Broadband IR supercontinuum generation in hexagonal lattice tellurite photonic crystal fiber with dispersion optimized for pumping over 1500 nm

Mariusz Klimczak; Grzegorz Stępniewski; Henry Bookey; Dariusz Pysz; Andrew Waddie; Ryszard Stępień; Ajoy Kar; Mohammad R. Taghizadeh; Ryszard Buczyński

doi:10.1117/12.2039979

20 February 2014 Broadband IR supercontinuum generation in hexagonal lattice tellurite photonic crystal fiber with dispersion optimized for pumping over 1500 nm

Mariusz Klimczak, Grzegorz Stępniewski, Henry Bookey, Dariusz Pysz, Andrew Waddie, Ryszard Stępień, Ajoy Kar, Mohammad R. Taghizadeh, Ryszard Buczyński

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Proceedings Volume 8964, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XIII; 89640V (2014) https://doi.org/10.1117/12.2039979
Event: SPIE LASE, 2014, San Francisco, California, United States

Abstract

Tellurite glass photonic crystal fibers (PCF) offer a large potential for broadband supercontinuum generation with bandwidths of 4000 nm demonstrated in suspended-core tellurite PCFs under pumping at 1500-1600 nm. We fabricated a hexagonal-lattice, tellurite PCF with lattice constant Λ = 2 μm, linear filling factor d/Λ=0.75 μm, and a solid core with 2.7 μm diameter. Dispersion, calculated from SEM image of drawn fiber, has ZDW at 1500 nm and 4350 nm with a maximum of 193 ps/nm/km at 2900 nm. Under pumping with 150 fs / 36 nJ / 1580 nm pulses, supercontinuum in a bandwidth from 800 nm to over 2500 nm was measured in a 2 cm long PCF sample. Measured coupling efficiency was 8%. Dispersive and nonlinear length scales are 52 cm and 0.2 mm respectively, yielding nonlinearity-dominant propagation regime in the fiber. Numerical analysis of measured supercontinuum spectrum using NLSE, enabled identification of soliton fission and their subsequent red-shifting, dispersive wave generation across first ZDW, as well as FWM among the red-shifted spectral components. FWM phase-matching condition in the fiber is satisfied in a broad range from 1500 nm to 4000 nm with roughly 900 nm bandwidth around the signal wavelength. Developed model is in good agreement with experimental results. Model is used to estimate supercontinuum bandwidth for other experimental conditions with pump pulse lengths up to 1 ps and PCF lengths up to 10 cm.

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Mariusz Klimczak, Grzegorz Stępniewski, Henry Bookey, Dariusz Pysz, Andrew Waddie, Ryszard Stępień, Ajoy Kar, Mohammad R. Taghizadeh, and Ryszard Buczyński "Broadband IR supercontinuum generation in hexagonal lattice tellurite photonic crystal fiber with dispersion optimized for pumping over 1500 nm", Proc. SPIE 8964, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XIII, 89640V (20 February 2014); https://doi.org/10.1117/12.2039979

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KEYWORDS

Solitons

Glasses

Supercontinuum generation

Dispersion

Signal attenuation

Photonic crystal fibers

Fiber lasers

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