We demonstrate a frequency-resolved optical gating (FROG) device that uses a sweepshot geometry that combines the advantages of multishot and single-shot pulse-measurement devices, has only one moving part, a galvanometer, and requires no computer control. Like a multishot device, it focuses the beam to a small spot (rather than a line focus) and has a high intensity in the nonlinear medium. Like single-shot devices, it makes measurements quickly, generating an entire FROG trace on a single camera screen (rather than requiring many camera downloads).
© 2001 Optical Society of America
Donald O’Shea, Mark Kimmel, Patrick O’Shea, and Rick Trebino, "Ultrashort-laser-pulse measurement using swept beams," Opt. Lett. 26, 1442-1444 (2001)