title: Phase and group velocity matching for second harmonic generation of femtosecond pulses.
abstract: We theoretically analyze a method for matching group velocities of fundamental and second harmonic femtosecond pulses during phase matched frequncy doubling by predispersing the fundamental pulse with a prism. The method permits improved conversion efficiency by allowing crystal lengths of several millimeters without sacrificing second harmonic pulse duration. Second harmonic pulse energy and duration are analyzed for beta-BaB(2)O(4), and limiting experimental factors are discussed. The results show that the method is most advantageous for incident pulses between 0.1- and 1.0-ps duration and microjoule and higher energies and that second harmonic pulse duration and conversion efficiency are not highly sensitive to optical misalignments of the order of 1 degrees .
authors.forename: T R
authors.initials: TR
authors.lastname: Zhang
authors.forename: H R
authors.initials: HR
authors.lastname: Choo
authors.forename: M C
authors.initials: MC
authors.lastname: Downer