30 May 2016 Theoretical study on the interference pattern of femtosecond pulses diffracted by a phase mask
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Proceedings Volume 9916, Sixth European Workshop on Optical Fibre Sensors; 991627 (2016) https://doi.org/10.1117/12.2236902
Event: Sixth European Workshop on Optical Fibre Sensors (EWOFS'2016), 2016, Limerick, Ireland
Abstract
In this paper, we describe a theoretical study on the interference created by a phase mask when a femtosecond laser is used. The limitations of the phase mask-to-fiber distance are discussed and the optimal inscription range is established. Femtosecond lasers have the unique feature of short coherence length and thus the diffraction orders do not interfere after a certain distance travelled from the phase mask even if the phase mask has a poor zero order suppression. The equation describing this behaviour is presented and simulations are included for validation. The intensity profile of the overlapping ±1 diffraction orders after the phase mask is also studied for 1st order (1070 nm pitch) and for 2nd order (2140 nm pitch) phase masks.
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A. Bueno, A. Bueno, D. Kinet, D. Kinet, K. Chah, K. Chah, P. Mégret, P. Mégret, C. Caucheteur, C. Caucheteur, } "Theoretical study on the interference pattern of femtosecond pulses diffracted by a phase mask", Proc. SPIE 9916, Sixth European Workshop on Optical Fibre Sensors, 991627 (30 May 2016); doi: 10.1117/12.2236902; https://doi.org/10.1117/12.2236902
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