Application to Temperature Sensor Based on Green Up-conversion of Er³⁺ Doped Silicate Glass

The green up-conversion emissions centered at the wavelengths of about 534nmand 549nm of the Er³⁺ doped silicate glass were recorded, using a 978 nm semiconductorlaser diode (LD) as an excitation source. The fluorescence intensity ratio (FIR) of the greenup-conversion emissions at about 534nm and 549nm in the Er³⁺ doped silicate glass wasstudied as a function of temperature over the temperature range of 296K-673K. Themaximum sensitivity and the temperature resolution derived from the FIR of the green up-conversion emissions are approximately 0.0023K^-1 and 0.8K, respectively. It isdemonstrated that the prototype optical temperature sensor based on the FIR technique fromthe green up-conversion emissions in the Er³⁺ doped silicate glass could play a major role intemperature measurement.