@inproceedings{ec4e6b15c14d49f3bd4d59ae53a00cf4,
title = "Tracking faint fringes with the CHARA-Michigan Phasetracker (CHAMP)",
abstract = "The CHARA-Michigan Phasetracker (CHAMP) successfully tracks fringes in 4-telescope and 6-telescope modes when observing high-visibility targets. We have found that our primary targets (Young Stellar Objects) have unexpectedly low visibility fringes (<20%) for most baselines at CHARA, generally below our tracking thresholds. We have undertaken an upgrade cycle in 2011-2012 to re-optimize CHAMP to allow group-delay tracking on the faintest fringes possible. We describe our multi-pronged strategy using special dicroics, new piezo scanners, and our first attempts to explore CHARA J-band made possible by using special metrology-blocking laser filters. CHAMP can now be used with all the combiners at CHARA. {\textcopyright} (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.",
author = "J.~D. Monnier and F. Baron and M. Anderson and S. Kraus and R. Millan-Gabet and E. Pedretti and X. Che and {ten Brummelaar}, T. and N. Calvet",
year = "2012",
month = sep,
day = "12",
doi = "10.1117/12.926399",
language = "English",
volume = "8445",
series = "Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series",
pages = "1",
booktitle = "Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series",
}