We demonstrate propagation of femtosecond pulses in the 800-nm range through a hollow-core photonic crystal fiber with preserved temporal and spectral profiles for pulse energies up to 4.6 nJ. Without the use of a prechirping unit, 170-fs pulses were transmitted essentially undistorted at 812 nm, near the zero-dispersion wavelength. Because of the air guidance of pulses, intensity-dependent nonlinear effects were minimal, with only 15% pulse broadening occurring at 350-mW average output power. This fiber thus is excellently suited for applications that require single-mode delivery of high-energy ultrashort pulses to the fiber output face such as, for example, miniaturized multiphoton microscopes.
© 2004 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
(060.7140) Fiber optics and optical communications : Ultrafast processes in fibers
(320.5550) Ultrafast optics : Pulses
(320.7140) Ultrafast optics : Ultrafast processes in fibers
Werner Göbel, Axel Nimmerjahn, and Fritjof Helmchen, "Distortion-free delivery of nanojoule femtosecond pulses from a Ti:sapphire laser through a hollow-core photonic crystal fiber," Opt. Lett. 29, 1285-1287 (2004)