Abstract
Optical frequency mixers use near-degenerate three-wave mixing in guided-wave quasi-phasematched interactions, where the waveguides were made by annealed proton exchange (APE) in periodically poled lithium niobate (PPLN). We present measurements of linear and nonlinear optical properties of buried waveguides formed by APE followed by reverse proton exchange in PPLN. The symmetry of the buried waveguides results in a four-fold improvement in conversion efficiency over that of APE guides. A spatial mode image is presented, along with a second harmonic generation tuning curve, where a peak efficiency of 150%/W-cm/sup 2/ is observed.
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