| Issue |
EPJ Web Conf.
Volume 335, 2025
EOS Annual Meeting (EOSAM 2025)
|
|
|---|---|---|
| Article Number | 06002 | |
| Number of page(s) | 2 | |
| Section | Topical Meeting - Nonlinear and Quantum Optics | |
| DOI | https://doi.org/10.1051/epjconf/202533506002 | |
| Published online | 22 September 2025 | |
https://doi.org/10.1051/epjconf/202533506002
Factors limiting second harmonic generation efficiency in optically poled fibers
1 Dipartimento di Ingegneria dell’Informazione, Università di Brescia, via Branze 38, 25123 Brescia, Italy
2 Université de Limoges, XLIM, UMR CNRS 7252, 123 Av. A. Thomas, 87060 Limoges, France
Published online: 22 September 2025
Abstract
We investigated the efficiency limitations of second-harmonic generation (SHG) in spliced optically poled Corning HI980 fiber segments. Although theory predicts quadratic growth with segment number, experiments show nearly linear efficiency scaling. Using a continuous wave model (CW), we demonstrate this subquadratic behavior primarily stems from random longitudinal shifts between quasi-phase-matching (QPM) regions in spliced segments. Further investigations through coupled generalized nonlinear Schrödinger equations (coupled GNLSEs) confirm fundamental frequency (FF) power depletion through Raman scattering and spectral broadening during propagation. Our numerical simulations successfully reproduced experimental spectral measurements, validating the model's accuracy. For the first time, we report the effective quadratic nonlinear coefficient induced by optical poling in this fiber: deff = 9× 10−4 pm/V.
© The Authors, published by EDP Sciences, 2025
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