From Event: SPIE Optical Engineering + Applications, 2016
The sensitivity achieved by large ring-laser gyroscopes will make it possible to detect faint relativistic effects related to the rotation of the Earth’s mass. This task requires a strict control of the ring cavity geometry (shape and orientation), which can be performed by a novel network of portable heterodyne interferometers, capable of measuring the absolute distance betweeen two retro-reflectors with a nominal accuracy better than 1nm. First steps have been taken towards the realization of this device and a starting prototype of distance gauge is under development and test.
Alberto Donazzan, Giampiero Naletto, Maria G. Pelizzo, Davide Cuccato, Alessandro Beghi, Antonello Ortolan, Jacopo Belfi, Filippo Bosi, Andreino Simonelli, Nicolò Beverini, Giorgio Carelli, Enrico Maccioni, Rosa Santagata, Alberto Porzio, Angelo Tartaglia, and Angela Di Virgilio, "A network of heterodyne laser interferometers for monitoring and control of large ring-lasers," Proc. SPIE 9960, Interferometry XVIII, 99600G (Presented at SPIE Optical Engineering + Applications: August 31, 2016; Published: 28 August 2016); https://doi.org/10.1117/12.2237638.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon