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Article Laser Diode to Single-mode Fiber Excitation via Hemispherical Lens on the Fiber Tip: Efficiency Computation by ABCD Matrix with Consideration for Allowable Aperture was published on April 1, 1998 in the journal Journal of Optical Communications (volume 19, issue 2).
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Gangopadhyay et al. (1998) studied this question.
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