Abstract

Sensitive second-order optical autocorrelation measurements of CW-modelocked ultrashort pulses have been demonstrated at a number of wavelengths in the near- and mid-IR using the two-photon response of semiconductor devices^1–7 but the spectral region which had until now remained difficult to access using two-photon measurement techniques was the visible, principally because of the lack of suitable detectors in which the two-photon response dominated the residual linear response at wavelengths above the bandgap wavelength.

© 2000 Optical Society of America