Fibre gratings for high temperature sensor applications

Phosphosilicate fibre gratings can be stabilized at temperatures in excess of 500 degreesC for sensor applications by optimizing thermal and UV presen sitization recipes. Furthermore, the use of 193 min presensitization preven ts the formation of OH absorption bands, extending the use of fibre grating s across the entire wavelength spectrum. Gratings for operation at 700 degr eesC retaining up to 70% reflectivity after 30 min are demonstrated.