Abstract

We demonstrate propagation of 14nJ femtosecond pulses through a large-mode-area, higher-order-mode (HOM) fiber with an effective area of 2100μm2. The pulses propagate stably in the LP07 mode of the fiber through lengths as long as 12m. The strongly chirped pulses exiting the amplifier fiber are dechirped by the high-order-mode fiber, resulting in pulses with a peak power of 61kW after propagation in 5m 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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