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The transmission characteristics of the wide-aperture optical fiber taper (OFT) have been determined experimentally under diffuse and parallel light excitation. Power transmission efficiency versus the normalized radius of the excited input aperture of the OFT has been obtained in both cases. The OFT forms a specific output intensity distribution provided that a uniform excitation of all the OFT modes is ensured. Power transmission efficiency of more than 50% can be obtained at an appropriate normalized radius of the incident laser beam. The wide-aperture OFT is, independent of or within the cavity-taper output laser (CTOL) concept, a suitable element for launching power laser emission into optical fibers.>
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Koprinkov et al. (1992) studied this question.
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