LISA laser noise cancellation test using time-delayed interferometry

Andreas C. Kuhnert; Robert Spero; Alexander R. Abramovici; Bonny L. Schumaker; Daniel A. Shaddock

doi:10.1117/12.461501

26 February 2003 LISA laser noise cancellation test using time-delayed interferometry

Andreas C. Kuhnert, Robert Spero, Alexander R. Abramovici, Bonny L. Schumaker, Daniel A. Shaddock

Proceedings Volume 4856, Gravitational-Wave Detection; (2003) https://doi.org/10.1117/12.461501
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

Abstract

The Laser-Interferometer-Space-Antenna (LISA) is a space-based interferometer with arm lengths of 5*10 9 m. Its design goal is to measure gravitational waves with a strain sensitivity of 10-23 at 10 mHz. Unlike in earth-based interferometers the arm lengths can differ by up to 2% or 108 m. For that reason frequency noise in the λ ~ 1 μm laser will not cancel in the direct interference signal. A laser locked to a ULE reference cavity in a 1°μK/square root Hz environment will have about 10 Hz/square root Hz frequency noise. The LISA sensitivity goal requires for the laser noise of less than 10-5 Hz/square root Hz, about a factor 10^-6 below what has been achieved (1). Cancellation of laser frequency noise can be achieved by time-delayed-interferometry (TDI) (2,3). We describe a laboratory test of TDI with an unequal arm interferometer. The intent is to ascertain the performance limitations and proof-of-concept for 6 orders of magnitude frequency noise suppression.

Citation Download Citation

Andreas C. Kuhnert, Robert Spero, Alexander R. Abramovici, Bonny L. Schumaker, and Daniel A. Shaddock "LISA laser noise cancellation test using time-delayed interferometry", Proc. SPIE 4856, Gravitational-Wave Detection, (26 February 2003); https://doi.org/10.1117/12.461501

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