Broadband and continuous wave pumped second-harmonic generation from microfiber coated with layered GaSe crystal

https://phys.org/news/2023-06-broadband-second-harmonic-generation-microfiber-coated.html

"integrating long-range ordered layered gallium selenide crystals into microfibers... flame brushing illimeter-level uniform tapered region sufficiently long nonlinear interaction length... nonlinear susceptibility  gallium selenide >170 pm/V... controlling diameter microfiber, modulating waveguide dispersion, phase matching between pump and second-harmonic modes... pumping 1,550 nm picosecond laser, nw 2nd harmonic achieved... superluminescent light-emitting diode 79.3 nm, broad second-harmonic bandwidth 28.3 nm"

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