Abstract
A universal model capable of handling various operating conditions has
been developed for designing of high power single frequency fiber amplifiers.
The model analyzes the impacts of pump configurations, fiber lengths, and
fiber temperatures on amplifier performance. It shows that counter-pumped
amplifiers are capable of generating several times more output than co-pumped
amplifiers. To fully take their advantages and deliver the laser output, a
delivery fiber should be properly designed to avoid unwanted SBS which can
significantly undermine the amplifier performance. On the other hand, for
applications requiring delivery fiber at relative low power, the co-pumped
amplifier can be an alternative since it can use the gain fiber as the delivery
fiber and thus eliminate requiring an additional delivery fiber. The model
also analyzes possible approaches for suppressing SBS, such as applying additional
heating, the use of SBS suppressing fiber, and increasing core diameter. It
shows that applying additional heating to a co-pumped amplifier can increase
the output by a factor of 1.7. Finally, the model concludes that a single
frequency amplifier can achieve multiple kilowatts output by carefully choosing
amplifier design and utilizing SBS suppression technique.
© 2009 IEEE
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