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• W3203780611 abstract "Ultra-stable light sources are needed for many high precision experiments, such as interferometric gravitational wave detectors. The all-solid-state injection locked high power laser system implemented in the gravitational wave detector GEO600, which is already intrinsically stable, must be actively stabilised in its observables to satisfy the ambitious requirements. In particular the frequency and the intensity of the Nd:YAG laser system must be stabilised to a level of Df = 2 · 10−4 Hz/p Hz in frequency noise (relative to the power recycling cavity) respectively DP/P = 5 · 10−8/p Hz in relative intensity noise, both in the frequency band from 50 Hz to 5 kHz. Achieving this level of intensity stability is one focus of this work. With an intensity stabilisation control electronics designed in the scope of this work an out-of-loop intensity noise of the GEO laser system of DP/P = 2 · 10−8/p Hz at f = 2 kHz is achieved with a detection scheme in air; in vacuum behind a spatial mode filter the out-of-loop intensity noise of the identical lab laser system is reduced to a level of DP/P = 3 · 10−8/p Hz in the bandwidth from f = 100 Hz to f = 1 kHz. Parasitic coupling of noise from one laser observable into another complicates the task of laser stabilisation. An understanding of the couplings is therefore necessary if fundamental limits of laser noise are to be approached. In the further course of this work novel stabilisation schemes for simultaneous suppression of intensity and frequency noise in solid-state lasers are presented. For these investigations a special laser was designed, the single-mode NPRO. Intensity stabilisation of its single-mode laser diode pump source – pump light stabilisation – leads to a reduction of NPRO intensity noise, in itself a result not attainable with a conventional NPRO. Additionally, the frequency noise of the single-mode NPRO is suppressed to the same degree as the intensity noise, without direct detection of the frequency noise. Frequency stabilisation of the single-mode NPRO via feedback to the drive current of the single-mode pump laser diode – current lock – yields a simultaneous intensity noise reduction in the same order of magnitude as the frequency noise suppression. Simultaneous noise reductions in the 30 dB range were achieved with both techniques. The experiments and their results are unprecedented in the field of laser stabilisation. They are highly promising for the development of laser stabilisations for future generation gravitational wave detectors." @default.
• W3203780611 created "2021-10-11" @default.
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• W3203780611 date "2013-04-12" @default.
• W3203780611 modified "2023-09-27" @default.
• W3203780611 title "Gravitational waves in a new light: Novel stabilisation schemes for solid-state lasers" @default.
• W3203780611 hasPublicationYear "2013" @default.
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