GRAvitational-waves Science&technology Symposium (GRASS 2022)

Session

Wavefront sensing and control

WFSC

7 Jun 2022, 15:20

Sala Paladin (Palazzo Moroni, Padova)

43. Wavefront sensing and control in Gravitational Wave detectors

Antonio Perreca (Università di Trento, TIFPA-INFN)

07/06/2022, 15:20

Wavefront sensing and control

Invited Talk

In the past decades the sensitivities of gravitational wave detectors have been improved leading to the detection of more than 90 events. The detection rate should dramatically increase as the sensitivity of the interferometers improves. The LIGO/Virgo/Kagra Scientific Collaboration will increase the range and the sensitivity of gravitational wave interferometers by applying new techniques...

6. A testbed for Tilt-To-Length coupling and Differential-Wavefront-Sensing performance in LISA

Alvise Pizzella (Albert Einstein Institute Hannover)

07/06/2022, 15:50

Wavefront sensing and control

Contributed Talk

The LISA mission, which has been accepted by ESA as the ESA-L3 Gravitational Wave Mission, aims at measuring gravitational waves in the sub-Hz band using inter-spacecraft interferometry. LISA consists in a constellation of three satellites in triangle formation with 2.5 Gm-long arms following along an Earth-like heliocentric orbit. The target sensitivity of pm/Hz1/2 presents unprecedented...

30. Tilt-to-Length noise in interferometric GWO in presence of wavefront aberrations

Carlo Sasso (Istituto Nazionale di Ricerca Metrologica)

07/06/2022, 16:10

Wavefront sensing and control

Contributed Talk

We investigated the tilt-to-length contribution to the measure of the distance of the LISA satellites at the vertexes of the triangular constellation [1]. The aberrations of the beam wavefront have been introduced using Zernike polynomials. This greatly limited the spatial frequency of the considered aberrations and the study of local defects due to the optics traversed by the measuring beam....

3. Wavefront Sensing with a Coupled Cavity for Torsion-Bar Antenna

Ms Yuka Oshima (University of Tokyo)

07/06/2022, 17:05

Wavefront sensing and control

Contributed Talk

Torsion-Bar Antenna (TOBA) is a ground-based gravitational wave detector using a torsion pendulum. The resonant frequency of torsional motion is ~1 mHz, therefore TOBA has good design sensitivity of $10^{-19} \, / \sqrt{\mathrm{Hz}}$ at 0.1 Hz in low frequencies (0.1 Hz – 10 Hz). TOBA can detect intermediate mass black hole binary mergers, Newtonian noise, and so on. A prototype detector...

38. Mode matching sensing through RF Higher Order Modulation

Gabriella Chiarini (Istituto Nazionale di Fisica Nucleare)

07/06/2022, 17:25

Wavefront sensing and control

Contributed Talk

Quantum noise is a fundamental limit in Gravitational Waves (GW) detectors and is made up of shot noise (SN) at high frequencies (above about 100Hz) and radiation pressure noise (RPN) at lower frequencies. To reduce this noise, GW interferometers use a technique called squeezing with which we can improve only one of the contributions, while worsening the other: so far, the choice has been to...

16. Astigmatic mode mismatch sensing for the next gravitational wave detectors.

Andrea Grimaldi (TIFPA-INFN)

07/06/2022, 17:45

Wavefront sensing and control

Contributed Talk

One of the main limits of the Quantum Noise Reduction in Gravitational Wave detectors is the optical losses generated by the mismatch between the vacuum squeezed beam and the resonant cavities of the interferometer. In order to correct those aberrations, we need to be able to measure them. For this reason, different efforts have been made to develop wave-front sensing techniques to measure the...