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Spectral broadening in femtosecond laser written waveguides in chalcogenide glass

Hughes, MA, Yang, W and Hewak, DW 2009, 'Spectral broadening in femtosecond laser written waveguides in chalcogenide glass' , Journal of the Optical Society of America B: Optical Physics (JOSA B), 26 (7) , pp. 1370-1378.

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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.

Item Type: Article
Schools: Schools > School of Computing, Science and Engineering
Journal or Publication Title: Journal of the Optical Society of America B: Optical Physics (JOSA B)
Publisher: Optical Society of America
ISSN: 0740-3224
Related URLs:
Funders: Engineering and Physical Sciences Research Council (EPSRC)
Depositing User: Dr Mark Hughes
Date Deposited: 10 Nov 2015 16:38
Last Modified: 05 Apr 2016 19:37
URI: http://usir.salford.ac.uk/id/eprint/37008

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