Abstract

A thermooptical temperature sensor suitable for low temperatures is proposed. Eu³⁺-doped fluoride glass can be used as a thermooptical transducer, since its optical absorption intensity for the ⁷F₁—⁷F₆ transition, which occurs at 2.2 μm, is modulated by temperature. Temperature resolving power is confirmed to be 0.5 K in the 77–150 K range using a Eu³⁺-doped fluoride fiber. The applicable temperature range and resolving power are varied with the doping content of the Eu³⁺ ion.

© 1986 Optical Society of America

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