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Proceedings Paper

Deposition and laser damage tests of DLC coatings on silica optical fibers and plates
Author(s): Serge V. Garnov; Victor G. Ralchenko; S. A. Uglov; Sergei M. Klimentov; Andrey A. Smolin; E. D. Obraztsova; V. E. Strelnitsky; A. V. Semenov; Viacheslav M. Puzikov; Bruce E. Warner
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Paper Abstract

We report on deposition and laser damage test of DLC coatings on silica plates and tip of 0.4 mm diameter fibers. The carbon films were produced by three techniques: (i) pulsed CO2 laser sputtering of glassy carbon targets in high vacuum; (ii) mono-energetic carbon ion beam deposition; and (iii) R.F. plasma deposition in benzene. Raman spectroscopy, ellipsometry and scratch tests were used to characterize structure, optical constants n and k, and adhesion of the films. The 20 ns pulses of a Q-switched YAG:Nd laser emitted at 1.06 micrometers were used to determine the laser damage threshold fluence, Wd, of the films. The R.F. plasma deposited coatings have demonstrated the highest values of Wd equals 18-22 J/cm2. A combination of small thickness, relatively low absorption, and good adhesion were the key to the success for these films. In spite of lower absorption the a-C films deposited by ion beam technique showed poorer resistance to laser shots because of insufficient adhesion. The a-C films produced by CO2 laser sputtering have shown very low damage thresholds because of high absorption. Attempts to grow polycrystalline diamond films on silica fibers are also described.

Paper Details

Date Published: 20 October 1998
PDF: 6 pages
Proc. SPIE 3484, Lasers in Synthesis, Characterization, and Processing of Diamond, (20 October 1998); doi: 10.1117/12.328202
Show Author Affiliations
Serge V. Garnov, General Physics Institute (Russia)
Victor G. Ralchenko, General Physics Institute (Russia)
S. A. Uglov, General Physics Institute (Russia)
Sergei M. Klimentov, General Physics Institute (Russia)
Andrey A. Smolin, General Physics Institute (Russia)
E. D. Obraztsova, General Physics Institute (Russia)
V. E. Strelnitsky, Institute of Physics and Technology (Ukraine)
A. V. Semenov, Institute of Single Crystals (Ukraine)
Viacheslav M. Puzikov, Institute of Single Crystals (Ukraine)
Bruce E. Warner, Lawrence Livermore National Lab. (United States)

Published in SPIE Proceedings Vol. 3484:
Lasers in Synthesis, Characterization, and Processing of Diamond
Vitali I. Konov; Victor G. Ralchenko, Editor(s)

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