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Compact multi-Watt picosecond coherent white light sources using multiple-taper fibers

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Abstract

The combination of a diode-pumped Nd:YVO4 picosecond laser source with tapered fibers allows the realization of a compact white light source with an average output power of up to 5.65 W. We generated supercontinua with a throughput of ~50% over a spectral range of up to 1140 nm by using a series of tapered fibers that were spliced together.

©2005 Optical Society of America

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Figures (6)

Fig. 1.
Fig. 1. Experimental set-up. We used two different diode-pumped, Nd:YVO4 laser sources in front of the tapered fiber. Input coupling was accomplished using a 0.3 NA microscope objective. The spectrometer was an ANDO AQ 6315A.
Fig. 2.
Fig. 2. (a) Output spectrum of a tapered fiber as a function of input power of laser A. The waist diameter was 3.3 µm and the waist length was 90 mm. (b) shows calculated group velocity dispersion (GVD) curves for 2.0 µm, 3.0 µm, 3.3 µm, and 3.8 µm. Positive values correspond to anomalous dispersion. The zero dispersion wavelengths are located at 715 nm, 835 nm, 865 nm, and 905 nm, respectively.
Fig. 3.
Fig. 3. Output spectrum of a “double taper” as a function of input power using laser A. The average waist diameters were 2.9 µm and 2.5 µm, and the waist lengths were 90 mm each.
Fig. 4.
Fig. 4. Output spectrum of a “triple taper” made of three tapers of 3.0 µm average waist diameter and 90 mm waist length each as a function of input power of laser A.
Fig. 5.
Fig. 5. Output spectra behind laser B as a function of the number of tapered fibers spliced together. The diameters are given in the figure, and the waist lengths are 90 mm each.
Fig. 6.
Fig. 6. Output spectra of three triple tapers with a similar diameter in comparison to a mixed configuration of three fibers. Each single tapered fiber has a waist length of 90 mm. The pump source was laser B.
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