High-power laser system for Advanced Virgo gravitational wave detector : coherently combined master oscillator fiber power amplifiers

Abstract : Virgo is a cavity-enhanced Michelson interferometer built for the direct detection of gravitational waves. The Advanced Virgo project consists of major upgrades to the Virgo gravitational wave detector for an order of magnitude improvement in differential strain sensitivity, one of which is the tenfold increase in injected laser power to 175 Watts. The use of fiber laser amplifiers and their coherent combination are foreseen to deliver the required high-power low-noise beam. In this thesis work, we review the laser requirements for gravitational wave detectors, introduce the design of the laser system for Advanced Virgo, and develop the means for laser characterization in accordance with the stringent noise specifications. We then present the results to date, notably the quasi-continuous long-term operation of two 40-Watt fiber laser amplifiers over thousands of hours and their coherent combination with Mach-Zehnder interferometry. Although the targeted power for Advanced Virgo is not yet attained, the developed system shows decent noise performance and is promising for further power-scaling efforts.
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Li-Wei Wei. High-power laser system for Advanced Virgo gravitational wave detector : coherently combined master oscillator fiber power amplifiers. Other [cond-mat.other]. Université Nice Sophia Antipolis, 2015. English. ⟨NNT : 2015NICE4091⟩. ⟨tel-01284969⟩

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