We propose a supercontinuum spectral shaping method that uses the characteristics of a hollow core antiresonance fiber to appropriately attenuate the light of the pump wavelength with a high power density in the supercontinuum spectra, making the spectra flat in a certain wavelength range. In our simulation, the power intensity at the pump wavelength of the supercontinuum pumped by 1064 nm was reduced by 17 dB. In our experiment, a 10-cm-long hollow core anti-resonance fiber was used to reduce the intensity of the pump wavelength of the supercontinuum by 9 dB.
We report a supercontinuum of high polarization extinction ratio (PER) generated from a birefringent photonic crystal fiber (PCF). The zero dispersion wavelength of the fiber is calculated to be around 1.06μm. The pump source is a linear polarized femtosecond ytterbium-doped fiber laser. The SC performance with the pump pulse linear polarized both along the fast and slow axis of the PCF is studied. The SC ranging from 470nm to 2040nm has an all-spectral PER of -15.5dB, and the corresponding maximum output power is ~1W.
With all-normal-dispersion fibers, highly coherent supercontinuum (SC) can be obtained, which has several applications. Traditional air-hole photonic crystal fibers encountered some limitations for such light emission. In this study, all solid composite fibers with a silica glass cladding and a yttria-alumino-silicate glass core were fabricated, which were designed for flat coherent SCs. We achieved a flat normal dispersion in this composite fiber. Flat SCs were experimentally demonstrated with different pump conditions. The simulated SC spectra coincided well with the experimental results. It also indicated that a coherent SC with more than one octave can be obtained with higher input power.
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