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A: Fachverband Atomphysik

A 1: Precision Measurements and Metrology I (with Q)

A 1.7: Vortrag

Montag, 29. Februar 2016, 12:30–12:45, a310

Femtosecond frequency comb-based heterodyne many-wavelength interferometer — •Jutta Mildner, Karl Meiners-Hagen, and Florian Pollinger — Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig

Direct traceability to the SI definition of the meter and the capability to generate synthetic wavelengths from the optical to the microwave regime make broadband optical frequency combs highly promising sources for future length metrology with high precision as required in engineering, geodesy and surveying.

In this contribution we want to present the development of a novel comb-based many-wavelength interferometer in which a direct heterodyne phase detection of individual comb lines is aimed at. To this end a single fiber-based optical frequency comb with CEO-stabilization and 250 MHz repetition rate is used as a seed laser. By cavity filtering two coherent combs of different mode spacings in the GHz band are generated and subsequently used as local oscillator and measurement beam. The deployed filtering duplet with tunable spacing and Pound-Drever-Hall stabilization scheme will be presented as well as the electronic filtering unit for phase detection. Furthermore, we want to discuss the current progress on the interferometer head setup and show preliminary results of first length measurements.

This project is performed within the joint research project SIB60 'Surveying' of the European Metrology Research Programme (EMRP). The EMRP is jointly funded by the EMRP participating countries within EURAMET and the European Union.