Abstract

We present a new theoretical scheme for an ${\mathrm{Ho}}^{3+}$-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 ${}^5{I}_8$ and ${}^5{I}_7$ levels, and laser cooling with anti-Stokes fluorescence, which involves the ${}^5{I}_8$ and ${}^5{I}_6$ levels. For athermal operation, the pump power providing the cooling has to be distributed properly along the length of the amplifier.

© 2011 Optical Society of America

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