Optical elements for radiation comprising graphite films

Details Optical elements for radiation comprising graphite films Optical elements for radiation comprising graphite films

1989-02-27

1991-08-20

Fields, Carolyn E.

X-ray or gamma ray systems or devices

Beam control

378 84, 378 85, G21K 106

Patent

active

050420593

ABSTRACT:
Optical elements for radiation comprising a graphite film obtained from a film of a polymer such as polyphenylene oxadiazole, polybenzothiazole, polybenzobisthiazole, polybenzooxazole, polybenzobisoxazole, polypyromellitimide, polyphenylene isophthalamide, polyphenylene benzoimidazole, polyphenylene benzobisimidazole, polythiazole or poly-p-phenylene-vinylene. The graphite film is obtained by pyrolysis of the polymer film at 2800.degree. C. or higher at a pressure of not lower than 4 kg/cm.sup.2 in vacuum or in an inert gas. Alternatively, the element may be made of a graphite film obtained from the polymers mentioned above and intercalated with a metal halide. The intercalated films are readily bonded by pressing in the form of a thick sheet or block. Still alternatively, the graphite films and the intercalated films may be superposed alternately and bonded by pressing, or the intercalated films may be sandwiched between the graphite films and bonded together to form a thick sheet or block. The optical element has application as a lens, monochromater, filter or analyzer for radiations.

REFERENCES:
patent: 4749514 (1988-06-01), Murakami et al.
patent: 4788703 (1988-11-01), Murakami et al.
patent: 4842665 (1989-06-01), Taguchi et al.
Applied Physics Letters, vol. 48, No. 23, Jun. 1986, pp. 1594-1596; M. Murakami et al.: "High-Quality Pyrographite Films".
Synthetic Metals, vol. 18, Feb. 1987, pp. 497-502, Elsevier Sequoia, Lausanne; T. Onishi et al.: "Preparation of Graphite Film by Pyrolysis of Polymers".

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