Group delay dispersion measurements in the mid-infrared spectral range of 2-20 μmстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 28 октября 2016 г.
Аннотация:We present two measurement devices which both allow the direct measurement of the group delay (GD) and group delay dispersion (GDD) of laser optics, covering the near- and mid-infrared (MIR) spectral range from 2 to 20 & x00B5;m (500-5,000 cm& x2212;1). Two different kinds of devices were developed to measure the GDD of multilayer interference coatings. One is a resonant scanning interferometer (RSI) and the other is a white light interferometer (WLI). The WLI is also capable of measuring the GDD in transmission, for instance of bulk material. GDD measurements of a high dispersive mirror for wavelengths from 2.0 to 2.15 & x00B5;m and one of a multilayer mirror from 8.5 to 12.0 & x00B5;m are presented. A measurement of a zinc selenide (ZnSe) substrate in transmission was made with the WLI demonstrating the full bandwidth of the device from 1.9 to 20 & x00B5;m. The comparison of all measurements with their related theoretical values shows a remarkable correspondence.