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SM ISO690:2012 PETRIS, Adrian, GHEORGHE, Petronela, BRANISTE, Tudor, TIGINYANU, Ion. Ultrafast third-order nonlinear optical response excited by fs laser pulses at 1550 nm in gan crystals. In: Materials, 2021, vol. 14, pp. 1-11. ISSN 1996-1944. DOI: https://doi.org/10.3390/ma14123194 |
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Materials | |||||||
Volumul 14 / 2021 / ISSN 1996-1944 | |||||||
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DOI:https://doi.org/10.3390/ma14123194 | |||||||
CZU: 535.33:530.182+538.9+621.38 | |||||||
Pag. 1-11 | |||||||
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The ultrafast third-order optical nonlinearity of c-plane GaN crystal, excited by ultrashort (fs) high-repetition-rate laser pulses at 1550 nm, wavelength important for optical communications, is investigated for the first time by optical third-harmonic generation in non-phase-matching conditions. As the thermo-optic effect that can arise in the sample by cumulative thermal effects induced by high-repetition-rate laser pulses cannot be responsible for the third-harmonic generation, the ultrafast nonlinear optical effect of solely electronic origin is the only one involved in this process. The third-order nonlinear optical susceptibility of GaN crystal responsible for the third-harmonic generation process, an important indicative parameter for the potential use of this material in ultrafast photonic functionalities, is determined. |
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Cuvinte-cheie Femtosecond laser pulses, Gallium nitride crystal, Third-harmonic generation, Third-order nonlinear susceptibility, Ultrafast nonlinear optical response |
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