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Fabrication of micro fresnel zone plate lens on a mode-expanded hybrid optical fiber using a femtosecond laser ablation system

: Kim, J.K.; Kim, J.; Oh, K.; Sohn, I.B.; Shin, W.; Choi, H.Y.; Lee, B.


IEEE Photonics Technology Letters 21 (2009), No.1, pp.21-23
ISSN: 1041-1135
Journal Article
Fraunhofer IOF ()

We present a compact all-fiber zone plate lens directly ablated on the surface of a mode-expanded hybrid fiber end by using a high precision femtosecond laser processing technique. To achieve a sufficiently large beam size and focusing efficiency, a segment of a coreless silica fiber having a 200-mu m diameter was adapted. Focusing properties of the zone plate lens were experimentally investigated and compared with numerical simulations.