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Hollow core photonic crystal fibers for beam delivery

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Abstract

Hollow-core photonic crystal fibers have unusual properties which make them ideally suited to delivery of laser beams. We describe the properties of fibers with different core designs, and the observed effects of anti-crossings with interface modes. We conclude that 7-unit-cell cores are currently most suitable for transmission of femtosecond and sub-picosecond pulses, whereas larger cores (e.g. 19-cell cores) are better for delivering nanosecond pulsed and continuous-wave beams.

©2004 Optical Society of America

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Supplementary Material (1)

Media 1: AVI (505 KB)     

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Figures (5)

Fig. 1.
Fig. 1. Scanning electron micrograph of the HC-PCF used in the experiments described in this paper
Fig. 2.
Fig. 2. Spectrum of a broadband light source (tungsten lamp) transmitted through a 5m length of the HC-PCF. The inset shows the attenuation recorded using a cutback measurement on 85 m of the same fiber.
Fig 3.
Fig 3. Enlarged view of the interface-mode region of the transmission curve from Fig. 2, with observed near-field intensity maps at the fiber output at wavelengths corresponding to some of the intensity mimima and maxima. The entire sequence can be viewed as a movie. (avi, 505kB)
Fig. 4.
Fig. 4. (a) Polarized near-field intensity patterns recorded using low numerical aperture excitation as a function of wavelength (log scale). (b) Near-field patterns at two different wavelengths using a higher numerical aperture excitation with the same output polarization (linear scale). One of these (1021 nm) shows interface-mode features, even though these are not apparent in the fundamental mode at this wavelength.
Fig. 5.
Fig. 5. 7-cell and 19-cell fiber structures and examples of computed guided-mode field patterns.

Tables (1)

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Table 1. Properties of 7-cell and 19-cell fibers.

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