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Near 100% efficient fibre microlenses

Near 100% efficient fibre microlenses

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Microlenses have been fabricated directly on the ends of optical fibres which demonstrate 90% (−0.45 dB) coupling efficiencies to semiconductor lasers. The lenses are made by laser micromachining a spinning fibre in a microlathe arrangement. Theoretically, it is possible to collect nearly 100% of the laser radiation with the aspheric lens design presented.

References

    1. 1)
      • R. Kingslake . (1978) , Lens design fundamentals.
    2. 2)
      • G. Wenke , Y. Zhu . Comparison of efficiency and feedback characteristics of techniques for coupling semiconductor lasers to single-mode fibre. Appl. Opt. , 23 , 3873 - 3844
    3. 3)
      • H. Kuwahara , M. Sasaki , N. Tokoyo . Efficient coupling from semiconductor lasers into single-mode fibres with tapered hemispherical ends. Appl. Opt. , 15 , 2578 - 2583
    4. 4)
      • H.M. Presby , A.F. Benner , C.A. Edwards . Laser micro-machining of efficient fibre microlenses. Appl. Opt. , 18 , 2692 - 2695
    5. 5)
      • H. Ghafoori-Shiraz , T. Asano . Microlens for coupling a semiconductor laser to a single-mode fibre. Opt. Lett. , 8 , 537 - 539
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