Compact and sensitive Er 3+/Yb 3+ co-doped YAG single crystal optical fiber thermometry based on up-conversion luminescence

摘要

Highlights?Er3+/Yb3+co-doped YAG single crystal fiber thermometry based on upconversion emissions is proposed.?High absolute sensitivity is achieved with the largest value of 0.00486K?1at 577K.?The thermal probe is directly connected to YAG single crystal fiber.?The optical coupling efficiency between the thermal probe and YAG crystal fiber is high and stable.AbstractCompact and sensitive Er3+/Yb3+co-doped YAG single crystal optical fiber thermometry based on up-conversion (UC) luminescence is presented. The thermal probe is a YAG single crystal fiber with end Er3+/Yb3+co-doped grown by laser heated pedestal growth method. Excited by a 976nm laser diode, the UC fluorescence intensity ratio (FIR) of the Er