28 July 2008 Can laser self-focusing in air replace interferometer siderostats and delay lines?
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Abstract
Recent experiments in high-power lasers show that they modulate of the density of air at long ranges, up to filamentation in a restricted volume. There are two effects: light concentration and plasma filamentation, depending on the laser power. Two such laser-heated volumes can scatter stellar light into a central station, where they are made to interfere in speckled fringes. Usually the density modulations deflect the light only slightly, so the maximum baseline is not extended. However, if either the modulation of the density of air is strong, or its spatial frequency is high, then the stellar beam deflection is significant. In such a case, the scattering volumes can be further off to the sides, and baselines of hundreds of meters can be envisaged.
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Erez N. Ribak, Erez N. Ribak, } "Can laser self-focusing in air replace interferometer siderostats and delay lines?", Proc. SPIE 7013, Optical and Infrared Interferometry, 70130K (28 July 2008); doi: 10.1117/12.802837; https://doi.org/10.1117/12.802837
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