The analysis of a noncollinear acousto-optic tunable filter commonly found in the literature is based on an approximation for the birefringence of the interaction material. It is demonstrated that this approximation leads to a significant error in calculating the optimum incident angle for a device, which can seriously degrade its performance if a fixed output beam angle is required. An alternative, exact analysis is presented and compared with experimental results.
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J. R. Sambles (1991) studied this question.
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