Opto-mechanical architecture of the LISA instrument

Weise, Dennis; Marenaci, Pierangelo; Weimer, Peter; Berger, Marcel; Schulte, Hans Reiner; Gath, Peter; Johann, Ulrich

doi:10.1117/12.2308192

Cited by 5 publications

References 3 publications

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The LISA interferometer: impact of stray light on the phase of the heterodyne signal

Sasso

Mana

Mottini

2019

Class. Quantum Grav.

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The Laser Interferometer Space Antenna is a foreseen gravitational wave detector, which aims to detect 10 −20 strains in the frequency range from 0.1 mHz to 1 Hz. It is a triangular constellation, with equal sides of 2.5 × 10 9 m, of three spacecrafts, where heterodyne interferometry measures the spacecraft distances. The stray light from the powerful transmitted beam can overlap with the received one and interfere with the heterodyne signal. We investigated the contribution of random phase variations of the stray photons to the noise of the heterodyne signal. A balanced detection scheme more effectively mitigates this adverse effect than a separation of the frequencies of the transmitted and local radiation. In the balanced scheme, in order to limit the phase noise to picometer level, the incoherent power of the stray light must be kept below about 10 nW/W for an asymmetry of the recombination beam splitter of 1%.

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The LISA interferometer: impact of stray light on the phase of the heterodyne signal

Sasso

Mana

Mottini

2019

Class. Quantum Grav.

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Time-delay interferometry infinity for tilt-to-length noise estimation in LISA

Houba

Delchambre

Hechenblaikner

et al. 2023

Class. Quantum Grav.

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The Laser Interferometer Space Antenna (LISA) mission is a space-borne observatory designed to detect and characterize gravitational wave sources inaccessible to ground-based detectors. The mission relies on laser interferometry to measure changes in space-time. In this context, non-avoidable noise sources within the LISA system, including tilt-to-length coupling, reduce the detector's resolution and complicate achieving the mission's goals unless appropriate mitigation strategies are implemented. This paper applies Time-Delay Interferometry Infinity (TDI-∞) for tilt-to-length noise estimation in LISA and assesses its suitability from the perspective of system identification and calibration for the first time. The recently published TDI-∞ concept indicates a different frequency response within the LISA measurement band compared to the standard methodology of TDI second-generation. Our main contribution is demonstrating the advantages of the TDI-∞ algorithm for tilt-to-length noise calibration in space-borne interferometer constellations. Specifically, we show that this algorithm improves the estimation performance of tilt-to-length noise due to its frequency behavior while requiring less computation time. The reduction in computational effort afforded by the TDI-∞ algorithm accelerates the availability of calibrated TDI data for astrophysical analysis if required by the LISA science community. The improvement in estimation performance underscores the concept's potential to enhance the detector's sensitivity further.

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A fast steering mirror with ultra-low geometric tilt-to-length coupling noise for space-borne gravitational wave detection

Wu,

Hai,

Fang

et al. 2023

Meas. Sci. Technol.

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The misalignment between the geometric center and rotation center in fast steering mirrors (FSMs) poses a challenge for space-borne gravitational wave detection, as it results in geometric tilt-to-length (TTL) coupling noise. To address this issue, we have proposed a FSM structure that exhibits ultra-low geometric TTL coupling noise. The geometric TTL coupling noise is analyzed and evaluated strictly considering the FSM non-ideal tilt of the plane and the center shift characteristic of cartwheel flexure hinges under a small rotational angle. Compared to traditional FSM designs, our new design offers superior noise suppression capabilities and is capable of meeting the stringent piston effect noise requirements of 0.2 pm / Hz in the frequency band of 10 − 4 Hz ∼ 1 Hz under ideal conditions.

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Opto-mechanical architecture of the LISA instrument

Cited by 5 publications

References 3 publications

The LISA interferometer: impact of stray light on the phase of the heterodyne signal

The LISA interferometer: impact of stray light on the phase of the heterodyne signal

Time-delay interferometry infinity for tilt-to-length noise estimation in LISA

A fast steering mirror with ultra-low geometric tilt-to-length coupling noise for space-borne gravitational wave detection

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