Journal
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
Volume 26, Issue 7, Pages 1370-1378Publisher
OPTICAL SOC AMER
DOI: 10.1364/JOSAB.26.001370
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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. (C) 2009 Optical Society of America
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