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Micro Fresnel Zone Plate Lens Inscribed on a Hard Polymer Clad Fiber Using Femtosecond Pulsed Laser

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7 Author(s)
Jongki Kim ; Department of Physics, Yonsei University, Seoul, Korea ; Woosung Ha ; Jiyoung Park ; Jun Ki Kim
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We report a novel process to directly inscribe a Fresnel zone plate (FZP) lens on the cleaved facet of a hard clad polymer fiber using a femtosecond pulsed laser. The FZPs are designed by adopting modal analysis and free-space diffraction, which are experimentally implemented by locally ablating silica glass using femtosecond laser pulses. A good agreement between the design and fabricated FZP lens is obtained with an exceptionally long focal length over 600 m, which can have a strong potential in all-fiber beam shaping technology and optical interconnections.

Published in:

IEEE Photonics Technology Letters  (Volume:25 ,  Issue: 8 )