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Proceedings Paper

Micro- and nanomachining of transparent dielectrics by two short interfered laser pulses
Author(s): Masahiro Hirano; Ken-ichi Kawamura; Hideo Hosono
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Paper Abstract

Single shot irradiation of interfered fs laser pulses allows for encoding non-erasable periodic nano-structures in almost all kinds of materials. However, strong absorption of the intense laser pulses at the material surface and the possible distortion of the pulse due to the non-linear interaction with materials make it very difficult to fabricate embedded structures inside inorganic dielectric materials. We have overcome this difficulty by using chirped pulses from Ti:sapphire fs pulse laser. The chirping stretches laser pulse width from 100 fs to 5 ps without changing the total energy, thus reducing the peak energy of the pulse. Multiple micro-gratings were encoded vertically inside silica glass at a depth of ~5 mm from the surface by using the pulse with an optimized pulse width of 500 fs. The present technique provides unique opportunity to fabricate embedded diffractive devices such as fiber gratings of pure silica fiber, optical couplers in planar waveguides and diffractive gratings in DFB lasers.

Paper Details

Date Published: 16 July 2003
PDF: 7 pages
Proc. SPIE 5061, International Symposium on Photonic Glass (ISPG 2002), (16 July 2003); doi: 10.1117/12.517322
Show Author Affiliations
Masahiro Hirano, Japan Science and Technology Corp. (Japan)
Ken-ichi Kawamura, Japan Science and Technology Corp. (Japan)
Hideo Hosono, Japan Science and Technology Corp. (Japan)
Tokyo Institute of Technology (Japan)

Published in SPIE Proceedings Vol. 5061:
International Symposium on Photonic Glass (ISPG 2002)
Congshan Zhu, Editor(s)

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