478 research outputs found
A bright, pulsed, guide star laser for very large telescopes
No full textWe demonstrate for the first time the practical feasibility of a new sodium guide star laser with a pulsed burst output of sufficient energy at 589nm to be useful for current applications and readily scalable to meet future requirements. We describe complete experimental design verification results of the pulse burst laser concept, optimized to eliminate guide-star elongation issues and to meet all requirements for Multi Conjugate Adaptive Optics (MCAO) for future extremely large ground-based telescopes (ELTs). It makes use of sum frequency generation (SFG) of two, Q-switched, injection mode-locked, wavelength stabilized Nd:YAG lasers, producing a macro-micro, pulse-burst output which is optimized in power and bandwidth to maximize the fluorescence from the high altitude sodium layer. © 2010 SPIE.Jesper Munch, Murray Hamilton, David Hosken, Nikita Simakov and Peter Veitc
Searching for stochastic gravitational-wave background with the co-located LIGO interferometers
No full textAidan Brooks, David Hosken , Damien Mudge, Jesper Munch and Peter Veitch and are members of the LIGO Scientific CollaborationThis paper presents techniques developed by the LIGO Scientic Collaboration to search for the stochastic gravitational-wave background using the co-located pair of LIGO interferometers at Hanford, WA. We use correlations between interferometers and environment monitoring instruments, as well as time-shifts between two interferometers (described here for the first time) to identify correlated noise from non-gravitational sources. We veto particularly noisy frequency bands and assess the level of residual non-gravitational coupling that exists in the surviving data.N V Fotopoulos (for the LIGO Scientific Collaboration
Status of LIGO at the start of the fifth science run
No full textCopyright © Institute of Physics and IOP Publishing Limited 2006. Peter Veitch, David Hosken and Jesper Munch are members of the LIGO Scientific CollaborationIn November 2005, the LIGO interferometer network began data taking for its latest data run (S5). All three interferometers are working at design sensitivities with duty cycles expected to reach 80%. The Hanford 4 km detector regularly achieves aneutron star inspiral range of 12 Mpc. The S5 data run will record one year of coincident science data at unprecedented sensitivity ending in mid 2007.Samuel J Waldman (for the LIGO Science Collaboration
Adelaide High Power Laser Development
No full textDamien Mudge, David Hosken, Peter Veitch, Jesper Munchhttp://www.ligo.caltech.edu/docs/G/G040068-00/http://admdbsrv.ligo.caltech.edu/meetings/lsc_default_closed.htf?meetingid=1
10W Nd:YAG Laser for TAMA300
No full textDavid J. Hosken, Damien Mudge, Peter J. Veitch, Jesper Munch and Kohei Taken
A 10W cw Nd:YAG laser for gravitational wave interferometry
No full textDavid Hosken, Damien Mudge, Peter Veitch, Jesper Munch, and Kohei Taken
ACIGA laser technology: 10W and 100W
No full textDavid Hosken, Damien Mudge, Peter Veitch,Murray Hamilton and Jesper Munc
10W Injection-Locked CW Nd:YAG laser
No full textDavid Hosken, Damien Mudge, Peter Veitch, Jesper Munchhttp://admdbsrv.ligo.caltech.edu/meetings/lsc_default_closed.htf?meetingid=17http://www.ligo.caltech.edu/docs/G/G040069-00
Comparison of band-limited RMS of error channel and calibrated strain in LIGO S5 data
No full textAidan Brooks, David Hosken , Damien Mudge, Jesper Munch and Peter Veitch and are members of the LIGO Scientific CollaborationMany LIGO data analysis pipelines use either the DARM ERR or AS Q channels as the data source and use a response function R(f) generated from time-dependent calibration measurements to convert to strain in the frequency domain. As calibration varies on a timescale of tens of seconds, the response function must be updated frequently. An alternative is to use time-domain calibrated strain h(t). During the recent year-long LIGO science run (S5), preliminary strain data was published alongside raw interferometer output, typically within half an hour of the raw data being produced. As strain data is now available in highly-reduced form within the LIGO data archive, it represents a convenient alternative for LIGO search pipelines. This paper examines a measure of quality for calibrated strain data by calculating the band-limited RMS (BLRMS) difference between h(t) and strain he(t) as calculated directly from DARM ERR in the frequency domain.P R Charlton (for the LIGO Scientific Collaboration
Search for black hole ringdown signals in LIGO S4 data
No full textCopyright © Institute of Physics and IOP Publishing Limited 2006 Peter Veitch, Jesper Munch, Damien Mudge, Aidan Brooks and David Hosken are members of the LIGO Scientific CollaborationIf a coalescing binary system results in a black hole we expect it to be a perturbed Kerr black hole and to radiate gravitational waves in the form of ringdowns. A search for such signals in data from the fourth LIGO science run is currently being developed. In this paper we outline the theory on which this search is based and use it to predict the range for this data set.Lisa M Goggin (for the LIGO Scientific Collaboration
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