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6 December 2010 Oil-contamination problem in large-scale pulse-compressor
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A heavy oil-contamination was observed on the optical components in LFEX pulse compressor. This contamination came from the wall of compression chamber, and the damage threshold of the mirror dropped to 1/2 or1/3 of the original value. The same contamination was observed in different compression chambers in our institute. The contamination materials were identified as Paraffin-oil and DBP (Di-n-butyl phthalate). Several cleaning schemes were tried, but no significant improvement was obtained. Finally, we found well-baked silica gel placed in the vacuum chamber improved the contamination very much. In a small vacuum chamber, the damage threshold increase by 3 times, and this result indicated the contamination of damage test sample. We also tried to remove contamination with dipping optics in the water-alcohol mixture, and we obtained almost the same improvements with the silica gel.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
T. Jitsuno, H. Murakami, S. Motokoshi, E. Saato, K. Mikami, K. Kato, T. Kawasaki, Y. Nakata, N. Sarukura, T. Shinizu, H. Shiraga, N. Miyanaga, and H. Azechi "Oil-contamination problem in large-scale pulse-compressor", Proc. SPIE 7842, Laser-Induced Damage in Optical Materials: 2010, 784221 (6 December 2010);

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