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The authors have designed and fabricated a wide bandwidth high reflectivity distributed Bragg reflector (DBR) using the native oxide of AlAs as the low refractive index layer and GaAs as the high refractive index layer. Results show that the refractive index of the native oxide is 1.55±0.01, the peak reflectivity of the DBR is over 99%, and the reflectivity bandwidth is ~460 nm.
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MacDougal et al. (1994) studied this question.
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