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Proceedings Paper

Volume gratings and welding of glass/plastic by femtosecond laser direct writing
Author(s): Wataru Watanabe
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Paper Abstract

Femtosecond laser direct writing is used to fabricate diffractive optical elements in three dimensions and to weld glass and/or plastic. In this paper, we review volume gratings in plastics and welding of glass/plastic by femtosecond laser direct writing. Volume gratings were embedded inside polymethyl methacrylate (PMMA) by femtosecond laser pulses. The diffraction efficiency of the gratings increased after fabrication and reached the maximum. After an initial slow decrease within first several days after the fabrication, the efficiency increased again. This phenomena was called regeneration of the grating. We also demonstrate welding of PMMA by dendrite pattern using femtosecond laser pulses. Laser pulses are focused at the interface of two PMMA substrates with an air gap and melted materials in laser-irradiated region spread within a gap of the substrates and dendrite morphology of melted PMMA was observed outside the laser irradiated area. Finally, we show welding of glass/plastic and metal.

Paper Details

Date Published: 2 January 2018
PDF: 8 pages
Proc. SPIE 10456, Nanophotonics Australasia 2017, 104562L (2 January 2018); doi: 10.1117/12.2282889
Show Author Affiliations
Wataru Watanabe, Ritsumeikan Univ. (Japan)

Published in SPIE Proceedings Vol. 10456:
Nanophotonics Australasia 2017
James W. M. Chon; Baohua Jia, Editor(s)

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