ABSTRACT We report on the polarized spectroscopic properties and efficient laser emission of Yb0.19Y0.34Lu0.12Gd0.35Ca4O(BO3)3, a newly developed (Yb, Y, Lu, Gd) mixed oxyborate crystal. The strongest absorption is found to occur at 976.6 nm for E//Y, with a cross-section measured to be 2.05 × 10−20 cm2; the main emission band important to laser action appears to be strongest for E//Z, its maximum cross-section at 1028.8 nm amounts to 0.34 × 10−20 cm2. Efficient laser emission was realized with a Y-cut crystal in a plano-concave resonator, under excitation of either broad-band 937-nm or narrow-band 973-nm pumping radiation. An output power of 7.36 W was produced under 937-nm pumping, with a slope efficiency of 55%; while under 973-nm pumping, the output power achievable could be scaled to 16.80 W, with optical conversion and slope efficiencies being, respectively, 57.6% and 70%.

中文翻译：

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混合（Yb、Y、Lu、Gd）硼酸钙晶体的光谱和激光特性：Yb0.19Y0.34Lu0.12Gd0.35Ca4O(BO3)3

摘要 我们报告了 Yb0.19Y0.34Lu0.12Gd0.35Ca4O(BO3)3，一种新开发的 (Yb, Y, Lu, Gd) 混合硼酸盐晶体的偏振光谱特性和有效的激光发射。发现最强的吸收发生在 E//Y 的 976.6 nm 处，测得的横截面为 2.05 × 10−20 cm2；对激光作用重要的主要发射带似乎对 E//Z 最强，其 1028.8 nm 处的最大横截面为 0.34 × 10−20 cm2。在宽带 937 nm 或窄带 973 nm 泵浦辐射的激发下，使用平凹谐振器中的 Y 切割晶体实现了高效的激光发射。在 937 nm 泵浦下产生 7.36 W 的输出功率，斜率效率为 55%；而在 973-nm 泵浦下，可实现的输出功率可扩展至 16.80 W，