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Proceedings Paper

Reversible dark-center diffraction of metal film in micromachining
Author(s): Jin Xie; Changhe Zhou
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Paper Abstract

When we utilized femtosecond laser to micromachine Cr film with glass substrate, we found reversible dark-center diffraction of the transmitted probe beam passing through the chromium film and reversible bright-center diffraction of the reflected probe beam from the chromium film, which are induced by the pump femtosecond laser. The dark-center diffraction of the transmitted probe beam and the bright-center diffraction of the reflected probe beam appear and disappear with and without the pump beam. A view of diffractive optics with binary phase plate is put forward, which explains the reversible dark-center diffractive optical phenomenon. The pre-ablated hole on the metal film can be regarded as a uniform light filed without phase modulation, the surrounding circular part around the pre-ablated hole can be regarded as "phase modulated". Therefore, this diffraction optic view might be helpful for us to understand the phase change of the metal film introduced by the femtosecond laser pulse.

Paper Details

Date Published: 22 May 2009
PDF: 5 pages
Proc. SPIE 7282, 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, 728223 (22 May 2009); doi: 10.1117/12.830897
Show Author Affiliations
Jin Xie, Shanghai Institute of Optics and Fine Mechanics (China)
Changhe Zhou, Shanghai Institute of Optics and Fine Mechanics (China)


Published in SPIE Proceedings Vol. 7282:
4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies
Li Yang; John M. Schoen; Yoshiharu Namba; Shengyi Li, Editor(s)

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