%0 Journal Article
%T Third-Order Nonlinear Spectrum of GaN under Femtosecond-Pulse Excitation from the Visible to the Near Infrared
%J Photonics | An Open Access Journal from MDPI
%D 2019
%R https://doi.org/10.3390/photonics6020069
%X Gallium nitride (GaN) has been established as a promising candidate for integrated electro-optic and photonic devices, aiming at applications from optical switching to signal processing. Studies of its optical nonlinearities, however, lack spectral coverage, especially in the telecommunications range. In this study, we measured the two-photon absorption coefficient (¦Â) and the nonlinear index of refraction (n 2) of GaN from the visible to the near-infrared by using femtosecond laser pulses. We observed an increase of ¦Â from (1.0 ¡À 0.2) to (2.9 ¡À 0.6) ¡Á10 £¿11 m/W as the photon energy approached the band gap from 1.77 up to 2.25 eV (700¨C550 nm), while n 2 varied from (90 ¡À 30) ¡Á10 £¿20 up to (265 ¡À 80) ¡Á10 £¿20 m 2/W within a broad spectral range, from 0.80 up to 2.25 eV (1550¨C550 nm). The results were modeled by applying a theory based on the second-order perturbation theory and the Kramers-Kronig relationship for direct-gap semiconductors, which are important for the development of GaN-based nonlinear photonic devices. View Full-Tex
%U https://www.mdpi.com/2304-6732/6/2/69