Cryogenic Yb$^{3+}$-Doped Solid-State Lasers
Cryogenic Yb$^{3+}$-Doped Solid-State Lasers
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DOI：
10.1109/jstqe.2007.896602
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发表时间：
2007-06
影响因子：
4.9
通讯作者：
Tso Yee Fan;D. Ripin;R. L. Aggarwal;J. Ochoa;B. Chann;Michael Tilleman;Joshua Spitzberg
中科院分区：
文献类型：
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作者：
Tso Yee Fan;D. Ripin;R. L. Aggarwal;J. Ochoa;B. Chann;Michael Tilleman;Joshua Spitzberg
低温冷却固体激光器有望在功率可伸缩性方面带来一场革命，同时由于效率和热光特性的显著改善而保持良好的光束质量。对于Yb激光器尤其如此，因为它们的量子缺陷相对较低，即使在低温下也具有相对较宽的吸收。综述了基质材料的热光性质，包括导热系数、热膨胀系数和低温折射率，并给出了关于陶瓷和单晶、GGG、GdVO4和Y2O3的数据。研究了Yb：YAG和Yb：LiYF4(YLF)的光谱性质，包括吸收截面、发射截面和低温下的荧光寿命。最近的实验已经将端面泵浦的低温致冷Yb：YAG激光器的功率从640W的入射泵浦功率提高到455W的连续输出功率，输出功率为M2 1.4。
Cryogenically cooled solid-state lasers promise a revolution in power scalability while maintaining a good beam quality because of significant improvements in efficiency and thermo-optic properties. This is particularly true for Yb lasers because of their relatively low quantum defect and relatively broadband absorption even at cryogenic temperatures. Thermo-optic properties of host materials, including thermal conductivity, thermal expansion, and refractive index at low temperature, are reviewed and data presented for YAG (ceramic and single crystal), GGG, GdVO4, and Y2O3. Spectroscopic properties of Yb:YAG and Yb:LiYF4 (YLF) including absorption cross sections, emission cross sections, and fluorescence lifetimes at cryogenic temperatures are characterized. Recent experiments have pushed the power from an end-pumped cryogenically cooled Yb:YAG laser to 455-W continuous-wave output power from 640-W incident pump power at an of M2 1.4.