title: Efficient doubling of femtosecond pulses in aperiodically and periodically poled KTP crystals.
abstract: Efficient doubling of femtosecond pulses in periodically and aperiodically poled KTP crystals is demonstrated by employing the quasiphasematched frequency conversion technique. Conversion efficiencies as high as 60% were achieved using either aperiodically or periodically poled KTP nonlinear crystals in an extracavity, single-pass configuration using a diode-pumped femtosecond Yb:KYW laser as the pump source. The temporal characteristics of the frequency-doubled pulses as a function of focusing conditions in a "thick" nonlinear crystal regime have been investigated experimentally and pulses as short as 177 fs have been generated at around 520 nm under strong focusing conditions using a KTP crystal with aperiodic poling.
authors.forename: A A
authors.initials: AA
authors.lastname: Lagatsky
authors.forename: C T A
authors.initials: CT
authors.lastname: Brown
authors.forename: W
authors.initials: W
authors.lastname: Sibbett
authors.forename: S J
authors.initials: SJ
authors.lastname: Holmgren
authors.forename: C
authors.initials: C
authors.lastname: Canalias
authors.forename: V
authors.initials: V
authors.lastname: Pasiskevicius
authors.forename: F
authors.initials: F
authors.lastname: Laurell
authors.forename: E U
authors.initials: EU
authors.lastname: Rafailov