The study on BWGd:Nd glass for new laser amplifier: Properties, theoretical and practical investigations
The study on BWGd:Nd glass for new laser amplifier: Properties, theoretical and practical investigations
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新型激光放大器用BWGd:Nd玻璃的研究：性能、理论和实践研究
DOI：
10.1016/j.optmat.2022.112535
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发表时间：
2022
影响因子：
3.9
通讯作者：
Kaewkhao J.
中科院分区：
文献类型：
--
作者：
Kaewnuam E.;Wantana N.;Tu Nguyen Xuan;Minh Pham Hong;Yamanoi K.;Kaewkhao J.
本文研究了一种新型的激光放大玻璃--掺Nd3+的钨镓硼酸盐玻璃(BWGd：ND)。采用熔体猝灭技术制备了不同Nd2O_3浓度的玻璃。测量的密度、折射率和其他计算的物理参数导致了假设，随着Nd2O_3含量的增加，NdO-O的共价度和NbO的数目增加。这两个因素的增强可能会增加配位场的强度，使Nd3+的一些能级略有移动和分裂。从4F5/2态分裂出的能级是通过单声子弛豫将Nd3+布居加速到4F3/2发光水平的中间能级。这种电子-声子耦合和低声子能量是4F3/2→4I11/2跃迁(1074 Nm)强Nd3+发光和高辐射参数的关键，特别是高量子效率(约96%)。由于Δλ效应高，σ发光，但τ值不长，适合用于激光放大器。在实际的激光放大实验中，所研制的玻璃在3.55 W泵浦功率下的增益放大倍数约为1.5倍。BWGd：ND玻璃性能优良，可作为激光聚变及其他应用激光系统的激光放大材料。
The new laser-amplifier glass, Nd3+doped tungsten gadolinium borate glass (BWGd:Nd), was investigated in this work. Glasses with different Nd2O3concentration were prepared by melt-quenching technique. The measured density, refractive index and other calculated physical parameters leaded to the assumption that the degree of Nd–O covalency and the number of NBO increased with addition of Nd2O3content. The enhancement of both factors possibly increased the strength of ligand field that slightly shifted and split some energy levels of Nd3+. The energy level splitting from4F5/2state was an intermediate level which accelerated the Nd3+population on the4F3/2luminescence level by single-phonon relaxation. This electron-phonon coupling and low phonon energy of BWGd host glass was a key for strong Nd3+luminescence of4F3/2→4I11/2transition (1074 nm) and high radiative parameters, especially the high quantum efficiency around 96%. Due to high value of Δλeffas well asσembut no longτexpvalue, this glass is suitable for laser amplifier. In practical laser-amplifier experiment, the gain amplification of developed glass was around 1.5 times under pumping power of 3.55 W. The BWGd:Nd glass performed high ability and may using as laser-amplifier material in the laser fusion and other applied laser system.