Yb,Tm:LiYF4 lasers at 1.5 and 2.3 µm pumped by a Yb-fiber laser.

Applied optics Pub Date : 2025-09-10 DOI:10.1364/AO.573953
Ahmed Nady, Pavel Loiko, Abdelmjid Benayad, Alain Braud, Ammar Hideur, Patrice Camy
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Abstract

We demonstrate the viability of pumping Yb3+,Tm3+ codoped crystals by commercial 976 nm Yb-fiber lasers for achieving low-threshold, efficient and power-scalable operation at 1.5 and 2.3 µm. A Yb,Tm:LiYF4 laser employing this pumping scheme generated a continuous-wave output power up to 0.70 W at ∼2307nm (the 3H43H5 transition) with a slope efficiency of 26.7%, laser threshold down to 46 mW, and linear polarization (π). It also delivered 0.60 W at 1497 nm (the 3H43F4 transition) with a slope efficiency of 26.1% and a laser threshold of 78 mW. Polarization switching at 1.5 µm between π and σ states was observed and explained by gain anisotropy. Various approaches for pumping 2.3 µm Tm lasers are discussed and compared.

Yb光纤激光器抽运1.5和2.3 μ m波长的Yb,Tm:LiYF4激光器。
我们证明了通过商用976 nm yb光纤激光器泵送Yb3+,Tm3+共掺杂晶体的可行性,以实现1.5和2.3 μ m的低阈值,高效和功率可扩展的操作。采用该泵浦方案的A Yb,Tm:LiYF4激光器在~ 2307nm处(3H4→3H5跃迁)产生的连续波输出功率高达0.70 W,斜率效率为26.7%,激光阈值降至46 mW,线性偏振(π)。它还在1497 nm (3H4→3F4转变)处输出0.60 W,斜率效率为26.1%,激光阈值为78 mW。在1.5µm处观察到π态和σ态之间的偏振切换,并用增益各向异性来解释。讨论并比较了2.3 μ m Tm激光器的各种泵浦方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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