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      Demonstration of the length stability requirements for ALPS II with a high finesse 10m cavity

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          Abstract

          Light-shining-through-a-wall experiments represent a new experimental approach to search for undiscovered elementary particles not accessible with accelerator based experiments. The next generation of these experiments, such as ALPS II, require high finesse, long baseline optical cavities with fast length control. In this paper we report on a length stabilization control loop used to keep a cavity resonant with light at a wavelength of 532nm. It achieves a unity-gain-frequency of 4kHz and actuates on a mirror with a diameter of 50.8mm. This length control system was implemented on a 10m cavity and its projected performance meets the ALPS II requirements. The finesse of this cavity was measured to be 93,800\(\pm\)500 for 1064nm light, a value which is close to the design requirements for the ALPS II regeneration cavity.

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          Laser phase and frequency stabilization using an optical resonator

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            First lower limits on the photon-axion-like particle coupling from very high energy gamma-ray observation

            The intrinsic flux of very high energy (VHE, Energy > 100 GeV) gamma-rays from extragalactic sources is attenuated due to pair production in the interaction with photons of the extragalactic background light (EBL). Depending on the distance of the source, the Universe should be opaque to VHE photons above a certain energy. However, indications exist that the Universe is more transparent than previously thought. A recent statistical analysis of a large sample of VHE spectra shows that the correction for absorption with current EBL models is too strong for the data points with the highest attenuation. An explanation might be the oscillation of VHE photons into hypothetical axion-like particles (ALPs) in ambient magnetic fields. This mechanism would decrease the opacity as ALPs propagate unimpeded over cosmological distances. Here, a large sample of VHE gamma-ray spectra obtained with imaging air Cherenkov telescopes is used to set, for the first time, lower limits on the photon-ALP coupling constant over a large range of ALP masses. The conversion in different magnetic field configurations, including intra-cluster and intergalactic magnetic fields together with the magnetic field of the Milky Way, is investigated taking into account the energy dependence of the oscillations. For optimistic scenarios of the intervening magnetic fields, a lower limit on the photon-ALP coupling of the order of \(10^{-12}\mathrm{GeV}^{-1}\) is obtained whereas more conservative model assumptions result in \(2\times10^{-11}\mathrm{GeV}^{-1}\). The latter value is within reach of future dedicated ALP searches.
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              Production and detection of light bosons using optical resonators

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                Author and article information

                Journal
                18 October 2017
                Article
                1710.06634
                cbfa44a8-ad1a-40ea-9f21-c2a9cfdc21d4

                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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                Custom metadata
                DESY 17-149
                physics.ins-det physics.optics

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