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首页> 外文会议>Conference on Linear and Nonlinear Optics of Organic Materials III; Aug 4-6, 2003; San Diego, California, USA >Femtosecond Sagnac Interferometer for the Measurement of Third-order Nonlinear Optical Susceptibilities
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Femtosecond Sagnac Interferometer for the Measurement of Third-order Nonlinear Optical Susceptibilities

机译：飞秒Sagnac干涉仪用于测量三阶非线性光学磁化率

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摘要

A novel interferometer, a Sagnac interferometer (SI), is presented for the measurement of the difference phase and amplitude spectra induced by photoexcitation with a femtosecond time resolution. The SI has a remarkable advantage of high stability owing to the common-path configuration. In order to separate the phase and amplitude changes, the optical path difference is scanned between the probe and reference pulses making the best use of polarization. This improved polarization-division Sagnac interferometer (PSI) provides a nearly sinusoidal fringe. To demonstrate PSI we examined the nonlinear phase and amplitude changes in CS_2 and a GaAs/AlGaAs quantum well (QW) structure. The spectral feature of the nonlinear dispersion relation in QW can be explained by the blue-shift of the excitonic resonance. The time dependence of these changes is observed to be determined by the exciton lifetime. These experimental results are consistently explained from neutralization of the built-in potential inside the QW sample.
机译：提出了一种新型干涉仪，即Sagnac干涉仪（SI），用于以飞秒时间分辨率测量由光激发引起的相位差和振幅谱。由于具有公共路径配置，SI具有显着的优势，即高稳定性。为了分离相位和幅度变化，在探头和参考脉冲之间扫描光程差，从而充分利用偏振。改进的偏振分度Sagnac干涉仪（PSI）提供了接近正弦的条纹。为了证明PSI，我们检查了CS_2和GaAs / AlGaAs量子阱（QW）结构中的非线性相位和幅度变化。 QW中非线性色散关系的光谱特征可以通过激子共振的蓝移来解释。观察到这些变化的时间依赖性取决于激子寿命。这些实验结果可以通过中和QW样品中内置电位的方法得到一致解释。

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