Berlin 2014 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 57: Precision measurements and metrology V (with Q)

A 57.4: Vortrag

Freitag, 21. März 2014, 17:30–17:45, DO24 1.101

Absolut distance interferometry based on a physical reference — •Günther Prellinger, Karl Meiners-Hagen, and Florian Pollinger — Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig, Germany

We present an absolute distance interferometer based on frequency-sweeping interferometry with an envisioned range of up to 100 m and a targeted measurement uncertainty well below 1E-6. We use in-situ high resolution spectroscopy to establish traceability with low uncertainty. The basic idea of frequency-sweeping multi-wavelength metrology is to vary the optical frequency over a known frequency interval for a fixed unknown distance in a classical interferometer. In our study, we investigated the use of a spectroscopic reference for the frequency measurement. Therefore, we combine the interferometric phase measurement with simultaneous Doppler-free iodine high resolution spectroscopy at 637 nm. This approach provides direct traceability of the distance measurement together with a lowered demand on environmental stability. The experimental results demonstrate that the relative uncertainty of the position (frequency) determination is approximately 3E-9. For the absolute distance measurement itself, a heterodyne interferometer with vibration compensation has been developed and simultaneous spectroscopic and interferometric measurements have been performed. The authors would like to acknowledge financial support by the Deutsche Forschungsgemeinschaft (DFG) under grant PO1560/1-1.