Abstract
We demonstrate a broadband second-harmonic generator for the green spectral range based on a periodical polarity GaN waveguide structure. We grew the structure with a periodicity of 4 \(\mu \)m using an MOCVD (metal-organic chemical vapor deposition) reactor. We tested the structure using femtosecond laser pulse pumping and obtained the second harmonic (\(\lambda _{SH}\)=512 nm) conversion efficiency 0.79\(\cdot \)10\(^{-7}\) %\(\cdot \)W\(^{-1}\) for the pump peak power of 440 kW inside the waveguide. Based on the theoretical modeling of the dispersion curves of the pump and the second harmonic, we found multiple crossings, including an extended crossing. We relate this fact to the experimentally measured broadened second harmonic spectrum.
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Acknowledgements
This research was funded by the European Regional Development Fund according to the supported activity“Research Projects Implemented by World-class Researcher Groups”under Measure No. 01.2.2-LMT-K-718 (Project code 01.2.2-LMT-K-718-01-0018).
Funding
This research was funded by the European Regional Development Fund according to the supported activity“Research Projects Implemented by World-class Researcher Groups”under Measure No. 01.2.2-LMT-K-718 (Project code 01.2.2-LMT-K-718-01-0018). A.V. and V.V. did not receive funding.
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MK, AV, IR investigated; DK performed formal analysis, wrote the original draft and edited; TG performed structure fabrication; AK performed growth; VV investigated and wrote the original draft: RP conceptualized, performed formal analysis, wrote the original draft and edited; RT conceptualized, investigated, wrote the original draft, edited and supervised.
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Kolenda, M., Kezys, D., Grinys, T. et al. Green second-harmonic generation in a periodically poled planar GaN waveguide. Opt Quant Electron 56, 778 (2024). https://doi.org/10.1007/s11082-024-06506-4
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DOI: https://doi.org/10.1007/s11082-024-06506-4