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Nonlinear interactions in crystal fibers

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Abstract

The considerable potential for efficient quadratic nonlinear devices in waveguides has been recognized for more than 15 yr. Intense efforts in the latter part of the last decade produced harmonic generators, frequency mixers, and parametric gain devices with high specific efficiency in planar waveguides but were hampered by their low-power handling capacity and the lack of suitable pump sources. Current interest in optical signal processing, progress in optical materials (MgO-doped LiNbO3, KTP, nonlinear organic crystals, Ag-GaSe2), and new high-power-pump sources (100-mW single-mode semiconductor lasers, stable laser-diode-pumped Nd:YAG lasers) have stimulated renewed research in guided-wave nonlinear devices. Recent advances in crystal growth technology have made it possible to consider a new type of waveguide structure, the single-crystal optical fiber (SCF), as an alternative to conventional planar-integrated optics. A number of approaches for the growth of nonlinear single crystal fibers have been reported, e.g., edge-defined growth (KDP),1 extrusion and regrowth (CuCI),1 Bridgman growth inside a glass capillary (organics).2

© 1986 Optical Society of America

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