Abstract
We pumped a 1m long highly nonlinear photonic crystal fiber by a Ti: sapphire laser and generated a supercontinuum with the wavelength extension form 420—1700nm，of which the output power was about 170mW and we conversion efficiency was above 20%. The experiment result was particularly analyzed and compared with calculated result，and we consider the main reasons of supercontinuum generation was fission of high-order solitons and four-wave mixing. We also researched the supercontinuum generation under different pump power and wavelength conditions. With the pump power increased gradually in the same fiber，the output spectrum can be divided into initial broadening stage，dramatic broadening stage and saturation broadening stage. When the output spectrum is in the initial broadening stage or saturation broadening stage，there exists some residual pump，when the output spectrum is in the dramatic broadening stage，the highest conversion efficiency is obtained. When the pump wavelength is in the anomalous dispersion reion of the fiber，the spectrum width is far broader than that in the zero dispersion region，but the shapes of the spectra are very similar. These conclusions provide valuable reference for supercontinuum system optimization and control.
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