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Optical and Quantum Electronics

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01-04-2023

Elaboration and optimization of microlens for high optical coupling efficiency

Authors: Mohamed Loghrab, Nabil Belkhir, Djamed Bouzid, Assia Guessoum

Published in: Optical and Quantum Electronics | Issue 4/2023

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Abstract

Dip coating technique has the potential to provide a simpler and more cost-effective means of forming an optical fiber microcollimator composed of parabolic Polymethyl methacrylate microlenses for various applications. The effects of dip-coating operating parameters such as withdrawal speed on the thickness of a microlens were investigated in this work. Zemax® software was used to validate the analytical results and to assess the efficiency of the optical coupling. The obtained waist and working distance values, make possible the optimization of the optical coupling between a microcollimator and a laser beam, as well as between a microcollimator and an optical fiber. The simulation results of the coupling between the microcollimator and the laser beam show that the optical coupling efficiency η is about 99% with an optimal microlens radius R = 19.14 μm, a waist size W₁ = 2.49 μm and a working distance Z_w= 41.78 μm. However, the optimal microlens for the coupling between the microcollimator and the optical fiber has a minimum curvature radius about 28.78 μm. We believe that these results are of a big interest in many applications in optical experiments and laser-optical fibers applications.

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Title: Elaboration and optimization of microlens for high optical coupling efficiency
Authors: Mohamed Loghrab
Nabil Belkhir
Djamed Bouzid
Assia Guessoum
Publication date: 01-04-2023
Publisher: Springer US
Published in: Optical and Quantum Electronics / Issue 4/2023
Print ISSN: 0306-8919
Electronic ISSN: 1572-817X
DOI: https://doi.org/10.1007/s11082-023-04582-6

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