This paper summarizes the material synthesis and properties of transparent electro-optic ceramics, namely OptoCeramic®, including PLZT and PMN-PT. Material structure, dielectric, optical and electro-optic properties are discussed. OptoCeramic materials feature in high E-O effect, low optical loss, broad transmission wavelength range, ceramic ruggedness, and low cost. A variety of devices made from OptoCeramic materials are discussed, including variable optical attenuators, polarization controllers, sinusoidal filters, dynamic gain flattening filters, tunable optical filters, and Q-switches.
Optical absorption, excitation and emission spectra of Nd3+ in PLZT ceramics have been studied. Based on the Judd-Ofelt (J-O) theory, the J-O intensity parameters are calculated to be Ω2=0.7199x10-20 cm2, Ω4=1.045x10-20 cm2, Ω6=0.9234x10-20 cm2 from the absorption spectrum of Nd3+-doped PLZT. The J-O intensity parameters have been used to calculate the radiative lifetime (0.385 ms) of the excited 4F3/2 level. The stimulated emission cross-sections and the fluorescence branch ratios for the 4F3/2 -> 4IJ transitions are also evaluated. We have also measured 1.068 mm fluorescence lifetime (0.168 ms) and calculated its Quantum efficiency (0.44). Under 807 nm excitation, the green and red upconversion luminescence from Nd3+ centers in the ceramic was observed at room temperature. Analysis reveals that Nd3+-doped PLZT is promising for the use as efficient optically amplifying or zero-loss electro-optical devices in telecommunication networks.
Reflection-mode optical phase modulators based on the structure of thin ferroelectric interferometers (TFIs) have been demonstrated. The tunable TFIs in a Gires-Tournois configuration were fabricated entirely with thin film processing techniques, resulting in solid-state and high-speed phase modulators with low driving voltage. Phase tunable spatial light modulators (SLMs) and laser beam steering devices can be constructed with variations of the basic TFI structure. Recent experimental data on the SLMs and beam steering devices are presented. Design principles, fabrication procedure and the preliminary performance of the devices are described.
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