Volume Grating Induced by a Self-Trapped Long Filament of Femtosecond Laser Pulses in Silica Glass (original) (raw)

Published 10 November 2003 • Copyright (c) 2003 The Japan Society of Applied Physics
Japanese Journal of Applied Physics,Volume 42,Number 11RCitation Kazuhiro Yamada et al 2003 Jpn. J. Appl. Phys. 42 6916DOI 10.1143/JJAP.42.6916

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1347-4065/42/11R/6916

Abstract

A self-trapped filament of ultrashort laser pulses can induce a 10–500 µm-long region of refractive-index change in silica glass. The translation of filament perpendicular to the optical axis induces a layer of refractive-index change with a thickness of 2 µm. We stacked the layers periodically and fabricated volume gratings. We irradiated a He–Ne laser beam at the wavelength of 632.8 nm onto the gratings at the Bragg angle. The maximum diffraction efficiency was 74.8% with the grating that had the period of 3 µm and the thickness of 150 µm.

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