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Optical characterization of ultrahigh diffraction efficiency gratings

 
: Bunkowski, A.; Burmeister, O.; Clausnitzer, T.; Kley, E.-B.; Tünnermann, A.; Danzmann, K.; Schnabel, R.

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Applied optics 45 (2006), No.23, pp.5795-5799
ISSN: 0003-6935
ISSN: 1539-4522
ISSN: 1559-128X
English
Journal Article
Fraunhofer IOF ()
diffraction grating; Fabry-Perot; beam splitter

Abstract
We report on the optical characterization of an ultrahigh diffraction efficiency grating in a first-order Littrow configuration. The apparatus used was an optical cavity built from the grating under investigation and an additional high-reflection mirror. The measurement of the cavity finesse provided precise information about the grating's diffraction efficiency and its optical loss. We measured a finesse of 1580 from which we deduced a diffraction efficiency of (99.635±0.016)% and an overall optical loss due to scattering and absorption of just 0.185%. Such high-quality gratings, including the tool used for their characterization, might apply for future gravitational wave detectors. For example, the demonstrated cavity itself presents an all-reflective, low-loss Fabry-Perot resonator that might replace conventional arm cavities in advanced high-power Michelson interferometers.

: http://publica.fraunhofer.de/documents/N-47213.html