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23 May 2023 Simultaneous modal phase- and group velocity matching in multiple step-index highly GeO2-doped optical fibers
Artemii Tishchenko, Francis Berghmans, Tigran Baghdasaryan
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Proceedings Volume 12643, European Workshop on Optical Fibre Sensors (EWOFS 2023); 126433C (2023) https://doi.org/10.1117/12.2680578
Event: European Workshop on Optical Fibre Sensors (EWOFS 2023), 2023, Mons, Belgium
Abstract
Optical fibers are often used as a medium for nonlinear optical processes, especially for frequency doubling or second harmonic generation (SHG). Obtaining efficient SHG requires phase matching, which is challenging to achieve with ultrashort laser pulses. For that purpose we study how specific optical fiber designs can facilitate said phase matching. In this report we show that multi-step index fibers, which can be considered as an approximation of graded index fibers, can provide for simultaneous modal phase matching (MPM) and group velocity matching (GVM). That leads to an efficient pulsed second harmonic generation in optical fiber, which will open new opportunities for fiber sensing domain as well, where bio-sensing, medical sensing and strain sensing can be in the target.
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Artemii Tishchenko, Francis Berghmans, and Tigran Baghdasaryan "Simultaneous modal phase- and group velocity matching in multiple step-index highly GeO2-doped optical fibers", Proc. SPIE 12643, European Workshop on Optical Fibre Sensors (EWOFS 2023), 126433C (23 May 2023); https://doi.org/10.1117/12.2680578
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KEYWORDS
Optical fibers
Second harmonic generation
Step index fibers
Phase matching
Phase velocity
Ultrafast phenomena
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