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Spectral broadening in femtosecond laser written waveguides in chalcogenide glass

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Nonlinear spectral broadening to 200 nm, from an initial width of 50 nm, has been demonstrated in gallium lanthanum sulphide glass waveguides from 1540 nm, 200 fs pulses at 30 nJ/pulse. A formation mechanism is presented for these femtosecond laser written waveguides, based on optical characterization and comparisons to previous work. Two different types of waveguide are identified. One has a characteristic long narrow structure and is formed through filamentation caused by self-focusing. The other has a characteristic "teardrop" structure, which is formed by a type IIA photosensitivity mechanism and cumulative heating of glass around a central laser-exposed region.

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Hughes, Mark A., Yang, Weijia and Hewak, D.W. (2009) Spectral broadening in femtosecond laser written waveguides in chalcogenide glass Journal of the Optical Society of America B, 26, (7), pp. 1370-1378. (doi:10.1364/JOSAB.26.001370).

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Published date: 1 July 2009


Local EPrints ID: 163423
ISSN: 0740-3224
PURE UUID: 7a0ac5cd-9879-4c40-b1d4-e3dddcdad54e
ORCID for D.W. Hewak: ORCID iD

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Date deposited: 08 Sep 2010 12:56
Last modified: 18 Jul 2017 12:31

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Author: Mark A. Hughes
Author: Weijia Yang
Author: D.W. Hewak ORCID iD

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