Negative index gratings formed by a 193nm excimer laser


Dong, L., Liu, W.F. and Reekie, L. (1996) Negative index gratings formed by a 193nm excimer laser. Optics Letters, 21, (24), 2032-2034. (doi:10.1364/OL.21.002032).

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Description/Abstract

We have demonstrated fast formation (~1500 pulses at ~1 J/cm^2/pulse) of fibre gratings with high negative index modulations (~-3�10^-4). 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 intensities, 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.

Item Type: Article
ISSNs: 0146-9592 (print)
1539-4794 (electronic)
Related URLs:
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Q Science > QC Physics
Divisions: University Structure - Pre August 2011 > Optoelectronics Research Centre
ePrint ID: 78054
Date Deposited: 11 Mar 2010
Last Modified: 27 Mar 2014 18:58
URI: http://eprints.soton.ac.uk/id/eprint/78054

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