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Fritsch, Kilian; Pötzlberger, Markus; Pervak, Vladimir; Brons, Jonathan; Pronin, Oleg (2018): All-solid-state multipass spectral broadening to sub-20 fs. In: Optics Letters, Vol. 43, No. 19: pp. 4643-4646
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In this work, we present a nonlinear spectral broadening and compression scheme based on self-phase modulation in bulk media inside a Herriott-type multipass cell. With this reliable approach, we achieved a spectral broadening factor of 22 while maintaining an efficiency of over 60% at an average input power of 100 W, and an excellent output beam quality with M-2 = 1.2. The output pulses were compressed to 18 fs, with the broadest spectrum supporting a Fourier-transform limit of 10 fs. The high efficiency and approximately four-optical-cycle pulse duration mark an important milestone towards the realization of a compact, high power oscillator-based driver for XUV frequency combs and other nonlinear processes.