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Acousto-Optic Tunable Filters for Imaging Applications in the 2-4~μm with Low RF Drive Power

100%
Valle S., Ward J., Pannell C., Johnson N.
Acta Physica Polonica A
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2015
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vol. 127
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issue 1
58-59
EN
The λ^{2} dependence on acoustic field intensity (and hence RF drive power) can render large aperture acousto-optic tunable filters impractical for many applications beyond about 2 μm. One potential technique for reducing the RF drive-power requirement is to configure an acousto-optic tunable filter such that the interaction region is at acoustic resonance. We describe an acousto-optic tunable filter that operates at resonance and present an analysis of the predicted performance. In addition, we address the practical issues in deploying such a scheme. Finally, we present results of a prototype "resonant acousto-optic tunable filter" operating in the 1-2 μm region.
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Defects and Defect Reactions in Semiconductor Nitrides

88%
Van de Walle C., Neugebauer J., Stampfl C., McCluskey M., Johnson N.
Acta Physica Polonica A
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1999
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vol. 96
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issue 5
613-627
EN
We report a comprehensive investigation of native point defects and impurities in GaN, AlN, and AlGaN alloys, with the goal of understanding doping limitations in nitride semiconductors. Unintentional incorporation of impurities (mainly oxygen) explains the tendency of nitride semiconductors to exhibit n-type conductivity. Silicon is the n-type dopant of choice; it remains shallow in AlGaN up to high Al content, while oxygen undergoes a DX transition. Experimental evidence for DX centers will be discussed. In p-type material, Mg doping is hindered by an increase in ionization energy with increasing Al content in AlGaN, and by nitrogen vacancies acting as compensating centers. Complex formation between magnesium and oxygen and between magnesium and nitrogen vacancies will be discussed.
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