Physics – Optics
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ess.....2.4104s&link_type=abstract
American Astronomical Society, ESS meeting #2, #41.04
Physics
Optics
Scientific paper
The detection of Earth-like exoplanets with the radial velocity method requires extreme Doppler precision and long-term stability in order to measure tiny reflex velocities in the host star. Recent planet searches have led to the detection of so called “super-Earths” (up to a few Earth masses) that induce radial velocity changes of about 1 m/s. However, the detection of true Earth analogs requires a precision of 10 cm/s. One of the factors limiting Doppler precision is variation in the Point Spread Function (PSF) from observation to observation due to changes in the illumination of the slit and spectrograph optics. Thus, this stability has become a focus of current instrumentation work. Fiber optics have been used since the 1980’s to couple telescopes to high-precision spectrographs, initially for simpler mechanical design and control. However, fiber optics are also naturally efficient scramblers. Scrambling refers to a fiber’s ability to produce an output beam independent of input. Our research is focused on understanding the scrambling properties of fibers with different geometries (circular, square, octagonal), different lengths and fiber sizes. Another important parameter when it comes to fibers is the so-called focal ratio degradation (FRD), which accounts for a different (faster) focal ratio after the fiber than the one sent into the fiber. In this paper, we will present new insight on fiber scrambling, FRD and what we call fiber personality, which describes differing behaviors for supposedly identical fiber.
Fischer Debra
Kaplan Zachary
Spronck Julien
No associations
LandOfFree
Fiber Scrambling for Extreme Doppler Precision does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Fiber Scrambling for Extreme Doppler Precision, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fiber Scrambling for Extreme Doppler Precision will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-833364