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

• Published in: IEEE photonics technology letters Vol. 25; no. 8; pp. 761 - 763
• Main Authors: Kim, Jongki, Ha, Woosung, Park, Jiyoung, Kim, Jun Ki, Sohn, Ik-Bu, Shin, Woojin, Oh, Kyunghwan
• Format: Journal Article
• Language: English
• Published: IEEE 15-04-2013
• Subjects: Beam shaping; Fiber lasers; Fresnel zone plate; laser ablation; Laser beams; lensed fiber; Lenses; Measurement by laser beam; Optical fiber devices; Optical fibers; Ultrafast optics
• ISSN: 1041-1135; 1941-0174
• DOI: 10.1109/LPT.2013.2249506

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.