A dual-wavelength narrow-linewidth laser system, with ultranarrow wavelength spacing, is proposed and demonstrated. The operation principle of the laser system is based on the pump-induced thermal effects of the Er-Yb-doped fiber distributed Bragg reflector (DBR) laser. We designed and constructed a common Er-Yb-doped DBR fiber laser with proper parameters. With the pump power of the DBR laser increasing, the Bragg wavelengths and the bandwidths of the two gratings will change unequally. When the laser is pumped with 45 mW, we obtain stable dual-wavelength lasing with a 3-dB bandwidth of 0.014 nm and a wavelength spacing of 0.055 nm.
A dual-wavelength narrow line width laser system, with ultra-narrow wavelength spacing, is proposed and demonstrated.
The operation principle of the laser system is based on the pumped-induced thermal effects of the Er-Yb-doped fiber
DBR laser. We designed and constructed a common Er-Yb-doped DBR fiber laser with proper parameters. With the
pump power of the DBR laser increasing, the Bragg wavelengths and the bandwidths of the two gratings will change
unequally. When pumped with 45mW, we obtain a stable dual wavelength lasing with the bandwidth of 0.014nm and the
wavelength spacing of 0.055nm.
Self similar mode locked fiber laser is studied based on a numerical model. By introducing a dimensionless factor k to
characterize the pulse, the self similar pulse formation and its temporal and spectral changes are investigated throughout
the cavity. The influences of all the elements inside the cavity on the pulse formation are also studied.
In an intermediate asymptotic propagation distance, pulse's self similar evolution is influenced by the initial pulse width
and chirp, as a result pulses can not completely evolve into a parabolic pulse, which can affect the compression of the
evolved pulse. The self similar evolution results of ultra-short pulse with different width and initial chirp coefficient are
studied by numerical simulation. The study shows the wider the pulse is, the worse the self similar evolution and
compression are; it also shows the initial chirp can greatly hold out the self similar evolution and compression, the larger
the chirp and the wider the pulse, the worse the self similar evolution, and the influence of the positive chirp on the
evolution is bigger than that of negative chirp.
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