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Proceedings Paper

Axisymmetric deformation of rotating liquid mirrors by laser heating
Author(s): German Da Costa
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Paper Abstract

Deformation of rotating liquid surfaces by laser heating is experimentally and theoretically studied. A horizontal plate containing the liquid sample (crude oil with highly temperature-dependent viscosity and surface tension) turns around a vertical axis fixed in the inertial reference frame at an angular speed continuously variable between 0 and 60 rpm. The liquid surface then adopts a classic parabolic profile which works as a convergent mirror for incoming light beams. The liquid surface is smooth and quite insensitive to external vibrations due to its high viscosity. In the next step a CW, CO2 laser beam parallel to the rotation axis and also at rest in the inertial frame impinges the rotating liquid surface at a given distance from the rotation axis. While the liquid turns, a circular groove is thus ploughed in the liquid surface as a result of the surface tension temperature dependence. The resulting surface profile adopts an axisymmetric stationary shape after a transient heating stage. Its 3D shape at varying turning speed and laser power is experimentally studied by classic fringe-projection techniques. In spite of the low light-reflectivity of the liquid sample, which impedes its practical application in image-forming instruments, the device is useful to build up prototypes of rotating mirrors and to investigate the optical effect of axisymmetric perturbations in their surface profiles.

Paper Details

Date Published: 30 August 2005
PDF: 9 pages
Proc. SPIE 5867, Optical Modeling and Performance Predictions II, 58670L (30 August 2005); doi: 10.1117/12.615416
Show Author Affiliations
German Da Costa, Univ. Simon Bolivar (Venezuela)

Published in SPIE Proceedings Vol. 5867:
Optical Modeling and Performance Predictions II
Mark A. Kahan, Editor(s)

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