Thermal diffusion bonding of Yb:YAG and sapphire crystals was successfully implemented for the first time, and composite active elements having a geometry of a thin disk with an undoped cap were fabricated. The composites were tested in a continuous-wave thin-disk laser scheme at up to 400 W output average power, confirming that bonding strength is sufficient to operate at high thermal load. The radiation phase and polarization distortions as well as the small signal gain were studied. It is shown that depolarization is a significant problem in the considered composites; however, a proper choice of the parameters allows minimizing this impact.

中文翻译：

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通过热扩散粘合生产的复合Yb：YAG /蓝宝石薄盘有源元件

首次成功地实现了Yb：YAG与蓝宝石晶体的热扩散键合，并制造了具有无盖帽的薄盘几何形状的复合有源元件。在连续波薄盘激光方案中，以高达400 W的平均输出功率对复合材料进行了测试，证实了粘合强度足以在高热负荷下运行。研究了辐射相位和偏振畸变以及小信号增益。结果表明，在考虑的复合材料中，去极化是一个重大问题。但是，正确选择参数可以最大程度地减少这种影响。