Abstract
Abstract Glass optical waveguides (OWGs) doped with alkali ions were examined mainly in terms of optical sensitivity of monitoring surface chemical species located at surfaces. The maximum sensitivity (per 1 cm optical path length) for K+-doped glass OWGs was ca. 50 times as large as that of conventional optical measurements with normal incidence of monitoring light. Rb+-doped and Cs+-doped OWGs had higher sensitivities, but they showed rather large attenuation of the guided light.
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