Third-order guided-wave distributed Bragg reflectors fabricated by ion-exchange in KTiOPO/sub 4/

Abstract

Efficient, guided-wave distributed Bragg reflectors were fabricated in potassium titanyl phosphate (KTiOPO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> , 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.