title: Increased-bandwidth in ultrashort-pulse measurement using an angle-dithered nonlinear-optical crystal.
abstract: We show that the usual phase-matching-bandwidth constraint in ultrashort-laser-pulse measurement techniques is overly restrictive. Specifically, the phase-matching bandwidth need not exceed the pulse bandwidth on every pulse. Instead, only the phase-matching bandwidth integrated over the measurement period need exceed the pulse bandwidth. We show that angle-dithering a second-harmonic-generation crystal that is otherwise too narrowband (that is, too thick) can yield sufficient phase-matching bandwidth and an accurate pulse measurement. We apply this technique to frequency-resolved optical gating (FROG) and show that accurate pulse measurements can be made using a comparatively very thick and hence narrowband crystal. An additional advantage of using a thick crystal is increased signal strength.
authors.forename: P
authors.initials: P
authors.lastname: O'Shea
authors.forename: M
authors.initials: M
authors.lastname: Kimmel
authors.forename: X
authors.initials: X
authors.lastname: Gu
authors.forename: R
authors.initials: R
authors.lastname: Trebino