Browsing by Author "Kao, FJ"

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Observation of second harmonic emission and three-photon fluorescence from Gallium-Nitride
(2000)
Lee, CK
;
Kao, FJ
;
Wang, SC
;
Pan, CL
;
光電工程學系
In this study, optical emission from the undoped GaN epilayer sample was characterized using confocal micro-spectroscopy. A femtosecond laser was used to excite the sample. As the laser wavelength tuned from 762-796nm, the sample emitted a corresponding second harmonic signal from 381-398nm with a quadratic power dependence. A strong signal at 367nm resulted from a three-photon process with cubic power dependence was simultaneously observed for the first time.
Simultaneous observation of second-harmonic emission and three-photon excited photoluminescence from hybrid vapor phase epitaxy-grown GaN film
(2001-12-01)
Lee, CK
;
Kao, FJ
;
Wang, SC
;
Pan, CL
;
光電工程學系
Nonlinear optical properties of the undoped hybrid vapor phase epitaxy-grown (GaTN film sample) were investigated and analyzed using a tunable femtosecond laser as an excitation source. As the laser wavelength was tuned from 762-796 nm, the sample emitted signals corresponding to the second-harmonic wavelength from 381-398 nm with a quadratic power dependence. A strong three-photon-process-related signal at 367 nm with cubic power dependence was simultaneously observed for the first time.