Abstract

We demonstrate a carrier-envelope phase (CEP)-stable, KTA (KTiOAsO4)-based optical parametric amplifier (OPA) delivering 6-cycle (79 fs), 3.8-μm pulses at a 100-kHz repetition rate with an average power of 4.5 W. The pivotal achievement is the stable generation of supercontinuum (SC) seed pulses in YAG with 1.4-ps pulses, which are the longest for SC generation on its longer wavelength side to 2.2 μm. This technology offers a robust and simplified OPA architecture with characteristics of passively stabilized CEPs, simplified dispersion management with bulk materials, wavelength tunability for 1.3–4.5 μm for spectroscopy, and a proof of concept on its power scaling with kilowatt-class pump lasers. The total output power of 17 W (signal plus idler) is achieved, and this high photon flux opens novel statistics-driven spectroscopy for rare events in strong-field physics.

© 2019 Optical Society of America

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Corrections

21 August 2019: A typographical correction was made to the title.


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