Abstract

We exploit the high second-order susceptibility of the organic crystal N-(4–nitrophenyl)-L-prolinol to accomplish, through a cascaded second-order process, wavelength conversion of a signal pulse (from 1.16 to 1.14 µm) under the action of a pump pulse (at 1.15 µm). In a 2.8-mm-thick crystal, wavelength conversion with unit gain was obtained with a pump peak intensity as low as 9 MW/cm2. At low intensities, in the limit of negligible conversion where the cascading effect can be described through an effective third-order susceptibility, we derive χeff32.4×10-17 m2/V2, which is 102 larger than the nonresonant χ3 of conjugated polymers or semiconductors.

© 1998 Optical Society of America

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