680mW小型薄片式Yb:YAG/BIBO 515nm激光器

A Compact Efficient Intra-Cavity Frequency Doubled Yb:YAG/BIBO 515 nm Thin Disc Laser

报道了腔内倍频Yb:YAG/BIBO 515nm薄片激光器,Yb:YAG晶体掺杂浓度(原子数分数)为10%,几何尺寸为11mm×420μm,高反面经Cr/Au金属化处理后,采用铟焊工艺焊接到微通道水冷热沉上。理论上计算了抽运光吸收效率和注入光斑半径。耦合系统为四程抽运结构,球面镜规格为直径=26mm,曲率半径ρ=50mm,倍频晶体选用按Ⅰ类临界相位匹配角度切割的BIBO,相位匹配角度(θ,Φ)=(166.7°,90°)。在24.9 W注入抽运功率下,515nm激光最高输出功率可达680mW,光-光转换效率为2.73%。

An intra-cavity frequency doubled Yb： YAG/BIBO 515 nm thin disc laser is demonstrated. The Yb： YAG crystal with 10 % doped concentration is 420 μm in thickness and 11 mm in diameter. It is mounted onto the micro- channel copper heat sink by Cr/Au/In. The pump light absorption and pump beam radius are calculated. A four-pass optical coupling system is well designed with two spherical imaging mirrors with diameter of 26 mm and curvature radius of 50 mm. A 3 mm× 3 mm × 2 mm BIBO crystal cutting at a type-Ⅰ phase-matching direction of （θ,Ф）=（166.7°,90°） is employed. With 24.9 W incident pumping power, the maximum output power of 680 mW at 515 nm is obtained. The optical-optical conversion efficiency is 2.73 %.