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Proceedings Paper

Transferring the Rb+ hyperfine-structure stability to a Fabry-Perot resonator used as a frequency standard for astronomical spectrographs
Author(s): Philipp Huke; Hanno Holzhüter; Ansgar Reiners
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Paper Abstract

We report on the experimental realization of locking a Fabry-Perot interferometer (FPI) onto a stabilized diode laser for the calibration of astronomical spectrographs. The external cavity diode laser (ECDL) is stabilized to the 85Rb+ F* = 2 → F = 3 transition with a pump-probe setup. The stability of the 85Rb+ reached between optical clocks is on the order of 10-13.1 and can be used to reduce the linewidth / drift of the ECDL to a few kHz.2 The measured linewidth of the transition is around 20 MHz due to unavoidable misalignment between pump- and probe-beam, power- and Doppler-broadening at room temperature.2 The aim is to transfer this stability to a FPI that can be used as optical frequency standard: Therefore the phase of the light reflected from the FPI is observed using the Pound-Drever-Hall method. The theoretically reachable stability of a few mHz/Hz3 is limited by different noise factors. In order to identify these noise factors we a) follow the calculation of noise factors given by, 4 b) calculate the contribution of misalignment and insufficient mode matching by applying the generalized matrix-formalism, 5 and c) estimate the contribution of the initial laser linewidth and the present electronic noise sources.

Paper Details

Date Published: 21 June 2015
PDF: 7 pages
Proc. SPIE 9526, Modeling Aspects in Optical Metrology V, 95260I (21 June 2015); doi: 10.1117/12.2184971
Show Author Affiliations
Philipp Huke, Institute for Astrophysics, Univ. Göttingen (Germany)
Hanno Holzhüter, Institute for Astrophysics, Univ. Göttingen (Germany)
Ansgar Reiners, Institute for Astrophysics, Univ. Göttingen (Germany)

Published in SPIE Proceedings Vol. 9526:
Modeling Aspects in Optical Metrology V
Bernd Bodermann; Karsten Frenner; Richard M. Silver, Editor(s)

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