We present a linear cavity type of Erbium-Doped fiber oscillator designed for high stability femtosecond pulse production. Commercial Semiconductor Saturable Absorber Mirrors (SESAM) is applied. To avoid environment unstable effects which affects on polarization state of fiber, standard faraday rotator is used in this cavity. Also the experimental study of ring femtosecond fiber laser is compared with linear once. The linear cavity is more stable than ring configuration. With addition of Erbium-Doped fiber amplifier, the output power 100mW with 910 fs and 45.5 MHz repetition rate is acquired without any pulse compressing.
By considering propagation equations of Stokes-waves for the Stimulated Brillouin Scattering (SBS) and the Stimulated Raman Scattering (SRS) together with propagation-rate equations of Ytterbium-doped double-clad fiber amplifiers, we numerically solve set of coupled partial differential equations and investigate dynamic characteristics of these amplifiers such as the temporal pulse energy, power, upper-level population distribution, amplified spontaneous emission, stored energy, pulse waveform evolution and the threshold of inelastic scatterings in different regimes of the temporal pulse width, input pulse peak power, input pulse bandwidth and repetition rates. Based on our analysis we establish some criteria for the threshold of inelastic scatterings according to characteristics of the input pulse and amplifying regime. Also for the first time, to the best of our knowledge, we discuss effect of the input pulse shape on the threshold of inelastic scatterings and importance of using pulse shaping methods.
By considering propagation equations of Stokes-waves for different orders of the stimulated Brillouin scattering (SBS) and the stimulated Raman scattering (SRS) together with propagation-rate equations of Ytterbium-doped double-clad fiber amplifiers, we numerically analyze steady-state characteristics of these amplifiers such as Amplified Spontaneous Emission (ASE) and threshold pump power and parameters which have influence over it such as pumping configuration, pumping wavelength, input signal wavelength, input signal power, input signal bandwidth and amplifier geometry. Also in an experimental setup threshold pump powers under both forward and backward pumping configurations are measured. Our results are of prime importance for applications such as nonlinear frequency generation.
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