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 1.532μm 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.

© 1999 Optical Society of America

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