We develop a fluoride-based intra-cavity pumped Ho laser for the first time, where the severe thermal lensing of the intra-cavity pumping mechanism can be compensated by the negative thermal-optical property of the ${\rm{YLi}}{{\rm{F}}_4}$ (YLF) host. A maximum output power of 11.3 W ($\pi$-pol) at 2062 nm, corresponding to a conversion efficiency of 28.2% from the incident diode laser to the Ho laser, was obtained with a power instability below 0.5% and a near diffraction limited beam quality with ${M^2}$ of 1.06 and 1.25 in the horizontal and vertical directions, respectively. These are the maximum power and the best beam quality for the reported compact intra-cavity pumped Ho lasers, to the best of our knowledge.

中文翻译：

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基于11 W YLF的腔内抽运Ho激光器，具有近衍射限制的光束质量

我们首次开发了基于氟化物的腔内泵浦Ho激光器，其中腔内泵浦机制的严重热透镜可以通过$ {\ rm {YLi}} {的负热光学特性来补偿{\ rm {F}} _ 4} $（YLF）主机。在2062 nm处的最大输出功率为11.3 W（$ pi- pol），对应于从入射二极管激光器到Ho激光器的转换效率为28.2％，其功率不稳定性低于0.5％，并且接近衍射限制了光束质量，水平和垂直方向上的$ {M ^ 2} $分别为1.06和1.25。据我们所知，这是已报道的紧凑型腔内泵浦Ho激光器的最大功率和最佳光束质量。