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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