Kavli Affiliate: Scott K. Cushing
| First 5 Authors: Alexei A. Maznev, Wonseok Lee, Scott K. Cushing, Dario De Angelis, Danny Fainozzi
| Summary:
Self-diffraction is a non-collinear four-wave mixing technique well-known in
optics. We explore self-diffraction in the extreme ultraviolet (EUV) range,
taking advantage of intense femtosecond EUV pulses produced by a free electron
laser. Two pulses are crossed in a thin cobalt film and their interference
results in a spatially periodic electronic excitation. The diffraction of one
of the same pulses by the associated refractive index modulation is measured as
a function of the EUV wavelength. A sharp peak in the self-diffraction
efficiency is observed at the M$_{2,3}$ absorption edge of cobalt at 59 eV and
a fine structure is found above the edge. The results are compared with a
theoretical model assuming that the excitation results in an increase of the
electronic temperature. EUV self-diffraction offers a potentially useful
spectroscopy tool and will be instrumental in studying coherent effects in the
EUV range.
| Search Query: ArXiv Query: search_query=au:”Scott K. Cushing”&id_list=&start=0&max_results=3