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High-performance acousto-optic materials: Hg2Cl2 and PbBr2
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1992
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Attenuation CoefficientOptical MaterialsAcoustic AttenuationEngineeringCrystal Growth TechnologyAcoustic MetamaterialOptical GlassOptical PropertiesMaterials SciencePhotonicsCrystalline DefectsCrystal MaterialOptoelectronic MaterialsCrystallographyCrystal Structure DesignElectro-optics DeviceHigh-performance Acousto-optic MaterialsApplied PhysicsCondensed Matter PhysicsCrystalsPrior Crystals
New results achieved with recently grown Hg<sub>2</sub>Cl<sub>2</sub> and PbBr<sub>2</sub> crystals are described. With an optimized crystal growth technique Hg<sub>2</sub>Cl<sub>2</sub> crystals were grown that show a significantly reduced acoustic attenuation compared to prior crystals, from 13.4 to 8 dB/μs-GHz<sup>2</sup>. These crystals allow the development of Hg<sub>2</sub>Cl<sub>2</sub> Bragg cells with time-bandwidth product figures in the 5100 to 6900 range, frequency operation as high as that for Te02, and resolution about 25% higher than TeO<sub>2</sub> for similar crystal lengths. PbBr<sub>2</sub> crystals were also grown that exhibit a large figure of merit (<i>M</i><sub>2</sub> 550) with an attenuation coefficient of 12 dB/μs-GHz<sup>2</sup>. This material may be the choice for infrared devices where large diffraction efficiencies are needed.