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Measurements of femtosecond pulse temporal profile by means of a Michelson interferometer with a Schottky junction

机译：通过带有肖特基结的迈克尔逊干涉仪测量飞秒脉冲的时间分布

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摘要

We introduce a new method for femtosecond pulse shape measurement. The interference of two pulses is employed rather than the second-harmonic generation (SHG). Usually, the measurements of the femtosecond pulse is realized by an interferometer in combination with a nonlinear optical material, while the measurement that we describe is realized by means of a Michelson interferometer with a Schottky junction. Only a metal-semiconductor junction (Schottky junction) is needed, and neither the nonlinear optical material nor a photodetector is included. The two-photon absorption arises when the light is strong enough, while there is only a one-photon absorption when the light is weak. And the calculations are in good agreement with the experimental results. In principle, the new technique could be used for the measuring of pulses with any duration and with very low power. Unlike the SHG scheme, in the new method the quality of optics, mechanics, and other elements of the scheme are not essential, and the measurement is easily realized, but the results are quite precise and very sensitive to the light.
机译：我们介绍了一种飞秒脉冲形状测量的新方法。使用两个脉冲的干扰，而不是二次谐波（SHG）。通常，飞秒脉冲的测量是通过干涉仪结合非线性光学材料来实现的，而我们描述的测量是通过带有肖特基结的迈克尔逊干涉仪来实现的。仅需要金属-半导体结（肖特基结），并且既不包括非线性光学材料也不包括光电检测器。当光足够强时会产生双光子吸收，而当光弱时则只有一个光子吸收。计算结果与实验结果吻合良好。原则上，新技术可用于测量任何持续时间和非常低的功率的脉冲。与SHG方案不同，在新方法中，方案的光学，力学和其他元素的质量不是必需的，并且易于实现测量，但是结果非常精确并且对光非常敏感。

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