Peak-power limits on fiber amplifiers imposed by self-focusing |
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Authors: | Farrow Roger L Kliner Dahv A V Hadley G Ronald Smith Arlee V |
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Institution: | Sandia Laboratories, Livermore, CA 94551, USA. farrow@sandia.gov |
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Abstract: | We have numerically investigated the behavior of the fundamental mode of a step-index, multimode (MM) fiber as the optical power approaches the self-focusing limit (P(crit)). The analysis includes the effects of gain and bending (applicable to coiled fiber amplifiers). We find power-dependent, stationary solutions that propagate essentially without change at beam powers approaching P(crit) in straight and bent fibers. We show that in a MM fiber amplifier seeded with its fundamental eigenmode at powers
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