Multiple-beam interference patterns in optical fiber generated with ultrafast pulses and a phase mask
- 1 July 2004
- journal article
- Published by Optica Publishing Group in Optics Letters
- Vol. 29 (13) , 1458-1460
- https://doi.org/10.1364/ol.29.001458
Abstract
We compare the cladding patterns present in grating structures fabricated with an ultrafast laser and a phase mask with a cw beam interference model. We find that the observed patterns agree well with the model results for picosecond pulses; however, for femtosecond pulses, we show that the full bandwidth and the pulsed nature of the sources must be considered because the pattern can be affected by group-velocity walk-off. An interesting consequence of order walk-off is the possibility of pure two-beam interference generation with a phase mask in the femtosecond pulse regime.Keywords
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