A tunable repetition-rate, high-order harmonic soliton is realized in a passively hybrid mode-locked all-fiber laser by using a carbon nanotube and nonlinear polarization rotation (NPR) technique. At different polarization states with appropriate pump power, the laser can operate at tunable harmonic solitons of 1st, 3rd, 7th, 11th, 17th, 22th, and 29th, corresponding to the fundamental repetition rate ranging from 18.22MHz to 528.5MHz, which was mainly caused by the NPR effect and intracavity spectral filtering effect.
We demonstrate an all-fiber broadband supercontinuum (SC) source with high efficiency in a single-mode high
nonlinear silica fiber. The SC is pumped by the 1557 nm sub-picosecond pulse, which is generated by a homemade
passively mode-locked fiber laser, amplified by an EDFA and compressed to 600 fs. The high nonlinear fiber used in
experiments has the zero-dispersion wavelength of 1584 nm with low dispersion slope. The pump pulse is in the normal
dispersion region and the SC generation is initiated by the SPM effect. When the long-wave band of the spectrum is
extended to the anomalous dispersion region, the soliton effects and intra-pulse Raman effects extend the spectrum
further. Meanwhile, the dispersive waves shorter than 1100 nm begin to emerge because the phase matching condition is
satisfied and the intensity increases with increasing the pump intensity. The broad SC spectrum with the spectral range
from 840 to 2390 nm is obtained at the pump peak power of 46.71 kW, and the 10 dB bandwidth from 1120 nm to 2245
nm of the SC covers one octave assuming the peak near 1550 nm is filtered. The temporal trace of the SC has the
repetition rate of 16.7 MHz, and some satellite pulses are generated during the nonlinear process. The SC source system
is constructed by all-fiber components, which can be fusion spliced together directly with low loss less than 0.1 dB and
improves the energy transfer efficiency from the pump source to the SC greatly. The maximum SC average power of 332
mW is obtained for the total spectral range, and the slop efficiency to the pump source is about 70.3%, which will be
lower when the peaks near 1550 nm are filtered, but is higher than those in PCFs. The spectral density for the 10 dB
bandwidth is in the range from -17.3 to -7.3 dBm/nm.
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