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Challenging optical resonant gain achieved via the use of two geometricallymodematched Fabry-Perot cavities is anticipated in Any Light Particle Search II(ALPS II) to extend the search sensitivity of light-weight sub-eV dark mattercandidates to uncharted parameter space of scientific interest. We report onthe precision optomechanics developed for geometrical modematching of opticalcavities. The general concept, the mechanical mounting scheme, and the use ofan autocollimator to streamline the metrology procedure are rigorously examinedusing optical interferometry, all of which meet the requirements of ALPS II.

Precision optomechanics for geometrically modematched Fabry-Perot cavities in ALPS II