Fiber-optic delivery of femtosecond laser pulses permits the development of miniaturized, flexible two-photon microscopes. A major obstacle has been pulse-broadening caused by fiber dispersion and non-linearities. Here we utilize a novel hollow-core photonic crystal fiber for undistorted transmission of high-energy femtosecond pulses at 810-nm center wavelength from a Ti:sapphire laser.

© 2004 Optical Society of America

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