材料科学
超快激光光谱学
激发
飞秒
光学
吸收(声学)
激光器
超短脉冲
激发态
光电子学
光谱学
吸收光谱法
瞬态(计算机编程)
皮秒
光子上转换
作者
Vincenzo De Michele,Alice Sciortino,Fabrizio Messina,Marco Cannas,Aziz Boukenter,Emmanuel Marin,Sylvain Girard,Youcef Ouerdane
出处
期刊:Optics Letters
[The Optical Society]
日期:2021-04-01
卷期号:46 (7): 1736-1739
摘要
We report a set of femtosecond (fs) transient absorption (TA) measurements following the dynamics of the so-called nonbridging oxygen hole center in silica, a model color center in wide bandgap amorphous solids, characterized by a very large Stokes shift between the UV excitation and its associated red emission at 1.9 eV. The changes in the TA spectrum were probed in the UV-visible range at various delays after photoexcitation and analyzed as a function of the UV excitation energy, in single-photon absorption conditions. The combination of the experiments helps to clarify the defect photocycle, highlighting how TA measurements with tunable UV excitation could represent a powerful tool to investigate the dynamics of color centers embedded in transparent materials.
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