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 . 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 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 , compared with a bandwidth of 1.3 nm for the conventional scheme using . 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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