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Phonon-polaritons are studied both theoretically and experimentally in a one-dimensional two-component generalized quasiperiodic piezoelectric superlattice. The experimental observation of phonon-polaritons through dielectric abnormality is carried out at the microwave region. Some potential applications are discussed. [ABSTRACT FROM AUTHOR]

Studies the frequency tunneling of optical parametric generator in superlattice LiNbO[sub3] by electro-optic effect. Wavelength change achieved; Tuning rates; Phenomenon of dispersion in electro-optic tuning.

Assesses the growth of optical superlattice LiNbO[sub 3] with different modulating periods using the Czochralski method. Application of an asymmetric temperature field system; Frequency doubling efficiency for generating light; Measurement of angle tuning tolerance of the superlattice.

The electro-optic effect of periodically poled optical superlattice LiNbO[sub 3] (PPLN) was studied. Because of the periodic electro-optic (EO) coefficient, the reciprocal vector of the periodic structure can be used to compensate for the phase mismatch between the ordinary and extraordinary waves, which is similar to the nonlinear optical frequency conversion process. If the quasi-phase-matching condition is satisfied, polarization of a light propagated in PPLN can rotate linearly with the applied electric field, which shows that PPLN may be used as a precise spectral filter or an EO switch. © 2000 American Institute of Physics. [ABSTRACT FROM AUTHOR]

An acoustic superlattice LiNbO[sub 3] crystal with periodic ferroelectric domain structure was fabricated by introducing a periodic electric current through the solid-liquid interface during the crystal growing process. The domain morphology of an as-grown crystal was observed with a scanning electron microscope, and was found to be of good periodicity. A light diffraction experiment indicated that there was a periodic fluctuation of the dielectric constant along the crystal's growing direction. Using the "crossed field" scheme, a 340 MHz ultrasonic was excited in the crystal, which means that the acoustic superlattice is suitable for constructing high-frequency bulk-wave acoustic devices. © 2000 American Institute of Physics. [ABSTRACT FROM AUTHOR]

First-order quasiphase matched blue light generation in a LiNbO3 optical superlattice was performed by direct frequency doubling of a continuous wave 978-nm diode laser. 1.27 mW output power of blue light was obtained with an incidence power of 500 mW. The frequency conversion efficiency is 0.25%. © 1996 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Optical superlattice Er:LiNbO[sub 3] was fabricated by inducing a periodic ferroelectric domain structure into the crystal during the growing process. Because of the combination of the nonlinear optical properties of LiNbO[sub 3] and the spectral properties of Er[sup 3+], the crystal can simultaneously emit the second harmonic light through quasi-phase matching and the green light through upconversion at room temperature. Pumped by infrared diode lasers, violet-and-green and blue-and-green light generation was demonstrated in two samples. The detailed absorption spectrum and emission spectrum of upconversion were measured. The possible physical mechanism was discussed. © 1998 American Institute of Physics. [ABSTRACT FROM AUTHOR]