April 29 2013

02.05.13 Talk of Thomas Udem (Max-Planck-Institut für Quantenoptik , Munich, Germany) in the Kolloquium

Thomas Udem (Max-Planck-Institut für Quantenoptik, Garching, Germany) will give a talk in the physikalisches Kolloquium in C6.3 HS II at 16 ct. The titel of his talk is "Calibrating Astronomical Data with a Laser Frequency Comb".

The past years have seen the birth of precision spectroscopy in astrophysics. Today,
the best spectrographs are limited in stability by their calibration light source. A laser
frequency comb (LFC) would be an ideal calibrator for this purpose. It generates a
spectrum of lines that are equidistantly spaced in frequency with an accuracy given
by the atomic clock that controls the LFC. The main challenge is to cover a large
optical bandwidth with a line spacing that is adapted to the spectrographs resolution.
The short term repeatability demonstrated so far corresponds to a Doppler shift of
2.5cm/s. With this applications such as the detection of Earth-like planets or even
measuring the cosmic acceleration in real time come into reach.

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