Abstract
Quasi-phase matching has achieved wide recognition as a powerful and versatile tool for efficient second harmonic generation (SHG) [1,2]. In such media, for imperfect phase matching, the process of frequency up-conversion evolves periodically with distance because the residual pump wave is parametrically amplified is regions of high conversion efficiency. This results in frequency down-conversion. Even when perfect phase-matching is met, any noise power at the fundamental frequency will be strongly amplified in regions of high harmonic power, causing down conversion [3,4]. In practice, these effects limit the SHG efficiencies that can be achieved under stable conditions.
© 1995 Optical Society of America
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