Abstract

The demand for miniature blue and violet laser applications has stimulated the research on nonlinear optical crystals for semiconductor laser (800-1000nm) second-harmonic generation (SHG).This paper summarized our recent development on the exploration of new organic nonlinear optical (NLO) materials for such purposes. Based on the features of organic crystals and the requirements of semiconductor lasers to the corresponding SHG materials. The relations between the crystal sturcture and the spectral characteristics as well as the NLO properties of the organic corjugated molecules were investigated. The electron spectra of the donors and acceptors and their influence on the NLO properties were analyzed. According to these results. We have made an approach for solving the contradiction existed between the UV transmission range and the nonlinear conversion efficiency of the crystals i. e. Substituting the medium and weak donor-acceptor radicals into benzene- the organic conjugated matrix, to form benjene derivatives. Which may possess both large NLO coefficients and good UV transmission property, and satisfy the requirement for diode laser SHG applications.

© 1992 Optical Society of America