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.
©2000 Optical Society of America
Full Article | PDF ArticleMore Like This
Patrick O’Shea, Mark Kimmel, Xun Gu, and Rick Trebino
Opt. Lett. 26(12) 932-934 (2001)
L. Gallmann, G. Steinmeyer, D. H. Sutter, N. Matuschek, and U. Keller
Opt. Lett. 25(4) 269-271 (2000)
Xuan Liu, Rick Trebino, and Arlee V. Smith
Opt. Express 15(8) 4585-4596 (2007)