Peak-power limits on fiber amplifiers imposed by self-focusing

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 $\left(P_{\mathrm{crit}}\right)$. 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 $P_{\mathrm{crit}}$ in straight and bent fibers. We show that in a MM fiber amplifier seeded with its fundamental eigenmode at powers $\ll P_{\mathrm{crit}}$, the transverse spatial profile adiabatically evolves through a continuum of stationary solutions as the beam is amplified toward $P_{\mathrm{crit}}$.

© 2006 Optical Society of America