We report on the results of an experimental investigation into the newly developed Yb_0.19Y_0.34Lu_0.12Gd_0.35Ca₄O(BO₃)₃ mixed oxyborate crystal as a promising Yb-ion laser material for applications in microchip lasers. Highly efficient continuous-wave (CW) laser action was demonstrated with 0.60 mm thick crystal plates in a microchip resonator under 976-nm diode pumping. With 4.80 W of pump power absorbed, an output power of 3.15 W was produced at wavelengths around 1057 nm, resulting in an optical-to-optical efficiency of 65.5%; while in the low pumping region this efficiency could be as high as 83.4%. A comparative study confirms the superiority of this mixed oxyborate to the parent compound of Yb:YCOB in CW microchip laser performance. Stable passively Q-switched laser operation was achieved with a 2D WS₂ saturable absorber incorporated into the microchip resonator, generating a pulsed output power of 1.20 W at a repetition rate of 404 kHz; the resulting pulse energy, duration, and peak power were, respectively, 3.0 μJ, 86 ns, and 34.9 W. The results presented show the great potential of this Yb-doped mixed oxyborate crystal, in the development of CW or passively Q-switched microchip lasers operating in the 1-μm near-infrared region.

我们报告了对新开发的 Yb _0.19 Y _0.34 Lu _0.12 Gd _0.35 Ca ₄ O(BO ₃ ) ₃的实验研究结果混合硼酸晶体作为一种有前途的 Yb 离子激光材料，可用于微芯片激光器。在 976 nm 二极管泵浦下，在微芯片谐振器中使用 0.60 毫米厚的晶体板证明了高效的连续波 (CW) 激光作用。吸收了 4.80 W 的泵浦功率后，在 1057 nm 附近的波长处产生了 3.15 W 的输出功率，从而产生了 65.5% 的光对光效率；而在低泵浦区域，该效率可高达 83.4%。一项比较研究证实了这种混合硼酸在 CW 微芯片激光器性能方面优于 Yb:YCOB 母体化合物。2D WS ₂实现了稳定的被动调Q激光操作集成到微芯片谐振器中的饱和吸收器，以 404 kHz 的重复频率产生 1.20 W 的脉冲输出功率；产生的脉冲能量、持续时间和峰值功率分别为 3.0 μJ、86 ns 和 34.9 W。 结果表明，这种掺 Yb 的混合硼酸晶体在开发 CW 或被动调 Q 方面具有巨大潜力在 1-μm 近红外区域工作的微芯片激光器。