The operating temperatures of the actual fibre in Tm:silica and Tm/Ho:fluorozirconate (ZBLAN) fibre laser systems pumped by diode lasers have been measured using a thermal imaging technique. A maximum operating temperature of 192 °C was measured in the Tm:silica fibre and 75 °C was determined to be the highest temperature the ZBLAN fibre could withstand before damage became likely. The outer polymer jacket was found to considerably increase the fibre temperature. Periodic oscillations were found in the output of the Tm/Ho:ZBLAN fibre at high output powers with periods between 12 and 27 ms. Both fibres were found to operate simultaneously at several wavelengths a few nanometres apart and the output wavelength was constantly fluctuating over time. The typical output wavelengths of the Tm:silica and Tm/Ho:ZBLAN fibres were 1.96 and 2.07 µm. Thermal effects were found to be minimal in Tm:silica fibres for incident pump powers of up to 36 W, whereas damage was possible in Tm/Ho:ZBLAN fibres at pump powers above 10 W.
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Coleman et al. (2003) studied this question.
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