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Proceedings Paper

Single-point diamond turning of DAST crystals
Author(s): Yoshiharu Namba; Masahiro Tsukahara; Atsuya Fushiki; Koji Suizu; Hiromasa Ito
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Paper Abstract

Organic nonlinear optical crystal 4-dimethylamino-N-metyl-4-stilbazolium tosylate (DAST) can be used for new optical devices such as high frequency electro-optical sampling wavelength conversion, submillimeter wave generation, and terahertz-wave generation. The crystal is soft, brittle and hygroscopic so that it is very difficult to get optical surfaces by using conventional optical polishing process. This paper deals with single-point diamond turning for getting optical surfaces on DAST crystals. Three typical planes on DAST crystals were finished by single-point diamond turning. The quality of single-point diamond turned surface depends upon the crystallographic plane, cutting direction, cutting speed, depth of cut, feed rate, rake angle, nose radius of diamond tool, tool clearance angle, tool wear, lubricant and its supplying method. The turned surface was measured with a Nomarski interference microscope, atomic force microscope, and a three-dimensional optical profiler. By optimizing the machining conditions, 0.33 nm rms surface roughness and 8.7 nm p-v flatness in 1 mm square were obtained on a b-plane of DAST crystal.

Paper Details

Date Published: 22 December 2003
PDF: 9 pages
Proc. SPIE 5180, Optical Manufacturing and Testing V, (22 December 2003); doi: 10.1117/12.510445
Show Author Affiliations
Yoshiharu Namba, Chubu Univ. (Japan)
Masahiro Tsukahara, Chubu Univ. (Japan)
Atsuya Fushiki, Chubu Univ. (Japan)
Koji Suizu, Tohoku Univ. (Japan)
Hiromasa Ito, Tohoku Univ. (Japan)

Published in SPIE Proceedings Vol. 5180:
Optical Manufacturing and Testing V
H. Philip Stahl, Editor(s)

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