Background noise analysis of laser interferometer for test of TDI technology on ground
For space gravitational wave detection,as the lengths of laser interferometer arms are not matched,the laser frequency noise cannot be eliminated in common mode,leading to the weak interfering signals being submerged in large residual laser frequency noise.By time-shifting and linearly combining independent interfering signals,laser frequency noise can be greatly eliminated as laser interferometry with virtual equal interferometer arm lengths.Such a technique is called time delay interferometry(TDI).In order to experimentally validate that TDI technique can reduce the influence of laser frequency noise on gravitational wave detection to 3×10-7 Hz/Hz at Fourier frequency of 1 mHz on the ground,it is necessary to analyze the main frequency noise sources of laser interferometer.Based on experimental measurement and calculation analysis,experimental parameters of the laser interferometer are derived to meet the noise requirement of gravitational wave detection,including the maximum length difference between interferometer arms,laser frequency stability,air pressure stability,laser power stability and temperature stability of experimental setups.
laser techniquesgravitational wave detection in spacenoise analysis of laser interferometertime-delay interferometrylaser frequency noise
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