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Proceedings Paper

Doppler Laser Interferometry With Light Transmission By Two Optical Fibers
Author(s): Serge Gidon; Guy Garcin; Herve Behar
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Paper Abstract

A previous velocity interferometer used in high-explosive experiments, giving high resolution data by means of a rotating mirror streak camera, has been modified in order to transmit light in two optical fibers and to record on an electronic streak camera ; in both cases, Doppler shift is analysed by a Fabry-Perot interferometer. Experimental arrangement is described in two channels : The emitting channel is composed of : - An argon ion laser and a high speed mechanical shutter which allows light to pass only during the shot duration : so the experimental set up with explosive will not get hot and the camera noise will be reduced. - An optical system focusing the laser beam into the fiber. - An optical fiber, linking together the laboratory and the firing table, ended by a pick-up head included in the experimental set up. The receiving channel is composed of : - a second optical fiber coming from the above head, - a Fabry-Perot interferometer included in an optical system, - a streak camera with its slit and a lens. The optical system made of spherical and cylindrical lenses performs two functions : (i) it displays the fringe pattern onto the entrance slit of the camera, two or three fringes, (ii) it realizes a good light transfer between the geometries of the circular light source, the fiber, and the rectangular slit ; this is an anamorphosis. Light transmission has been separated into two different fibers in order to avoid, on the time-resolved interferogram, static fringes induced by the laser light reflected by dioptric surfaces. Experiments carried out with this new arrangement have given good results in terms of accuracy, homogeneity and duration of records. Utilization and adjustments are easier than in the previous case. Thanks to its small size, the pick-up head can be integrated in experiments of detonics in any environment, even at some distance from the laboratory.

Paper Details

Date Published: 1 February 1985
PDF: 5 pages
Proc. SPIE 0491, 16th Intl Congress on High Speed Photography and Photonics, (1 February 1985); doi: 10.1117/12.968032
Show Author Affiliations
Serge Gidon, C.E.A. - C.E.V. (France)
Guy Garcin, C.E.A. - C.E.V. (France)
Herve Behar, C.E.A. - C.E.V. (France)

Published in SPIE Proceedings Vol. 0491:
16th Intl Congress on High Speed Photography and Photonics
Michel L. Andre; Manfred Hugenschmidt, Editor(s)

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