We report on the efficient continuous-wave diode-pumped laser operation of Ho in the monoclinic KLu(WO 4 ) 2 crystal at ∼2080 nm, resonantly pumped at a wavelength of ∼1941 nm by a fiber-coupled GaSb diode stack. A maximum output power of 408 mW and a slope efficiency of 54.5% with respect to the absorbed pump power were achieved. A comparison of the laser performance within the Ho-doped KRE(WO 4 ) 2 (Ho:KRE(WO 4 ) 2 ) family of monoclinic crystals showed a slightly superior performance of Ho:KY(WO 4 ) 2 , achieving a maximum output power of 438 mW and a slope efficiency of 58.8% under identical conditions.
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Jambunathan et al. (2011) studied this question.
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