LINEAR AND NONLINEAR-OPTICAL PROPERTIES OF THE ORGANIC NONLINEAR-OPTICAL CRYSTAL 2-ADAMANTYLAMINO-5-NITROPYRIDINE

2-adamantylamino-5-nitropyridine, an organic second-order nonlinear op tical crystal viith large d coefficient, has been characterized in ter ms of its absorption and refractive indices to clarify its wavelength- conversion properties. Phase-matching curves are estimated both theore tically and experimentally. The results show that Type II angle-tuned phase-matched wavelength conversion such as second-harmonic generation and optical parametric generation are possible in the wavelength regi on from 1.2 to 1.7 mu m. In addition, 2-adamantylamino-5-nitropyridine shows higher wavelength-conversion efficiency than conventional inorg anic crystal. These results indicate that it is possible for 2-adamant ylamino-5-nitropyridine to provide Type II angle-tuned phase-matched w avelength conversion with high efficiency for optical communication sy stems. (C) 1998 Optical Society of America.