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The Free‐Electron Laser (FEL) FLASH offers the worldwide still unique capability to study ultrafast processes with high‐flux, high‐repetition rate extreme ultraviolet, and soft X‐ray pulses. The vast majority of experiments at FLASH are of pump–probe type. Many of them rely on optical ultrafast lasers. Here, a novel FEL facility laser is reported which combines high average power output from Yb:YAG...
Spatially resolved measurement of free-carrier absorption in silicon nanophotonic waveguides using optical frequency-domain reflectometry is reported. Our measurement technique yields the local attenuation that is added by a strong continous-wave pump laser.
Nonreciprocal stimulated Raman scattering in a silicon waveguide is shown experimentally for the first time: the measured backward-to-forward transmission ratio is enhanced when a probe laser is tuned to the Stokes wavelength.
Raman-induced optical nonreciprocity in silicon photonic wires is demonstrated experimentally for the first time. Depending on crystallographic orientation, the ratio of counter-and co-propagating Raman efficiencies varies between 1.63 and 4.35.
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