Abstract

A novel scheme for broadband second-harmonic generation was developed with type I quasi phase matching by use of an off-digital nonlinear optical coefficient d31. This was achieved by matching of the group velocities of the second harmonic and the fundamental, while the phase velocities were quasi phase matched. The desired group-velocity dispersion could be obtained with LiNbO3 doped with 5 mol. % of MgO. Efficient second-harmonic generation with a bandwidth of 52 nm was obtained for the fundamental wavelength centered at 1566 nm in MgO-doped periodically poled LiNbO3, compared with a bandwidth of 1.3 nm for the conventional scheme using d33. Efficient frequency doubling of an ultrafast pulse is expected without group-velocity walk-off or pulse distortion.

© 2002 Optical Society of America

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