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19 February 2003 Control of positions and shapes of voids in transparent materials with femtosecond laser
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Proceedings Volume 4830, Third International Symposium on Laser Precision Microfabrication; (2003) https://doi.org/10.1117/12.486547
Event: LAMP 2002: International Congress on Laser Advanced Materials Processing, 2002, Osaka, Japan
Abstract
When femtosecond laser pulses are tightly focused inside the bulk of transparent materials, the intensity in a focal volume becomes high enough to produce submicrometer-scale structural modifications. This damage was shown to be a cavity or a void surrounded by densified material. An array of voids can be used as optical data storages or gratings. We showed the control experiment of the positions and shapes of voids insider transparent materials with femtosecond laser pulses. We have demonstrated the experiments involving optical movement of a void along the optical axis by translation of the focal spot with femtosecond laser pulses. Irradiation of femtosecond laser pulses moves a void inside calcium fluoride and silica glass without any mechanical translations of the optical system up to 2 micron. In this paper, we show that the shapes of voids can be controlled by the spatial profile of incident laser pulses. Finally we show that the fabrication of a Fresnel lens inside silica glass.
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Wataru Watanabe, Kazuhiro Yamada, Daisuke Kuroda, Taishi Shinagawa, Kazuyoshi Itoh, and Junji Nishii "Control of positions and shapes of voids in transparent materials with femtosecond laser", Proc. SPIE 4830, Third International Symposium on Laser Precision Microfabrication, (19 February 2003); https://doi.org/10.1117/12.486547
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