飞秒激光Z扫描技术研究CS2的非线性特性
Investigation of nonlinear characteristics of CS2 with femto-second pulsed Z-scan technique
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摘要: 利用波长为800 nm的飞秒激光脉冲，通过Z扫描技术研究了CS2在不同光强下的非线性折射和非线性吸收特性发现，随着光强的增加，闭孔Z扫描透过率曲线发生了较大的轴向移位。分析结果表明：在低光强下，这种轴向移位源于双光子吸收的影响;而在高光强下，是双光子吸收和五阶非线性共同作用的结果。给出了决定五阶非线性存在与否的临界光强，以及非线性参量与轴向位移的关系。Abstract: Nonlinear refraction and absorption properties in carbon disulfide(CS2) have been investigated by Z-scan technique under femtosecond pulse lasers at 800 nm in a broad intensity range. It is found that the Z-scan transmittance curve has a large displacement on the axis with the increase of intensity. At low intensity, it is mainly due to two-photon absorption effect, while the fifth-order processes and two-photon absorption are at present simultaneously at high intensity. The critical intensity which determines the existence of the fifth-order nonlinear process is presented, along with the relationship between the axial displacement and some parameters of the transmittance curves.
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Key words:
- z-scan /
- carbon disulfide /
- axial displacement /
- nonlinear refraction /
- nonlinear absorption
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