rate, and high average power. In this Letter, we present high-average-power scaling of near-infrared optical parametric chirped pulse amplification (OPCPA) in potassium titanyl arsenate (KTA) with tunable center wavelengths from 1.5 to 2.0 μm. Using a three-stage amplification scheme and a kW-level InnoSlab Yb:YAG pump amplifier for the final non-collinear KTA stage, we demonstrate an amplified output power of 106.2 W at a center wavelength of 1.75 μm and 100 kHz. Idler absorption introduces a potential upper limit on the average power scaling of center wavelengths <1.70μm. Future scaling of average power to hundreds of Watts is possible at center wavelengths 1.70μm.

© 2019 Optical Society of America

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