SPECTRAL PROPERTIES AND QUASI-PHASE-MATCHED 2ND-HARMONIC GENERATION IN A NEW ACTIVE MEDIUM - OPTICAL SUPERLATTICE ND-MGO-LINBO3

A new multifunctional active medium - periodically poled optical super lattice Nd:MgO:LiNbO3 crystal was grown in our Laboratory. The absorpt ion and fluorescence spectra were measured and show some differences f rom the results of common Nd:MgO:LiNbO3 with monodomain structure. Thi rd-order quasi-phase-matched violet second-harmonic generation in the sample was demonstrated to characterize the quality of the crystal. Th e properties indicate that the periodically poled optical superlattice Nd:MgO:LiNbO3 has great potential for constructing a blue or green li ght source through self-frequency-doubling operation using the maximum nonlinear optical coefficient d(33) of LiNbO3 and the high-gain pi po larization at the same time.