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Proceedings Paper

Liquid pressure varifocus lens for YAG laser processing
Author(s): Ryoichi Kuwano; Tsuyoshi Tokunaga; Yukitoshi Otani; Norihiro Umeda
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Paper Abstract

A varifocus lens by liquid pressure has been developed to change the focal length from a concave to a convex shape by adjusting the liquid pressure. It consists of a polymer film, an acrylic plate, and liquid and it is filled up with the liquid in its cavity. The deformation of the refraction surface of the lens is analyzed theoretically. An experiment by He-Ne laser is performed with a plano-convex type lens. The dynamic range of the focal length of the convex lens is from 50 mm to 250mm. The application for a YAG laser with 1.06μm of wavelength is demonstrated experimentally. The focus was adjusted along the material surface without moving the optical element. As a result, the control of the beam spot diameter is succeeded. Finally, the laser processing is demonstrated to manufacture Fe compressed powder sheets. Its melting marks along a focus change are formed with a minimum width of 100μm.

Paper Details

Date Published: 5 December 2005
PDF: 4 pages
Proc. SPIE 6048, Optomechatronic Actuators and Manipulation, 604805 (5 December 2005); doi: 10.1117/12.650940
Show Author Affiliations
Ryoichi Kuwano, Tokyo Univ. of Agriculture and Technology (Japan)
Tsuyoshi Tokunaga, Chiba Institute of Technology (Japan)
Yukitoshi Otani, Tokyo Univ. of Agriculture and Technology (Japan)
Norihiro Umeda, Tokyo Univ. of Agriculture and Technology (Japan)

Published in SPIE Proceedings Vol. 6048:
Optomechatronic Actuators and Manipulation
Kee S. Moon, Editor(s)

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