A Mode Selector to Suppress Fluctuations in Laser Beam Geometry

Rüdiger, A.; Schilling, R.; Schnupp, L.; Winkler, W.; Billing, H.; Maischberger, K.

doi:10.1080/713820609

Cited by 107 publications

(71 citation statements)

References 7 publications

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“…In practice, mode cleaners take the form of mediumto high-finesse optical resonators which are feedback controlled to remain on resonance for a chosen laser mode [20]. Mode cleaners are used in several locations in gravitational wave interferometers [21].…”

Section: Performance Of Higher-order Laguerre-gauss Beams In Modementioning

confidence: 99%

Experimental demonstration of higher-order Laguerre-Gauss mode interferometry

et al. 2010

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The compatibility of higher-order Laguerre-Gauss (LG) modes with interferometric technologies commonly used in gravitational wave detectors is investigated. In this paper we present the first experimental results concerning the performance of the LG33 mode in optical resonators. We show that the Pound-Drever-Hall error signal for a LG33 mode in a linear optical resonator is identical to that of the more commonly used LG00 mode, and demonstrate the feedback control of the resonator with a LG33 mode. We succeeded to increase the mode purity of a LG33 mode generated using a spatial-light modulator from 51% to 99% upon transmission through a linear optical resonator. We further report the experimental verification that a triangular optical resonator does not transmit helical LG modes.PACS numbers: 04.80. Nn, 95.75.Kk, 42.50.Tx, 95.55.Ym

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Section: Performance Of Higher-order Laguerre-gauss Beams In Modementioning

confidence: 99%

Experimental demonstration of higher-order Laguerre-Gauss mode interferometry

et al. 2010

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“…15 Beam jitter and beam width fluctuations are, due to the mode selectivity of the power-recycling cavity, partly converted into amplitude fluctuations and partly excite higher-order modes within the power-recycling cavity.…”

Section: A Spatial Stabilitymentioning

confidence: 99%

“…15 The geometry of the power-recycling cavity is defined by the optical pathlength of 2400 m, the radii of curvature of the interferometer mirrors of 600 m and 640 m, FIG. 1.…”

Section: ͑6͒mentioning

confidence: 99%

Mode-cleaning and injection optics of the gravitational-wave detector GEO600

Goßler

Casey

Freise

et al. 2003

Review of Scientific Instruments

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The British-German interferometric gravitational-wave detector GEO600 uses two high-finesse triangular ring cavities of 8 m optical pathlength each, as an optical mode-cleaning system. The modecleaner system is housed in an ultrahigh-vacuum environment to avoid contamination of the optics and to minimize both the influence of refractive index variations of the air and acoustic coupling to the optics. To isolate the cavities from seismic noise, all optical components are suspended as double pendulums. These pendulums are damped at their resonance frequencies at the upper pendulum stage with magnet-coil actuators. A suspended reaction mass supports three coils matching magnets bonded onto the surface of one mirror of each cavity, allowing length control of the modecleaner cavities to maintain resonance with the laser light. A fully automated control system stabilizes the frequency of the slave laser to that of the master laser, the frequency of the master laser to the length of the first modecleaner and the length of the first to the length of the second modecleaner. The control system uses the Pound-Drever-Hall sideband technique and operates autonomously over long time periods with only infrequent human interaction. The duty cycle of the system was measured to be 99.7% during an 18 day period. The throughput of the whole modecleaner system is about 50%. In this article, we give an overview of the mechanical and optical setup and the achieved performance of the double modecleaner system.

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“…(Note that the mirrors used in the DL4 scheme do not need to be transparent.) Elaborate methods of attaching the suspending 'wires' are required so as not to compromise the intrinsic Q. Glasgow and Hannover have worked out viable solutions, and Q values of 5×10 6 and better have been achieved with fused silica mirrors. This internal noise is responsible for the rather shallow portion of the curve 'thermal noise' in Fig.3, above 50 Hz.…”

Section: Thermal Noisementioning

confidence: 99%

“…fluctuations in position, orientation, and shape of the beam, are greatly reduced by the use of 'mode-cleaners' first introduced by the GEO groups [6,7]. GEO 600 will use two in series, and intensive work was done at Glasgow.…”

Section: Laser Noisementioning

confidence: 99%

The GEO 600 Gravitational Wave Detector Status, Research, Development

Rüdiger

Danzmann

Gyros, Clocks, Interferometers...: Testing Relativistic Graviy in Space

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Abstract. The last few years have brought a great break-through in the quest for earth-bound detection of gravitational waves: at five sites, laser-interferometric detectors, of armlengths from 0.3 to 4 km, are being built. These projects have in common that one prominent noise source, the shot noise, is reduced by the use of power recycling. By using advanced optical technologies early on, the German-British project GEO 600, although only intermediate in size (600 m), has good chances for a competitive sensitivity, at least with the first versions of the larger detectors. Particularly the use of the so-called signal recycling technique will allow to search for faint sources of only slowly varying frequency (pulsars, close binaries). The talk will describe the particular topology of the GEO 600 interferometer, characterized by the use of a four-pass delay line and signal recycling. The major noise sources, and the experimental effort aiming at their reduction, will be discussed. The current status of the construction of GEO 600 will be outlined (civil engineering, vacuum, optics). The research and development activities at the experimental sites (Garching, Glasgow, Hannover) will be given broad emphasis. First science runs of GEO 600, well in time with those of other ground-based interferometers, are expected in the year 2001.

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A Mode Selector to Suppress Fluctuations in Laser Beam Geometry

Cited by 107 publications

References 7 publications

Experimental demonstration of higher-order Laguerre-Gauss mode interferometry

Experimental demonstration of higher-order Laguerre-Gauss mode interferometry

Mode-cleaning and injection optics of the gravitational-wave detector GEO600

The GEO 600 Gravitational Wave Detector Status, Research, Development

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