We report a diode-end-pumped Nd:YVO 4 laser with a first-radial-order Laguerre–Gaussian (LG 10 ) mode output by using a pump beam shaping scheme. A simple method for conditioning the diode pump beam using a core-ring-shaped pump fibre allows selective excitation of the LG 10 mode in the Nd:YVO 4 laser resonator, yielding 0.35 W of continuous-wave output in a core-ring-shaped LG 10 mode beam with a beam propagation factor (M 2 ) of <3.2. The corresponding slope efficiency with respect to the incident pump power was 21%. We also investigated the beam propagating characteristics of the LG 10 mode beam showing that the core beam of the LG 10 mode has a smaller focused beam size accompanied by lower divergence, compared with the TEM 00 mode beam. The prospects for further power scaling and generation of a higher order LG p0 mode are discussed.

中文翻译：

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在Nd：YVO 4激光器中集成了环形芯泵浦光纤，直接生成一阶拉格-高斯模

我们报告了一个二极管端泵浦Nd：YVO 4激光器，该激光器通过使用泵浦光束整形方案输出一阶径向Laguerre-Gaussian（LG 10）模式。使用芯环形泵浦光纤调节二极管泵浦光束的简单方法允许在Nd：YVO 4激光谐振器中选择性激发LG 10模式，从而在芯环形激光器中产生0.35 W连续波输出光束传播因子（M 2）<3.2的LG 10模式光束。相对于入射泵功率的斜率效率为21％。我们还研究了LG 10模式光束的光束传播特性，表明与TEM 00模式光束相比，LG 10模式的核心光束具有较小的聚焦光束尺寸，并具有较低的发散度。讨论了进一步功率缩放和生成更高阶LG p0模式的前景。