Theoretical study on the interference pattern of femtosecond pulses diffracted by a phase mask

A. Bueno; D. Kinet; K. Chah; P. Mégret; C. Caucheteur

doi:10.1117/12.2236902

30 May 2016 Theoretical study on the interference pattern of femtosecond pulses diffracted by a phase mask

A. Bueno, D. Kinet, K. Chah, P. Mégret, C. Caucheteur

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.

Citation Download Citation

A. Bueno, D. Kinet, K. Chah, P. Mégret, and 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); https://doi.org/10.1117/12.2236902

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