VISIBLE DUAL-WAVELENGTH LIGHT GENERATION IN OPTICAL SUPERLATTICE ER-LINBO3 THROUGH UP-CONVERSION AND QUASI-PHASE-MATCHED FREQUENCY-DOUBLING

Optical superlattice Er:LiNbO3 was fabricated by inducing a periodic f erroelectric domain structure into the crystal during the growing proc ess. Because of the combination of the nonlinear optical properties of LiNbO3 and the spectral properties of Er3+, the crystal can simultane ously emit the second harmonic light through quasi-phase matching and the green light through upconversion at room temperature. Pumped by in frared diode lasers, violet-and-green and blue-and-green light generat ion was demonstrated in two samples. The detailed absorption spectrum and emission spectrum of upconversion were measured. The possible phys ical mechanism was discussed. (C) 1998 American Institute of Physics.