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本文从理论上研究了半导体非共振透明区光脉冲非线性传输的时域和频域行为,并对应用自由载流子非线性折射效应来构造非线性方向耦合器的可能性进行了分析。 相似文献
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Nonsymmetrical transition from reverse-saturable
absorption (RSA) to saturable absorption (SA) caused by excited
state absorption induced mass transport of the CuPcTs dissolved in
dimethyl sulfoxide is observed in an open aperture Z-scan experiment
with a 21-ps laser pulse. The nonsymmetrical transition from RSA to SA
is ascribed neither to saturation of excited state absorption nor to
thermal induced mass transport, the so-called Soret effect. In our
consideration, strong nonlinear absorption causes the rapid
accumulation of the non-uniform kinetic energy of the solute
molecules. The non-uniform kinetic field in turn causes the
migration of the solute molecules. Additionally, an
energy-gradient-induced mass transport theory is presented to
interpret the experimental results, and the theoretical calculations
are also taken to fit our experimental results. 相似文献
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The intensity-dependent nonlinear refraction phenomena in a non-resonant multilevel molecular system is studied using rate equations in steady state, including saturable refraction, reverse saturable refraction, and the turnover between these two effects. The relationship between the refraction saturation and the optical Kerr effect is also discussed. 相似文献
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表面等离子体是在金属和电介质交界面上所形成的电荷层,在电磁波的激励下表面等离子体会发生共振现象,影响电磁波的传播。为了拓宽表面等离子体共振技术的应用,研究了多层纳米膜结构中的表面等离子体共振,并且根据Fresnel公式和Walpita描述的矩阵方法,计算了光在含有非线性介质的多层纳米膜中传播时的反射率R,其中非线性介质具有光克尔效应和双光子吸收。应用Matlab软件,画出了反射系数R和入射角θ之间的关系曲线。进一步讨论了光学非线性对表面等离子体共振角谱的影响,其中光强在0.5×1012W/m2到1.5×1012W/m2的范围内,Rmin随着入射光强的增加而变大,而θp随入射光强的增加而呈递减的趋势。 相似文献
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Measurement of Ultrashort Laser Pulse Width in a Wide Spectrum Range Using Dimethyl Sulfoxide by Optical Kerr Effect Technique
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We illustrate that applying the optical Kerr effect technique to dimethyl sulfoxide (DMSO) can determine the width of laser pulses in a wide spectrum range that is transparent. Different from many other simple molecular liquids, such CS2, and toluene, DMSO responds to both 130 fs 800 nm laser pulses and 248 fs 400 nm laser pulses with electronic motions only. Therefore, the observed signal as a function of time reflects the temporal distribution of the intensity. We verify our illustration by both the autocorrelation technique and spectra analysis. 相似文献
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