Broadband extreme ultraviolet dispersion measurements using a high-harmonic source

Ultrafast spin dynamics in FeNi alloys

“…Another way is to measure the photoabsorption, namely the transmittance of the EUV light through a very thin film, and to employ the Kramers Kronig relation to obtain the dispersive part of the complex refractive index [161,162]. More recent measurements are based on interferometry of which there are two versions: Either parts of the same EUV beam pass through the thin film while the rest is the reference wave [163] or two independently generated but phase-locked EUV beams interfere with a variable delay (Fourier transform spectroscopy) [164].…”