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Use of a Peltier element permits adjustment of fibre temperature over the range 5–41°C, providing a tuning range of 30nm for the 3.5 μm laser. In this temperature range the laser emits nearly 1 mW at 130mW pump power.
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Allain, J.Y., Monerie, M., Poignat, H.: `Characteristics and dynamics of room temperature CW tunable green upconversion holmium fibre laser', Proc. ECOC.90, 1990, p. 575–578.
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