Er. Eliel et al., NONLINEAR OPTICS WITH A FREE-ELECTRON LASER, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 341(1-3), 1994, pp. 152-155
We report on an experiment on spectroscopic infrared-visible Sum-Frequ
ency Generation (SFG) with a Free-Electron Laser (FEL) as the IR-sourc
e. The SFG spectrum of gallium phosphide has been investigated in deta
il in an experiment covering the unsurpassed spectral range from 20 to
32 mum. This experiment demonstrates how the recent accessibility of
FELs as truly widely tunable sources of coherent radiation can impact
a well-established discipline.