A. Arraf et Cm. Desterke, LARGE-BANDWIDTH FREQUENCY-CONVERSION IN HIGH-NA STEP-INDEX OPTICAL FIBERS, IEEE journal of quantum electronics, 34(4), 1998, pp. 660-665
Using high-NA step index optical fibers, we show, theoretically, that
large-bandwidth second-harmonic generation and sum frequency generatio
n can be achieved at conversion frequencies in the visible region of t
he spectrum.