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- W4385655981 abstract "Frequency conversion and, more specifically, second harmonic generation, is a fundamental phenomenon in nonlinear optics, both for applications and fundamental research. The occurring of this last effect in crystals requires that the frequency-doubled propagating beam interferes constructively with the pump itself, a phase-matching (PM) condition which is due to momentum-conservation laws. These lead to wavelength-dependent constraints on the process geometry while the wavevector mismatch is accompanied by chromatic walk-off. Conversely, collinear PM in SHG can be obtained either through optical birefringence, which introduces wavelength and polarization constraints, and quasi-phase-matching, that requires periodic material microstructuring. We present the experimental demonstration of SHG with a spectral acceptance of more than 100 nm angular and acceptance up to ±40°, with no polarization selectivity or chromatic walk-off. This is achieved in a disordered potassium-based perovskite manifesting giant broadband refraction (GR), which determines a natural and unconditioned PM with no chromatic walk-off. Results open the way to highly efficient versatile and adaptable nonlinear optical devices." @default.
- W4385655981 created "2023-08-09" @default.
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- W4385655981 date "2023-07-02" @default.
- W4385655981 modified "2023-09-27" @default.
- W4385655981 title "Second harmonic generation with giant angular and spectral acceptance" @default.
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- W4385655981 doi "https://doi.org/10.1109/icton59386.2023.10207286" @default.
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