Title :
Dynamic characteristics of double-clad fiber amplifiers for high-power pulse amplification
Author :
Wang, Yong ; Po, Hong
Author_Institution :
Lasersharp Corp., Hopkinton, MA, USA
Abstract :
Based on numerical modeling, the dynamic characteristics of high-power ytterbium-doped double-clad fiber amplifiers during the amplification of nanosecond pulses with kilohertz repetition rates are comprehensively analyzed. The temporal pulse energy, power, upper-level population distribution, amplified spontaneous emission, stored energy, pulse waveform evolution, etc., are emphasized in this paper. Some practical issues in amplification processes, such as the impacts of reflected pulses from the external surfaces and the fluctuation of input pulse energy on the amplifier performance, are also discussed. The models and results are important for the design and development of high-power double-clad fiber amplifiers.
Keywords :
nonlinear optics; optical fibre amplifiers; optical fibre cladding; optical pulse generation; optical pumping; partial differential equations; superradiance; ytterbium; amplified spontaneous emission; double-clad fiber amplifiers; dynamic characteristics; high-power Yb-doped double-clad fiber amplifiers; high-power pulse amplification; input pulse energy fluctuation; kilohertz repetition rates; nanosecond pulse amplification; nonlinear effects; numerical modeling; optical pulse amplifiers; partial differential equations; pulse waveform evolution; reflected pulses; stored energy; temporal pulse energy; upper-level population distribution; Fiber lasers; Fluctuations; High power amplifiers; Numerical models; Optical amplifiers; Optical fiber amplifiers; Optical fibers; Optical pulses; Oscillators; Pulse amplifiers;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2003.818166
