Power coupling from laser diodes into single-mode fibres with quadrangular pyramid-shaped hemiellipsoidal ends

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Abstract
A novel fabrication method for hemiellipsoidal microlenses formed on fibre ends is proposed, for efficient coupling from laser diodes into single-mode fibres. The method permits the realisation of microlenses with the required ellipticities to match the fields of lasers and fibres. A very low coupling loss of 2.65 dB has been achieved.