Observation of terahertz nonlinear absorption activity in Al2O3
收藏科学数据银行2024-09-27 更新2026-04-23 收录
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资源简介：
We investigate the terahertz (THz) nonlinear absorption characteristics in a thin Al2O3 crystal using nonlinear THz spectroscopy. A THz saturable absorption performance with a high modulation depth (27.5%) and a relatively low saturable intensity (6.99 μJ/cm2) of Al2O3 is revealed, covering the THz spectrum from 0.1 to 8 THz. The inevitable presence of oxygen vacancies and impurities in Al2O3 single crystal results in the existence of free electrons within the conduction band. The transmission enhancement can be described by the change of the mobility of electrons due to intervalley scattering induced by THz pulses, based on first-principles calculations. Therefore, Al2O3 crystals have the promising application potential in the mode-locked devices for directly delivering broadband ultrashort THz pulses.
提供机构：
Liwei Song; University of Shanghai for Science and Technology; Zhuorui Zheng; Shanghai Institute of Optics and Fine Mechanics; Yifei Fang; Hongyang Li; ZhangJiang laboratory
创建时间：
2024-09-26
