A Single-Shot-Autocorrelator with 60-dB Dynamic Range
نویسندگان
چکیده
The development of single-shot, high-dynamic-range temporal measurement devices has become necessary for characterizing high-energy petawatt laser pulses. Because of the low repetition rate of such systems, no device offers high-dynamic-range measurements in a single-shot mode. In addition, investigating the unexpected temporal behavior of pulses amplified by new techniques such as analyzed in reference [1] or the alignment complexity of a large-size petawatt-class compressor require the development of a device with a high-dynamic range and single-shot operation. We have developed a simple detection scheme that can be applied to a cross-correlator setup and improves its dynamic range by several orders of magnitude. We use an 8-bit CMOS camera that, thanks to noise reduction, yields a signal that spans over 40-dB dynamic range. With the addition of a single optical element –an optical wedge– to make a replica of the signal, we can further increase the detectable dynamic range to 60-dB without loosing the simplicity of the setup. This method is truly single shot and ideally suited for the single-shot autocorrelator setup, where the commonly admitted optical dynamic range is matched by our detection scheme.
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