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Efficient, guided-wave distributed Bragg reflectors were fabricated in potassium titanyl phosphate (KTiOPO4, KTP) by ion-exchange. The period of these gratings (0.7 μm) was chosen to provide third-order Bragg reflection of the TM/sub 00/ mode at 860 nm. Gratings as short as 500 μm provided nearly 100% reflectivity. The reflection from an ion-exchanged grating was used to provide the feedback required for operation of an extended-cavity GaAlAs diode laser. Gratings as short as 70 μm provided adequate feedback for stable operation of the extended-cavity laser.
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Risk et al. (1994) studied this question.
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