W. Plass et al., SURFACE SUM-FREQUENCY MIXING FOR AUTOCORRELATION AND CROSS-CORRELATION OF ULTRASHORT UV AND IR PULSES, Applied physics. B, Photophysics and laser chemistry, 54(3), 1992, pp. 199-201
Surface sum-frequency mixing is shown to be a valuable tool in determi
ning the width and shape of ultrashort ultraviolet and infrared laser
pulses. The method is demonstrated to measure LV pulses of 300 fs and
IR pulses of about 2.9 ps duration. In cross-correlation set-ups the m
ethod is inherently background-free, but background-free arrangements
can also be realized for autocorrelation measurements, useful especial
ly in the ultraviolet. In the present experiments on GaAs(111) and Pd(
111) a spectral range from 3.3-mu-m to below 200 nm is covered, which
certainly can be extended to longer as well as to shorter wavelengths.
Due to the small source volume phase-matching is not required.