Abstract
In this work a photonic crystal fiber made of a heavy metal oxide glass with optimized dispersion profile is proposed for supercontinuum generation in a broad range of wavelengths in the near-infrared, when pumped by a mode-locked fiber-based laser. The fiber is modelled and optimal geometrical parameters are selected to achieve flat and low dispersion in the anomalous regime. Supercontinuum generation in the range of 0.76–2.40 µm, within the dynamics of 30 dB, when pumped at 1.56 µm with 400 fs–long pulses and an average power 660 mW is possible. The applicability of such fibers is also discussed.
Highlights
Interest in photonic crystal fibers (PCFs) has lasted for more than two decades since their invention in 1996 [1]
In the paper the possibility to shape the dispersion characteristics of a PCF due to a precise choice of the diameters of the air-holes in the cladding, including variable filling factor, was demonstrated in the fiber made of a heavy metal oxide glass PBG-08A
The influence of certain rows of holes surrounding the core on the dispersion characteristics was determined
Summary
Interest in photonic crystal fibers (PCFs) has lasted for more than two decades since their invention in 1996 [1]. The decrease of transmission in silica glass for longer wavelengths, caused by multi-photon absorption by Si–O bondings and vibrational resonances on OH–ions motivates the search for other materials for PCF development that would allow for transmission in mid-infrared (mid-IR) Such transmission is a property of glasses containing heavy atoms with lower excitation energy of optical phonons. The supercontinuum spectrum was generated in the range of 1.5–14 μm when a 23 cm–long fiber was pumped by a 4.5 μm laser with 150 fs–long pulses and the repetition rate frep = 1 kHz. Recently, mid-IR SG has been demonstrated in a low-loss telluride glass fiber with a double cladding. The fiber is modelled and optimal geometrical parameters are selected to achieve flat and low low chromatic dispersion in the anomalous regime for spectrally efficient, soliton-based SG.
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