Dresden 2014 – wissenschaftliches Programm
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BE: Beschleunigerphysik
BE 2: Diagnostics and Instrumentation I
BE 2.2: Vortrag
Montag, 31. März 2014, 15:30–15:45, ZEU 255
Emulated balanced detection of fast pulses by using a single detector — •Johannes Steinmann1, Erik Bründermann2, and Anke-Susanne Müller1 — 1Karlsruhe Institute of Technology (KIT), Laboratory for Applications of Synchrotron radiation (LAS), Karlsruhe, Germany — 2Ruhr-Universität Bochum, Physikalische Chemie II, Bochum, Germany
Shot to shot signal variations in intensity and spectral properties as they occur during bursts in the THz emission of storage ring light sources like ANKA at KIT operated in low alpha mode have to be compensated for time resolved measruements. A solution can be provided by balanced detection where the incoming radiation is split into a reference beam, providing calibration, and a beam passing through the experiment. If only the intensity varied, any two detectors could be used for the detection of the reference and sample beam. Since our THz source also varies in spectral properties, two detectors with the exact same spectral response would be needed. Ultra fast THz-Detectors are in their characteristics so far not sufficiently reproducible, hard to manufacture, and very expensive. This study demonstrates that near-simultaneous recording of signal and reference pulse via time-shifted detection can emulate the advantages of balanced detection exploited by using only a single detector, thus having exactly the same detector behavior.