Extreme Doppler precision with octagonal fiber scramblers

摘要

The detection of Earth analogs with radial velocity requires long-term precision of 10 cm/s. One of the factorslimiting precision is variation in instrumental profile from observation to observation due to changes in theillumination of the slit and spectrograph optics. Fiber optics are naturally efficient scramblers. Our research isfocused on understanding the scrambling properties of fibers with different geometries. We have characterizedcircular and octagonal fibers in terms of focal ratio degradation, near-field and far-field distributions. We havecharacterized these fibers using a bench-mounted high-resolution spectrograph: the Yale Doppler DiagnosticsFacility (YDDF).© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.