We investigate femtosecond-pulse propagation through large-core microstructured fibers. Although these fibers are highly multimode, excitation of the fundamental mode is readily achieved, and coupling to higher-order modes is weak even when the fiber is bent or twisted. For prechirped input pulses with energies as large as 3 nJ, pulses as short as 140 fs were produced at the output of the fiber. Such a system could prove to be extremely useful for applications such as in vivo multiphoton microscopy and endoscopy that require delivery of femtosecond pulses and collection of fluorescence.
© 2002 Optical Society of America
(060.2300) Fiber optics and optical communications : Fiber measurements
(060.5530) Fiber optics and optical communications : Pulse propagation and temporal solitons
(320.5550) Ultrafast optics : Pulses
(320.7100) Ultrafast optics : Ultrafast measurements
D. G. Ouzounov, K. D. Moll, M. A. Foster, W. R. Zipfel, W. W. Webb, and Alexander L. Gaeta, "Delivery of nanojoule femtosecond pulses through large-core microstructured fibers," Opt. Lett. 27, 1513-1515 (2002)