Liquid pressure varifocus lens for YAG laser processing

Ryoichi Kuwano; Tsuyoshi Tokunaga; Yukitoshi Otani; Norihiro Umeda

doi:10.1117/12.650940

5 December 2005 Liquid pressure varifocus lens for YAG laser processing

Ryoichi Kuwano, Tsuyoshi Tokunaga, Yukitoshi Otani, Norihiro Umeda

Proceedings Volume 6048, Optomechatronic Actuators and Manipulation; 604805 (2005) https://doi.org/10.1117/12.650940
Event: Optomechatronic Technologies 2005, 2005, Sapporo, Japan

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.

Citation Download Citation

Ryoichi Kuwano, Tsuyoshi Tokunaga, Yukitoshi Otani, and Norihiro Umeda "Liquid pressure varifocus lens for YAG laser processing", Proc. SPIE 6048, Optomechatronic Actuators and Manipulation, 604805 (5 December 2005); https://doi.org/10.1117/12.650940

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