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Novel and improved methods of writing Bragg gratings with phase masks

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2 Author(s)
Othonos, Andreas ; The Ontario Laser & Lightwave Res. Centre, Toronto Univ., Ont., Canada ; Lee, Xavier

The authors demonstrate the importance of spatial coherence of the writing beam for inscribing Bragg gratings with a phase mask. Bragg gratings were written using a normal excimer laser with the fiber placed at various distances away from the phase mask. This was repeated with an excimer laser that was modified to improve the beam spatial coherence showing dramatic improvement in the ability to inscribe gratings. Tunability of the inscribed Bragg grating wavelength, utilizing a single phase mask in conjunction with the improved spatial coherence of the excitation source, is demonstrated.<>

Published in:

Photonics Technology Letters, IEEE  (Volume:7 ,  Issue: 10 )

Date of Publication:

Oct. 1995

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