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Yeast flocculation (Saccharomyces cerevisiae) is one of the most important problems in fuel ethanol production. Yeast flocculation causes operational difficulties and increase in the ethanol cost. Proteolytic enzymes can solve this problem since it does not depend on these changes. The recycling of soluble papain and the immobilization of this enzyme on… (More)
This paper presents a study about output bandwidth maximization in Erbium-doped fiber lasers, by using thin films incorporating Carbon Nanotubes (CNT) with diameters of 0.8 and 1.0 nm, with several films transmittance values and different total cavity dispersion. Best result was achieved with 1.0 nm CNT generating a maximum bandwidth of 5.7 nm when films… (More)
We present a study of pulse generation and propagation in erbium-doped fiber lasers with cavity length varying from 8 m to 3.5 km. We demonstrate that soliton effect determines the pulse stabilization in ultralong cavities, measuring pulses with an average 7.0 ps pulsewidth for cavity lengths between 2.25 and 3.5 km. We also demonstrate that, by filling… (More)
In this paper we report the pulse evolution of a simultaneously mode-locked Erbium-doped fiber laser at 1556-nm-band and 1533-nm-band. We explain the dual wavelength laser operation by means of net gain cross section variations caused by the population inversion rate dependence on the pump power. At 1556-nm-band, we observed pulse duration of 370 fs with… (More)
In this paper we present a 58 kHz fundamental repetition rate 3.5 km long EDFL mode-locked by SWCNT saturable absorbers. Because laser nonlinearities and accumulated dispersion, we observed chirped soliton-like 6.79 ps pulses with 0.49 nm spectral width. This is the lowest repetition rate in EDFL, to the best of our knowledge.