Extreme Doppler precision with octagonal fiber scramblers

J. F. P. Spronck; Z. A. Kaplan; D. A. Fischer; C. Schwab; A. E. Szymkowiak

doi:10.1117/12.926340

24 September 2012 Extreme Doppler precision with octagonal fiber scramblers

J. F. P. Spronck, Z. A. Kaplan, D. A. Fischer, C. Schwab, A. E. Szymkowiak

Proceedings Volume 8446, Ground-based and Airborne Instrumentation for Astronomy IV; 84468T (2012) https://doi.org/10.1117/12.926340
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

The detection of Earth analogs with radial velocity requires long-term precision of 10 cm/s. One of the factors limiting precision is variation in instrumental profile from observation to observation due to changes in the illumination of the slit and spectrograph optics. Fiber optics are naturally efficient scramblers. Our research is focused on understanding the scrambling properties of fibers with different geometries. We have characterized circular and octagonal fibers in terms of focal ratio degradation, near-field and far-field distributions. We have characterized these fibers using a bench-mounted high-resolution spectrograph: the Yale Doppler Diagnostics Facility (YDDF).

Citation Download Citation

J. F. P. Spronck, Z. A. Kaplan, D. A. Fischer, C. Schwab, and A. E. Szymkowiak "Extreme Doppler precision with octagonal fiber scramblers", Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 84468T (24 September 2012); https://doi.org/10.1117/12.926340

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