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Phase-matched optical parametric amplification has been observed for the first time in a guided-wave structure. In 32-nm-long Ti-diffused LiNbO3 channel waveguides amplification of the 1.15-μ line of a cw He-Ne laser and the associated difference-frequency generation were studied. A gain of up to 75% was achieved for the TE10 (pump)–TM00 (signal, idler) mode combination with a peak pump power of ∼200 W, supplied by a tunable pulsed dye laser. An actual coherence length for the parametric interaction of 25 mm was obtained.
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Sohler et al. (1980) studied this question.
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