Deposition and laser damage tests of DLC coatings on silica optical fibers and plates

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

doi:10.1117/12.328202

20 October 1998 Deposition and laser damage tests of DLC coatings on silica optical fibers and plates

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

Author Affiliations +

Proceedings Volume 3484, Lasers in Synthesis, Characterization, and Processing of Diamond; (1998) https://doi.org/10.1117/12.328202
Event: Lasers in Synthesis, Characterization, and Processing of Diamond, 1997, Tashkent, Uzbekistan

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, W_d, of the films. The R.F. plasma deposited coatings have demonstrated the highest values of W_d 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.

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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, and Bruce E. Warner "Deposition and laser damage tests of DLC coatings on silica optical fibers and plates", Proc. SPIE 3484, Lasers in Synthesis, Characterization, and Processing of Diamond, (20 October 1998); https://doi.org/10.1117/12.328202

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