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Article

Ultrafast Third-Order Nonlinear Optical Response Excited by fs Laser Pulses at 1550 nm in GaN Crystals

1
National Institute for Laser, Plasma and Radiation Physics, 409 Atomistilor Street, 077125 Magurele, Romania
2
National Center for Materials Study and Testing, Technical University of Moldova, Stefan cel Mare av. 168, 2004 Chisinau, Moldova
3
Academy of Sciences of Moldova, Stefan cel Mare av. 1, 2001 Chisinau, Moldova
*
Authors to whom correspondence should be addressed.
Academic Editor: Fabrizio Roccaforte
Materials 2021, 14(12), 3194; https://doi.org/10.3390/ma14123194
Received: 25 April 2021 / Revised: 4 June 2021 / Accepted: 5 June 2021 / Published: 10 June 2021
(This article belongs to the Special Issue Feature Paper in Section Optics and Photonics)
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. View Full-Text
Keywords: gallium nitride crystal; third-order nonlinear susceptibility; third-harmonic generation; femtosecond laser pulses; ultrafast nonlinear optical response gallium nitride crystal; third-order nonlinear susceptibility; third-harmonic generation; femtosecond laser pulses; ultrafast nonlinear optical response
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MDPI and ACS Style

Petris, A.; Gheorghe, P.; Braniste, T.; Tiginyanu, I. Ultrafast Third-Order Nonlinear Optical Response Excited by fs Laser Pulses at 1550 nm in GaN Crystals. Materials 2021, 14, 3194. https://doi.org/10.3390/ma14123194

AMA Style

Petris A, Gheorghe P, Braniste T, Tiginyanu I. Ultrafast Third-Order Nonlinear Optical Response Excited by fs Laser Pulses at 1550 nm in GaN Crystals. Materials. 2021; 14(12):3194. https://doi.org/10.3390/ma14123194

Chicago/Turabian Style

Petris, Adrian, Petronela Gheorghe, Tudor Braniste, and Ion Tiginyanu. 2021. "Ultrafast Third-Order Nonlinear Optical Response Excited by fs Laser Pulses at 1550 nm in GaN Crystals" Materials 14, no. 12: 3194. https://doi.org/10.3390/ma14123194

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