title: Greater than 20%-efficient frequency doubling of 1532-nm nanosecond pulses in quasi-phase-matched germanosilicate optical fibers.
abstract: We fabricated second-order nonlinear gratings in D-shaped germanosilicate fibers, using thermal poling and periodic electrodes defined by standard photolithography. These gratings, which are up to 75 mm long, were used for efficient quasi-phase-matched frequency doubling of 1.532-mum nanosecond pulses from a high-power erbium-doped fiber amplifier. Average second-harmonic powers as high as 6.8 mW and peak powers greater than 1.2 kW at 766 nm were generated, with average and peak conversion efficiencies as high as 21% and 30%, respectively.
authors: V
authors: V
authors: Pruneri
authors: G
authors: G
authors: Bonfrate
authors: P G
authors: PG
authors: Kazansky
authors: D J
authors: DJ
authors: Richardson
authors: N G
authors: NG
authors: Broderick
authors: J P
authors: JP
authors: de Sandro
authors: C
authors: C
authors: Simonneau
authors: P
authors: P
authors: Vidakovic
authors: J A
authors: JA
authors: Levenson