Abstract
Feedback in the presence of a nonlinear response can lead to optical hysteresis and bistability (OB) in numerous configurations.[l] OB and limiting have also been predicted through backward second- harmonic generation (B-SHG) via short-period or higher order quasi-phase matching (QPM) gratings, and the development of reliable technologies for QPM in ferroelectrics has recently lead to the demonstration of backward second harmonic generation (B-SHG) in Lithium Niobate.[2-3] Hereby we consider the nonlinear feedback provided by B-SHG in the presence of gain at the input fundamental frequency (FF).
© 1999 Optical Society of America
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