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Proceedings Paper

Second harmonic optimization of a hologram
Author(s): S. Hasegawa; Y. Hayasaki
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Paper Abstract

Precise control of diffraction peaks of a hologram is indispensable in holographic femtosecond laser processing. To obtain the uniform diffraction peaks, an adaptive optimization due to the diffraction peaks measured by an image sensor was proposed. It used a one-photon absorption. However, the structure processed by a femtosecond laser pulse was based on multi-photon absorptions. Therefore, a mismatch between the optimized diffraction peaks and the processed structures was observed. An adaptive optimization method using second harmonics induced by parallel pulse irradiations to a nonlinear optical crystal is proposed to solve this mismatch.

Paper Details

Date Published: 17 February 2010
PDF: 8 pages
Proc. SPIE 7584, Laser Applications in Microelectronic and Optoelectronic Manufacturing XV, 758414 (17 February 2010); doi: 10.1117/12.841929
Show Author Affiliations
S. Hasegawa, Utsunomiya Univ. (Japan)
Y. Hayasaki, Utsunomiya Univ. (Japan)

Published in SPIE Proceedings Vol. 7584:
Laser Applications in Microelectronic and Optoelectronic Manufacturing XV
Hiroyuki Niino; Michel Meunier; Bo Gu; Guido Hennig; Jan J. Dubowski, Editor(s)

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