Titania-doped tantala/silica coatings for gravitational-wave detection (2007)
Harry, Gregory M., Abernathy, Matthew R., Becerra-Toledo, Andres E., Armandula, Helena, Black, Eric, Dooley, Kate, ...
Reducing thermal noise from optical coatings is crucial to reaching the required sensitivity in next generation interferometric gravitational-wave detectors. Here we show that adding TiO2 to Ta2O5 in...
Levinson, Amir, Lee, Hyun Kyu, Regimbau, Tania, Punturo, Michele, Harry, Gregory M.
Gamma-ray bursts are believed to originate in core-collapse of massive stars. This produces an active nucleus containing a rapidly rotating Kerr black hole surrounded by a uniformly magnetized torus...
Titania-doped tantala/silica coatings for gravitational-wave detection (2006)
Harry, Gregory M., Abernathy, Matthew R., Becerra-Toledo, Andres E., Armandula, Helena, Black, Eric, Dooley, Kate, ...
Reducing thermal noise from optical coatings is crucial to reaching the required sensitivity in next generation interferometric gravitational-waves detectors. Here we show that adding TiO$_2$ to...
Laser interferometry for the Big Bang Observer (2006)
Harry, Gregory M., Fritschel, Peter, Shaddock, Daniel A., Folkner, William, Phinney, E. Sterl
The Big Bang Observer is a proposed space-based gravitational-wave detector intended as a follow on mission to the Laser Interferometer Space Antenna (LISA). It is designed to detect the stochastic...
Thermal noise from optical coatings in gravitational wave detectors (2006)
Harry, Gregory M., Armandula, Helena, Black, Eric, Crooks, D. R. M., Cagnoli, Gianpietro, Hough, Jim, ...
Gravitational waves are a prediction of Einstein's general theory of relativity. These waves are created by massive objects, like neutron stars or black holes, oscillating at speeds appreciable to...
Frequency and surface dependence of the mechanical loss in fused silica (2005)
Penn, Steven D., Ageev, Alexander, Busby, Dan, Harry, Gregory M., Gretarsson, Andri M., Numata, Kenji, ...
We have compiled measurements of the mechanical loss in fused silica from samples spanning a wide range of geometries and resonant frequency in order to model the known variation of the loss with...
Levinson, Amir, Lee, Hyun Kyu, Regimbau, Tania, Punturo, Michele, Harry, Gregory M.
Gamma-ray bursts are believed to originate in core-collapse of massive stars. This produces an active nucleus containing a rapidly rotating Kerr black hole surrounded by a uniformly magnetized torus...
Levinson, Amir, Lee, Hyun Kyu, Regimbau, Tania, Punturo, Michele, Harry, Gregory M.
Gamma-ray bursts are believed to originate in core-collapse of massive stars. This produces an active nucleus containing a rapidly rotating Kerr black hole surrounded by a uniformly magnetized torus...
Levinson, Amir, Lee, Hyun Kyu, Regimbau, Tania, Punturo, Michele, Harry, Gregory M.
Gamma-ray bursts are believed to originate in core-collapse of massive stars. This produces an active nucleus containing a rapidly rotating Kerr black hole surrounded by a uniformly magnetized torus...
Effects of electrical charging on the mechanical Q of a fused silica disk (2003)
Mortonson, Michael J., Vassiliou, Christophoros C., Ottaway, David J., Shoemaker, David H., Harry, Gregory M.
We report on the effects of an electrical charge on mechanical loss of a fused silica disk. A degradation of Q was seen that correlated with charge on the surface of the sample. We examine a number...
Mechanical Loss in Tantala/Silica Dielectric Mirror Coatings (2003)
Penn, Steven D., Sneddon, Peter H., Armandula, Helena, Betzwieser, Joseph C., Cagnoli, Gianpietro, Camp, Jordan, ...
Current interferometric gravitational wave detectors use test masses with mirror coatings formed from multiple layers of dielectric materials, most commonly alternating layers of SiO2 (silica) and...
Effects of electrical charging on the mechanical Q of a fused silica disk (2003)
Mortonson, Michael J., Vassiliou, Chrisophoros C., Ottaway, David John, Shoemaker, David H., Harry, Gregory M.
Copyright © 2003. Rev.Sci.Instrum. All rights reserved. Printed in U.S.A. Submitted to Cornell University’s online archive www.arXiv.org in 2003 by Gregory M. Harry. Post-print sourced from...
Effects of electrical charging on the mechanical Q of a fused silica disk (2003)
Mortonson, Michael J., Vassiliou, Chrisophoros C., Ottaway, David John, Shoemaker, David H., Harry, Gregory M.
Copyright © 2003. Rev.Sci.Instrum. All rights reserved. Printed in U.S.A. Submitted to Cornell University’s online archive www.arXiv.org in 2003 by Gregory M. Harry. Post-print sourced from...
Harry, Gregory M., Gretarsson, Andri M., Saulson, Peter R., Penn, Steven D., Startin, William J., Kittelberger, Scott, ...
We report on thermal noise from the internal friction of dielectric coatings made from alternating layers of Ta2O5 and SiO2 deposited on fused silica substrates. We present calculations of the...
Comparison of advanced gravitational-wave detectors (2001)
Harry, Gregory M, Houser, Janet L, Strain, Kenneth A
We compare two advanced designs for gravitational-wave antennas in terms of their ability to detect two possible gravitational wave sources. Spherical, resonant mass antennas and interferometers...
High quality factor measured in fused silica (2000)
Penn, Steven D., Harry, Gregory M., Gretarsson, Andri M., Kittelberger, Scott E., Saulson, Peter R., Schiller, John J., ...
We have measured the mechanical dissipation in a sample of fused silica drawn into a rod. The sample was hung from a multiple-bob suspension, which isolated it from rubbing against its support, from...
Gretarsson, Andri M., Rowan, Sheila, Cagnoli, Geppo, Harry, Gregory M., Hough, Jim, Penn, Steven D., ...
The use of fused-silica ribbons as suspensions in gravitational wave interferometers can result in significant improvements in pendulum mode thermal noise. Surface loss sets a lower bound to the...
Effect of Optical Coating and Surface Treatments on Mechanical Loss in Fused Silica (1999)
Gretarsson, Andri M., Harry, Gregory M., Penn, Steven D., Saulson, Peter R., Schiller, John J., Startin, William J.
We report on the mechanical loss in fused silica samples with various surface treatments and compare them with samples having an optical coating. Mild surface treatments such as washing in detergent...
Harry, Gregory M., Jin, Insik, Paik, Ho Jung, Stevenson, Thomas R., Wellstood, Frederick C.
We report on the total noise from an inductive motion transducer for a gravitational-wave antenna. The transducer uses a two-stage SQUID amplifier and has a noise temperature of 1.1 mK, of which 0.70...
Dissipation of mechanical energy in fused silica fibers (1999)
Gretarsson, Andri M., Harry, Gregory M.
For thermal noise considerations of LIGO suspensions, the sources of dissipation in the suspending fibers must be analyzed. To determine the dissipation induced by the surface of fused silica fibers,...
Thesis research directed by Dept. of Physics.
Detectability of gravitational wave events by spherical resonant-mass antennas (1996)
Harry, Gregory M., Stevenson, Thomas R., Paik, Ho Jung
We have calculated signal-to-noise ratios for eight spherical resonant-mass antennas interacting with gravitational radiation from inspiralling and coalescing binary neutron stars and from the...