We present a new theoretical scheme for an Ho3+-doped athermal high-power continuous-wave amplifier. This approach, with two optical pump sources, allows amplification without detrimental heating. Athermal amplification is achieved by the balance between heating generated during the amplification process, which involves 5I8 and 5I7 levels, and laser cooling with anti-Stokes fluorescence, which involves the 5I8 and 5I6 levels. For athermal operation, the pump power providing the cooling has to be distributed properly along the length of the amplifier.
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Nemova et al. (2011) studied this question.
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