We demonstrate propagation of $14\mathrm{nJ}$ femtosecond pulses through a large-mode-area, higher-order-mode (HOM) fiber with an effective area of $2100\mu {\mathrm{m}}^2$ . The pulses propagate stably in the ${\mathrm{LP}}_{07}$ mode of the fiber through lengths as long as $12\mathrm{m}$ . The strongly chirped pulses exiting the amplifier fiber are dechirped by the high-order-mode fiber, resulting in pulses with a peak power of $61\mathrm{kW}$ after propagation in $5\mathrm{m}$ of the positive-dispersion fiber. A small amount of self-phase modulation is observed in the compressed pulses and is described well by a nonlinear Schrödinger equation model that takes into account the measured effective area and dispersion of the HOM fiber.

© 2006 Optical Society of America

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