HgCdTe detector saturation using infrared free electron laser and infrared synchrotron radiation

Recently, the high-brilliance infrared synchrotron radiation source out of various infrared sources has become popular, and it is widely used in many fields of studies. For spectroscopy, the HgCdTe (MCT) detector is often used. It covers a wide mid-infrared region and has high sensitivity, but saturates easily. In this work, the detector saturation behavior was investigated in detail using infrared synchrotron radiation and infrared free electron laser. We found that the saturation and its elimination show various patterns depending on the amplifier gain, light intensity and the time structure of the light. The influence of the saturation to the spectral shape is also discussed.