0000000000773138

AUTHOR

Kenshiro Nagasaka

showing 2 related works from this author

Enhanced supercontinuum generation in tapered tellurite suspended core fiber

2015

Abstract We demonstrate 400-THz (0.6–3.3 µm) bandwidth infrared supercontinuum generation in a 10 cm-long tapered tellurite suspended core fiber pumped by nJ-level 200-fs pulses from an optical parametric oscillator. The increased nonlinearity and dispersion engineering extended by the moderate reduction of the fiber core size are exploited for supercontinuum optimization on both frequency edges (i.e., 155-THz overall gain), while keeping efficient power coupling into the untapered fiber input. The remaining limitation of supercontinuum bandwidth is related to the presence of the high absorption beyond 3 µm whereas spectral broadening is expected to fully cover the glass transmission window…

Dispersion engineeringMaterials scienceInfraredbusiness.industryBandwidth (signal processing)Nonlinear opticsAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic MaterialsSupercontinuumOpticsOptical parametric oscillatorElectrical and Electronic EngineeringPhysical and Theoretical ChemistrybusinessHigh absorptionDoppler broadeningOptics Communications
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Filamentation-induced spectral broadening and pulse shortening of infrared pulses in Tellurite glass

2016

Abstract Filamentation of infrared femtosecond pulses in Tellurite glass is reported, leading to the generation of a supercontinuum generation spanning from the visible up to 4 μm. The angular distribution of the supercontinuum shows clear evidence of conical waves generation, in particular, in the visible region. Moreover, taking advantage of the spatio-temporal self-focusing effect occurring in the Tellurite glass, a twofold pulse shortening is demonstrated. Tellurite glass appears as a very convenient, versatile and promising medium for femtosecond nonlinear optics in the infrared region.

Materials scienceInfraredbusiness.industryPhysics::OpticsNonlinear opticsSelf-focusing02 engineering and technology021001 nanoscience & nanotechnology01 natural sciencesAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic MaterialsPulse (physics)Supercontinuum010309 opticsOpticsFilamentation0103 physical sciencesFemtosecondOptoelectronicsElectrical and Electronic EngineeringPhysical and Theoretical Chemistry0210 nano-technologybusinessDoppler broadeningOptics Communications
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