We show that a frequency-resolved optical gating device using (1) a thick n
onlinear crystal to replace the usual thin crystal and spectrometer and (2)
a Fresnel biprism to replace the beam splitter and delay line yields a rem
arkably simple single-shot ultrashort-pulse intensity-and-phase measurement
device with no sensitive alignment parameters and significantly greater se
nsitivity. (C) 2001 Optical Society of America