Supercontinuum (SC) generation in ytterbium-doped fiber amplifiers usually use single-wavelength laser seeds, which leads to the supercontinuum with strong Raman peak and unsatisfactory flatness. In this paper, a 1030 nm and 1064 nm dual-wavelength seeded ytterbium-doped fiber amplifier (YDFA) is demonstrated for the first time to generate a supercontinuum, the Raman peaks generated by 1030 nm and 1064 nm pulse lasers fill in the dips of each other, which is conducive to the flattening of the spectrum. The dual-wavelength seeded amplifier exhibits high spectral flatness with an 8 dB spectral bandwidth from 1 μm to 2 μm at the average output power of 1.92 W. The influence of the power ratio of 1030nm and 1064nm pulse laser seed and the impact of different inter-pulse time-delay of the two pulse lasers on the supercontinuum are investigated experimentally. The experimental results indicate that when the power ratio of 1030 nm and 1064 nm pulse lasers is 10:1, the flatness of supercontinuum has the best performance, which is determined by the absorption/radiation cross section of ytterbium ions, and the synchronous amplification of dual-wavelength pulsed seed lasers is more conductive to the broadening and flattening of the supercontinuum, as compared with the case of one seed laser. This work provides a new way to realize high flatness supercontinuum in YDFA.
This paper reports the experimental research of supercontinuum (SC) generation in a 1030 nm fiber amplifier for the first time. The ytterbium-doped fiber amplifier designed based on the 1030 nm seed laser is used to pump the passive fiber to obtain the SC output. In this paper, the effects of the pulse width and repetition frequency of the seed laser on the SC output power and spectral characteristics, and the influence of the passive fiber length on the SC output characteristics are experimentally researched. The experimental results show that under the condition that the peak power of the amplifier is basically the same, the output power of the SC spectrum is basically unchanged by increasing the pulse width and reducing the repetition frequency of the seed laser, but the ability of the spectrum to broaden toward the edge of the long-wavelength becomes stronger and the long-wavelength band in the spectrum has a higher proportion of the optical power. Under the conditions that pulse width and repetition frequency of the seed laser and the output power of the amplifier are constant, the longer the length of the passive fiber, the stronger the ability of the spectrum to broaden toward the edge of the long-wavelength. However, a too long passive fiber will transfer the excessive power to more than 2μm, which is not conducive to the further increase of the output power due to the introduction of more losses.
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