Fig. 1 OPA setup. OPA setup. The Kerr-lens mode-locked Yb:YAG thin-disc oscillator delivers 1.3-μJ pulses of 230-fs duration with a 37.5-MHz repetition.

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Presentation transcript:

Fig. 1 OPA setup. OPA setup. The Kerr-lens mode-locked Yb:YAG thin-disc oscillator delivers 1.3-μJ pulses of 230-fs duration with a 37.5-MHz repetition rate. A dielectric mirror (OC) transmits either 3% or 15% of the oscillator power. The reflected light can be attenuated by a half-wave plate (λ/2) and thin-film polarizer (TFP) sequence and is directly used to pump the nonlinear crystal (Xtal), which is either PPLN or LGS. The seed generation is accomplished in a fiber with either a 2.7-μm (for PPLN) or 10.3-μm (for LGS) mode-field diameter. To suppress cross-phase modulation, the polarization is cleaned in front of the fiber. Aspheric lenses were used for coupling and collimation. The long wavelengths of the continuum and the pump are overlapped in space with a dichroic mirror (DM) and in time with a translation stage in the pump arm (τ). The polarizations of seed and pump are optimized for maximal conversion to the MIR. After the nonlinear crystal, the beams are collimated. The MIR is separated by means of a beam splitter (BS). The optics in the box with the dashed blue outline were only set up for supercontinuum generation (SCG) after the PPLN OPA. All lenses in the box and the Si plate for dispersion compensation were made from silicon and anti-reflection–coated from 3 to 5 μm. The lenses were plano-convex. The first has a focal length of 75 mm, and the second and third have focal lengths of 25 mm. The supercontinuum was roughly collimated with a parabolic mirror of 2-inch focal length. The ZGP crystals are described in detail in the main text. For dispersion compensation after the first ZGP crystal, a 2-mm sapphire (Sa) and a 5-mm CaF2 plate were inserted at Brewster’s angle. Marcus Seidel et al. Sci Adv 2018;4:eaaq1526 Copyright © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).