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Alexandrite: an attractive thin-disk laser material alternative to Yb:YAG?
Journal of the Optical Society of America B ( IF 1.8 ) Pub Date : 2020-01-28 , DOI: 10.1364/josab.380140
Umit Demirbas , Franz X. Kärtner

Yb:YAG thin-disk (TD) technology has enabled construction of laser/amplifier systems with unprecedented average/peak power levels, and has become the workhorse of many scientific investigations. On the other hand, for some applications, the narrow emission bandwidth of Yb:YAG limits its potential, and the search for alternative broadband TD gain media with suitable thermo-optomechanical parameters is ongoing. The alexandrite gain medium has a broad emission spectrum centered around 750 nm, possesses thermomechanical strength that even outperforms Yb:YAG, and has unique spectroscopic properties enabling efficient laser operation even at elevated temperatures. In this work, we have numerically investigated the power scaling potential of continuous-wave (cw) alexandrite lasers in TD geometry for the first time. Using a detailed laser model, we have compared the potential cw laser performance of Yb:YAG, Ti:Sapphire, Cr:LiSAF, Cr:LiCAF, and alexandrite thin-disk lasers under similar conditions and show that among the investigated transition metal-doped gain media, alexandrite is the best alternative to Yb:YAG in power scaling studies at room temperature. Our analysis further demonstrates that potentially Ti:Sapphire is also a good alternative TD material, but only at cryogenic temperatures. However, in comparison with Yb:YAG, the achievable laser gain is relatively low for both alexandrite and Ti:Sapphire, which then requires usage of low-loss cavities with small output coupling for efficient cw operation.

中文翻译:

Alexandrite:Yb:YAG的一种有吸引力的薄盘激光材料替代品?

Yb:YAG薄盘(TD)技术使激光/放大器系统的构建具有前所未有的平均/峰值功率水平,并且已成为许多科学研究的主力军。另一方面,对于某些应用,Yb:YAG的窄发射带宽限制了它的潜力,并且正在寻找具有合适的热光机械参数的替代宽带TD增益介质。翠绿宝石增益介质具有约750 nm的宽发射光谱,具有甚至优于Yb:YAG的热机械强度,并具有独特的光谱特性,即使在高温下也能有效地进行激光操作。在这项工作中,我们首次在TD几何形状上数值研究了连续波(cw)变石激光器的功率定标潜力。使用详细的激光模型,我们比较了在类似条件下Yb:YAG,Ti:蓝宝石,Cr:LiSAF,Cr:LiCAF和紫翠菊薄盘激光器的潜在连续激光性能,并表明在研究的过渡金属掺杂增益介质中,紫翠兰是在室温下进行功率缩放研究时,是Yb:YAG的最佳替代品。我们的分析进一步表明,只有在低温下,潜在的Ti:Sapphire也是TD的良好替代材料。但是,与Yb:YAG相比,变石和Ti:Sapphire均可达到的激光增益都相对较低,因此需要使用低损耗腔且输出耦合较小,以实现有效的连续工作。以及在相似条件下的翠绿宝石薄盘激光器,结果表明,在研究的过渡金属掺杂增益介质中,翠绿宝石是室温下功率定标研究中Yb:YAG的最佳替代品。我们的分析进一步表明,只有在低温下,潜在的Ti:Sapphire也是TD的良好替代材料。但是,与Yb:YAG相比,变石和Ti:Sapphire均可达到的激光增益都相对较低,因此需要使用低损耗腔且输出耦合较小,以实现有效的连续工作。以及在相似条件下的翠绿宝石薄盘激光器,结果表明,在研究的过渡金属掺杂增益介质中,翠绿宝石是室温下功率定标研究中Yb:YAG的最佳替代品。我们的分析进一步表明,只有在低温下,潜在的Ti:Sapphire也是TD的良好替代材料。但是,与Yb:YAG相比,变石和Ti:Sapphire均可达到的激光增益都相对较低,因此需要使用低损耗腔且输出耦合较小,以实现有效的连续工作。
更新日期:2020-02-03
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