Experimental and theoretical study of stable negative index gratings formed at 193 nm

Dong, Liang, Liu, W.F. and Reekie, Laurence (1997) Experimental and theoretical study of stable negative index gratings formed at 193 nm In Photosensitive Optical Materials and Devices. The International Society for Optical Engineering.. (doi:10.1117/12.264201).


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We have demonstrated fast formation (~1500 pulses at ~1 J/cm). These gratings were found to be far more stable than the gratings with positive index modulations formed at the early stage of the grating growth. We have also found that the maximum negative index modulations achieved do not depend on the pulse intensifies, although the inverse of the time taken to reach the negative index modulation maximum varies linearly with the pulse intensities. This prompts us to use a three energy level system to model the photosensitivity in the boron-doped germanosilicate fibre. All the necessary parameters of the model can be determined from a single growth measurement of the average index change and the model's prediction fits well the measured index modulation growth. A complex grating decay process is also observed at elevated temperatures as predicted by the three energy level model. The thermal stability of both positive and negative index gratings in a Boron-co-doped germanosilicate fibre is characterised at fixed temperatures, so that the stability of such grating can be accessed for any writing fluence

Item Type: Conference or Workshop Item (Paper)
Digital Object Identifier (DOI): doi:10.1117/12.264201
Venue - Dates: Photosensitive Optical Materials and Devices (SPIE Photonics West '97), United States, 1997-02-01
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ePrint ID: 76806
Date :
Date Event
February 1997Published
Date Deposited: 11 Mar 2010
Last Modified: 18 Apr 2017 20:37
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/76806

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