= Beam Profilers for large beams = '''''Related subgroups:''''' IOO, MIF, VAC ---- '''[[KAGRA/Subgroups/AOS| back to AOS top]]''' <> == Scope == . The Beam Profilers for large beams is to be used to check the beam mode (power spacial distribution) during the commissioning phase of the intereferometer. == Current Status == * [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=872|JGW-T1200872]] == General Description == . The mode matching is one of the important step to operate an optical cavity, and thus a beam profiler can help the commissioning phase. . For KAGRA, the beam size will become about 100 mm diameter. . There seems no commercial products that is able to measure such a large beam size so far, and we will develop such a tool. === Functions === * Measuring a spatial distribution of intensities of a laser beam for 300 mm diameter. * Visualizing the measured data on site and remote in real time (live view). * Offering any other functions that are usually equipped in commercial beam profilers. (Fit-function of the measured data with Gaussian profile, Functions of statistical processing, Functions of exporting the measured data) === Locations === . Anywhere in the initial alignment phase.