Spectral broadening in femtosecond laser written waveguides in chalcogenide glass
Spectral broadening in femtosecond laser written waveguides in chalcogenide glass
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.
1370-1378
Hughes, Mark A.
2306bfa8-7474-43ee-bf89-01bb035889bb
Yang, Weijia
ecad1a03-22e3-4a91-b6e6-a5f8660e2ab4
Hewak, D.W.
87c80070-c101-4f7a-914f-4cc3131e3db0
1 July 2009
Hughes, Mark A.
2306bfa8-7474-43ee-bf89-01bb035889bb
Yang, Weijia
ecad1a03-22e3-4a91-b6e6-a5f8660e2ab4
Hewak, D.W.
87c80070-c101-4f7a-914f-4cc3131e3db0
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), .
(doi:10.1364/JOSAB.26.001370).
Abstract
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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Published date: 1 July 2009
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Local EPrints ID: 163423
URI: http://eprints.soton.ac.uk/id/eprint/163423
ISSN: 0740-3224
PURE UUID: 7a0ac5cd-9879-4c40-b1d4-e3dddcdad54e
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Date deposited: 08 Sep 2010 12:56
Last modified: 14 Mar 2024 02:05
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Author:
Mark A. Hughes
Author:
Weijia Yang
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