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Multiplex frequency conversion of unamplified 30-fs Ti: sapphire laser pulses by an array of waveguiding wires in a random-hole microstructure fiber

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Abstract

An array of fused silica waveguiding channels with randomly distributed transverse sizes in a disordered microstructure fiber is shown to allow a highly efficient broadly tunable frequency conversion of low-energy ultrashort laser pulses. Dispersion can be switched in such waveguide arrays by coupling the pump field into waveguiding wires with different diameters. Microstructure-fiber-integrated random arrays of waveguides with diameters ranging from 0.6 up to 1.5 µm can frequency-convert unamplified subnanojoule Ti: sapphire laser pulses with an initial duration of 30 fs to any wavelength within a broad spectral range from 400 up to 700 nm, suggesting interesting fiber-optic strategies for multiplex frequency conversion and sensing.

©2004 Optical Society of America

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Figures (4)

Fig. 1.
Fig. 1. Scanning electron microscope images of the random-hole microstructure fiber: (a) general view and (b) a close-up view.
Fig. 2.
Fig. 2. (a) Group-velocity dispersion as a function of the wavelength for channels 1–5 (curves 1–5, respectively) in the microstructure fiber shown in Fig. 1. Squares present experimental data. (b, c) Transverse intensity profiles for the fundamental mode of (b) the rectangular waveguide channel bounded by four air holes and (c) the triangular waveguide channel bounded by three air holes.
Fig. 3.
Fig. 3. Spectra of radiation transmitted through channels 1 (a) and 2 (b) of the random microstructure fiber with a length of 3 cm. The input pump power of Ti: sapphire laser pulses coupled into the fiber is 7 mW (curve 1), 15 mW (curve 2), and 30 mW (curve 3). (c) The spectrum of supercontinuum emission from the microstructure fiber. The pump power coupled into the fiber is 15 mW (curve 1), 30 mW (curve 2), and 60 mW (curve 3). The initial pulse duration is 30 fs.
Fig. 4.
Fig. 4. Output beam patterns of anti-Stokes-shifted emission from channels 1–6 in Fig. 1(b) (a–f) of the random microstructure fiber.
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