Nanoimprinting and tapering of chalcogenide photonic crystal fibers for cascaded supercontinuum generation

Christian R Petersen (1) , Mikkel B Lotz (1) , Getinet Woyessa (1) , Amar Nath Ghosh (2) , Thibaut Sylvestre (2) , L Brilland (3) , Johann Troles (4) , Mogens H Jakobsen (1) , Rafael Taboryski (1) , O Bang (1)

1 DTU - Danmarks Tekniske Universitet = Technical University of Denmark
2 FEMTO-ST - Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174)
3 SelenOptics - SelenOptics [Bruz]
4 ISCR - Institut des Sciences Chimiques de Rennes

Improved long-wavelength transmission and supercontinuum (SC) generation is demonstrated by antireflective (AR) nanoimprinting and tapering of chalcogenide photonic crystal fibers (PCFs). Using a SC source input spanning from 1 to 4.2 μm, the total transmission of a 15 μm core diameter PCF was improved from ∼53% to ∼74% by nanoimprinting of AR structures on both input and output facets of the fiber. Through a combined effect of reduced reflection and redshifting of the spectrum to 5 μm, the relative transmission of light >3.5  μm in the same fiber was increased by 60.2%. Further extension of the spectrum to 8 μm was achieved using tapered fibers. The spectral broadening dynamics and output power were investigated using different taper parameters and pulse repetition rates.

Domaines: Optique [physics.optics]

Christian R Petersen, Mikkel B Lotz, Getinet Woyessa, Amar Nath Ghosh, Thibaut Sylvestre, et al.. Nanoimprinting and tapering of chalcogenide photonic crystal fibers for cascaded supercontinuum generation. Optics Letters, 2019, 44 (22), pp.5505 - 5508. ⟨10.1364/OL.44.005505⟩. ⟨hal-02366638⟩