Abstract
A scheme to measure temperature distribution inside a gain medium of a diode-pumped solid-state laser is proposed based on the fluorescence intensity ratio technique. By recording the temperature-dependent upconversion fluorescence related to the H11/22→I15/24 and S3/24→I15/24 transitions of Er3+, the real-time temperature distribution inside an Er3+:Yb3+:LuAl3(BO3)4 crystal end-pumped by a 976nm diode laser can be measured while a 1.55μm laser is operating. Influences of pump power, output power, and output mirror transmissivity on the temperature distribution inside the gain medium are investigated. This scheme can conveniently and accurately measure the temperature distribution along the laser path in a rare-earth-doped gain medium in real time.
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