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Ho³⁺ ions doped into insulating laser crystals have exhibited 14 inter-manifold laser channels, operating in temporal modes from CW to mode-locked [1]. Ho:YAG is commonly used as an efficient means to generate 2.1-μm laser emission from the ⁵I₇ - ⁵I₈ transition, for applications such as laser remote sensing, medical surgery, and pumping Mid-IR OPO’s to achieve 3-5micron emission. Direct diode pumped systems [2], [3] and Tm: Fiber Laser pumped systems[4] have demonstrated hi slope efficiencies, some approaching the theoretical limit.
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