Spectral broadening mechanism of Yb3+-doped cubic LuxSc2-xO3 sesquioxide crystals for ultrafast lasers
Spectral broadening mechanism of Yb3+-doped cubic LuxSc2-xO3 sesquioxide crystals for ultrafast lasers
复制标题
超快激光器用 Yb3 掺杂立方 LuxSc2-xO3 三氧化物晶体的光谱展宽机制
DOI：
10.1364/ome.451476
复制
发表时间：
2022-05-01
影响因子：
2.8
通讯作者：
Zhang, Huaijin
中科院分区：
文献类型：
--
作者：
Guo, Ruiqi;Huang, Dapeng;Zhang, Huaijin
在过去的几十年里，掺Yb 3+立方倍半氧化物晶体被认为是超快激光产生的理想增益材料，由于其高的热导率和足够的光学特性。通过混合基质晶体来获得短脉冲的光谱展宽已经被广泛探索，然而，很少有研究考察晶体场效应对光谱展宽的机制。本文描述了Yb：LuxSc 2-xO 3晶体的谱线展宽过程，谱线展宽是由晶体场效应引起的离散跃迁峰和电子-声子耦合展宽共同引起的。晶体场效应引起的能级分裂不仅决定了发射峰的位置，而且通过增加自旋轨道耦合效应使混合基质材料的发射光谱展宽。此外，在电子-声子耦合和晶场效应的参与下，室温下的光谱展宽更为明显。这些结果不仅解释了Yb 3+掺杂的倍半氧化物的光谱展宽机制，而且为改进新型超快激光材料提供了重要的启示。(C)2022 Optica出版集团根据Optica开放获取出版协议的条款
Over the past decades, Yb3+-doped cubic sesquioxide crystals have been considered as ideal gain materials for ultrafast laser generation, owing to their high thermal conductivity and adequate optical characteristics. The broadening of spectra by mixing host crystals to obtain short pulses has been extensively explored; however, few studies have examined the mechanism of the crystal field effect on spectral broadening. This paper describes the spectral broadening process caused by the combination of the discrete transition peaks induced by the crystal field effect and electron-phonon coupling widening based on Yb:LuxSc2-xO3 crystals. The energy level splitting induced by the crystal field effect not only determines the emission peak positions, but also broadens the emission spectra in the mixed host materials through the increasing spin-orbit coupling effect. Moreover, with the involvement of the electron-phonon coupling and the crystal field effect, the spectral broadening is much more obvious at room temperature. These results not only explain the spectral broadening mechanism of Yb3+-doped sesquioxides but also provide important insights for the improvement of new ultrafast laser materials. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement