We demonstrate electro-optic spectral tuning in a continuous-wave periodically poled LiNbO(3) (PPLN) optical parametric oscillator (OPO). We achieve 8.91 cm(-1) of rapid spectral tuning, with a linear tuning rate of 2.89 cm(-1) /(kV/mm), by applying electric fields up to +/-1.5 kV/mm across the crystal while it is operating within the OPO. Intentionally poling the PPLN crystal with an asymmetric domain structure enables tuning, and numerical predictions closely match the experimental observations. The tuning is considerably larger than the typical operational bandwidth of the OPO, indicating that we are in fact shifting the gain curve of the PPLN crystal.
Poling and orientational relaxation: Comparison of nonlinear optical mainchain and sidechain polymers Photorefractive composite materials with bifunctional charge transporting secondorder nonlinear optical chromophores Large nonbiased alloptical bistability in an electroabsorption modulator using pinip diode and asymmetric Fabry-Perot cavity structureWe present a simple experimental procedure that uses a slowly rotating étalon to measure simultaneously the electro-refraction and electro-absorption in a poled polymer. Both effects generally contribute to the measured signal from such material systems and can be distinguished by rotating the sample and observing asymmetric peaks in the signal. The experimental results show the expected increase in both electro-refraction and electro-absorption as the probe wavelength approaches the absorption band of the chromophore. Furthermore, the dispersion of the complex electro-optic coefficient displays a periodic variation that we attribute to multiple-étalon interference. The stratified nature of the thin-film structure causes the multiple-reflection interference. This artifact will pollute most of the standard electro-optic characterization techniques for poled-polymer films.
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