Physics – Optics
Scientific paper
Nov 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010cqgra..27u5002a&link_type=abstract
Classical and Quantum Gravity, Volume 27, Issue 21, pp. 215002 (2010).
Physics
Optics
Scientific paper
Thermal lensing has been one of the sensitivity-limiting factors for the LIGO detectors since their inception. Although estimates of such lensing were assumed when LIGO's core optics were specified, in practice a thermal lensing compensation system (TCS) was installed in 2004 in order to improve mode matching to the injected beam and ultimately detector sensitivity. This subsystem's primary purpose was to induce a corrective thermal lens in the input test mass mirrors or LIGO's 4 km Fabry-Perot arms. A few empirically motivated means of monitoring the focal parameters of the input couplers were employed for the 2005-2007 science run, 'S5'. We discuss results of a numerical model study, a set of signals, 'focal discriminants', that could have been used during S5 to set TCS compensation levels. Most of these signals would not have needed the installation of any new equipment or software. If investigated further, these 'focal discriminants' may find utility in pathfinder projects as the next-generation LIGO detectors are commissioned.
Amin Rupal S.
Giaime Joseph Anthony
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