title: Efficient frequency doubling of a femtosecond fiber laser.
abstract: We report optimization of a stretched-pulse erbium-doped fiber laser for second-harmonic generation and the evaluation of several nonlinear crystals for this application. With compressed fundamental pulse energies of 2.7 nJ at 31.8 MHz, we achieved 10% conversion efficiency and 86-fs, 771-nm pulses with energies of 270 pJ. Frequency-resolved optical gating was used to analyze both the fundamental and the frequencydoubled pulses.
authors.forename: L E
authors.initials: LE
authors.lastname: Nelson
authors.forename: S B
authors.initials: SB
authors.lastname: Fleischer
authors.forename: G
authors.initials: G
authors.lastname: Lenz
authors.forename: E P
authors.initials: EP
authors.lastname: Ippen