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20 June 2024 Frequency comb in optically poled multimode graded-index fibers
Yago Arosa, Maxime Jonard, Tigran Mansuryan, Maggy Colas, Julie Cornette, Jean-René Duclère, Claire Lefort, Alessandro Tonello, Vincent Couderc
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Proceedings Volume PC13004, Nonlinear Optics and its Applications 2024; PC130040K (2024) https://doi.org/10.1117/12.3016649
Event: SPIE Photonics Europe, 2024, Strasbourg, France
Abstract
We investigate an original approach for the generation of unequally spaced frequency combs using (2) –(3) nonlinearities in multimode graded-index (MM-GRIN) fiber. In a preliminary step, the MM-GRIN fiber (50 µm of core diameter and 125 μm of cladding diameter) is optically poled with a Nd:YAG sub-nanosecond microchip laser at 1064 nm. As a results, a double periodical inscription of a complex second order non-linearity χ(2) grating was led. The resulting χ(2) inscription allows the generation of second harmonic wave (SH) from a supercontinuum obtained in the infrared domain under the Raman and soliton propagation actions. We then detect the generation of various irregularly spaced spectral peaks surrounding the original SH (532 nm) at the fiber output allowing harmonic generation on more than 100 nm in the visible domain.
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Yago Arosa, Maxime Jonard, Tigran Mansuryan, Maggy Colas, Julie Cornette, Jean-René Duclère, Claire Lefort, Alessandro Tonello, and Vincent Couderc "Frequency comb in optically poled multimode graded-index fibers", Proc. SPIE PC13004, Nonlinear Optics and its Applications 2024, PC130040K (20 June 2024); https://doi.org/10.1117/12.3016649
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KEYWORDS
Multimode fibers
Frequency combs
Graded index fibers
Beam diameter
Harmonic generation
Phase matching
Second harmonic generation
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