| Autor: |
Victor Ralchenko, A. V. Semenov, V. M. Puzikov, Bruce E. Warner, S. A. Uglov, Sergei M. Klimentov, V. E. Strelnitsky, Serge V. Garnov, A.A. Smolin, Elena D. Obraztsova |
| Rok vydání: |
1998 |
| Předmět: |
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| Zdroj: |
Lasers in Synthesis, Characterization, and Processing of Diamond. |
| ISSN: |
0277-786X |
| DOI: |
10.1117/12.328202 |
| Popis: |
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.© (1998) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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