Experimental investigation of high power picosecond 1.06 um pulse propagation in Bragg fibers

Michal Jelínek; Václav Kubeček; Helena JelÍnková; Vlastimil Matějec; Ivan Kašik; Ondřej Podrazký

doi:10.1117/12.2017214

8 May 2013 Experimental investigation of high power picosecond 1.06 μm pulse propagation in Bragg fibers

Michal Jelínek, Václav Kubeček, Helena JelÍnková, Vlastimil Matějec, Ivan Kašik, Ondřej Podrazký

Proceedings Volume 8772, Nonlinear Optics and Applications VII; 87721E (2013) https://doi.org/10.1117/12.2017214
Event: SPIE Optics + Optoelectronics, 2013, Prague, Czech Republic

Abstract

In this paper we present fabrication and characterization of the laboratory-designed Bragg fiber. The fiber consisted of a silica core with the diameter of 26 μm surrounded by 3 pairs of circular Bragg layers with a refractive index contrast up to 0.033. Spectral attenuation was measured using a halogen lamp source and the cut-back method resulting in the attenuation coefficient of 0.175 dB/m at 1064 nm. Experiments on high power laser radiation delivery were performed using a laboratory-designed passively mode-locked Nd:YAG laser system generating pulses with the duration of 20 ps and energy of 15 μJ at the wavelength of 1064 nm. The attenuation coefficient measurements resulted in a value of 0.168 ± 0.005 dB/m. The delivered beam spatial profile was detected in the far-field zone in the distance of ~1 cm from the fiber output face. The beam had a circular symmetry with almost Gaussian intensity profile. Bending losses were measured on 1-m long fiber segments using mandrels with different diameters. The bending losses were equal to zero at mandrel diameters greater than 50 mm. Decreasing the mandrel diameter, the bending losses were slightly increasing to a value of 3.6 dB/turn at the mandrel diameter of 8 mm. Stimulated Raman scattering in the fiber was also investigated. The Raman threshold intensity in the fiber core for a 1-m long fiber segment was 113 GWcm². In a 48-m long fiber, generation up to the 3^rd Stokes component was observed together with the spectral broadening up to 1650 nm.

Citation Download Citation

Michal Jelínek, Václav Kubeček, Helena JelÍnková, Vlastimil Matějec, Ivan Kašik, and Ondřej Podrazký "Experimental investigation of high power picosecond 1.06 μm pulse propagation in Bragg fibers", Proc. SPIE 8772, Nonlinear Optics and Applications VII, 87721E (8 May 2013); https://doi.org/10.1117/12.2017214

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