High power supercontinuum generation in a nonlinear ytterbium-doped fiber amplifier.

College of Optoelectronic Science and Engineering, National University of Defense Technology, Chang Sha, China.
Optics Letters (Impact Factor: 3.18). 05/2012; 37(9):1529-31. DOI: 10.1364/OL.37.001529
Source: PubMed

ABSTRACT High power supercontinuum generation with 70 W average output power in a nonlinear ytterbium-doped fiber amplifier is demonstrated using all-normal dispersion, all-fiber master oscillator power amplifier configuration. The supercontinuum covers from 1064 nm to beyond 1700 nm with spectral flatness better than 12 dB and 67.3% optical to optical conversion efficiency. The almost uniform spectral power density across the whole continuum is more than 70 mW/nm and the nanosecond bursts output have an effective peak power of 82.7 kW.

  • [Show abstract] [Hide abstract]
    ABSTRACT: Photonic crystal fiber has been widely used in visible and near-infrared supercontinuum generation due to its flexible dispersion control and high nonlinearity. However, the maximum average output power of supercontinuum from a photonic crystal fiber has not exceed one hundred watt owing to the small core diameter of the photonic crystal fiber and the low coupling efficiency between the pump and the photonic crystal fiber. Recently, supercontinuum generation directly from a nonlinear fiber amplifier attracts lots of attention as a result of its simple structure and low splicing loss and many excellent results have been achieved either in low and high average power, which is proved to be a promising method to realize kilowatt level high power near-infrared supercontinuum. However, the numerical study on high power near-infrared supercontinuum generation from a nonlinear fiber amplifier has been rarely reported, so there is great necessity to carry out some theoretical study on it. In this paper the complex Ginzburg-Landau equation is used to describe the formation and propagation of high power near-infrared supercontinuum generation in a nonlinear fiber amplifier. The chromatic dispersion of the ytterbium-doped fiber is measured by a Mach-Zehnder interferometer. The roles of the small signal gain, input pulse width and initial chirp of the input pulse played on the continuum formation are analyzed in detail. The results are in good agreement with the experiments which can provide some theoretical guidance on future optimization of the flatness and width of the supercontinuum generation from a nonlinear fiber amplifier.
    ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging; 09/2013
  • [Show abstract] [Hide abstract]
    ABSTRACT: We report high power mid-infrared (mid-IR) supercontinuum (SC) generation in a single-mode ZBLAN (ZrF4-BaF2-LaF3-AlF3-NaF) fiber with up to 21.8 W average output power from 1.9 to beyond 3.8 μm pumped by amplified picosecond pulses from a single-mode thulium-doped fiber (TDF) master oscillator power amplifier (MOPA). The optical-optical conversion efficiency from the 793 nm pump laser of the last stage thulium-doped fiber amplifier (TDFA) to mid-IR SC output is 17%. It is, to the best of our knowledge, the highest average power mid-IR SC generation from a ZBLAN fiber to date.
    Optics Express 10/2014; 22(20). DOI:10.1364/OE.22.024384 · 3.53 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: We demonstrated a high-power wavelength-tunable picosecond Yb-doped fiber master oscillator power amplifier source without any tunable elements for the first time. This wavelength-tunable output was realized based on the birefringence-induced filter effect of the nonlinear polarization rotation mode-locked fiber laser, which worked as the seed source. Through cascaded single-mode Yb-doped fiber preamplifiers together with two double-cladding Yb-doped fiber amplifiers, the pulses were amplified up to 21.2-W output power in the wavelength range from 1038.4 to 1060 nm with a pulse duration of 9.5 ps, an optical signal-to-noise ratio of 25 dB, and a beam quality ${rm M}^{2}$ of 1.16 at the repetition rate of 178 MHz.
    IEEE Photonics Journal 10/2014; 6(5):1-6. DOI:10.1109/JPHOT.2014.2356511 · 2.33 Impact Factor