Title :
Observation of both second-harmonic and multiphoton-absorption-induced luminescence in ZnO
Author :
Dai, D.C. ; Xu, S.J. ; Shi, S.L. ; Xie, M.H. ; Che, C.M.
Author_Institution :
Dept. of Phys., Durham Univ., UK
fDate :
7/1/2006 12:00:00 AM
Abstract :
The confusion over second-harmonic generation (SHG) and multiphoton-absorption (MPA)-induced luminescence in ZnO is observed under excitation with femtosecond laser between 800 and 1000 nm at room temperature. Excitation power dependence measurements show SHG is a two-photon process, and MPA is a three- or four-photon process. These are confirmed with interferometric pulse autocorrelation experiments. Excitation power density is a main regulatory factor for this confusion.
Keywords :
II-VI semiconductors; high-speed optical techniques; light interferometry; multiphoton processes; optical harmonic generation; optical materials; photoexcitation; photoluminescence; wide band gap semiconductors; zinc compounds; 800 to 1000 nm; ZnO; excitation power density; interferometric pulse autocorrelation; luminescence; multiphoton-absorption; second-harmonic generation; two-photon process; Absorption; Autocorrelation; Laser excitation; Luminescence; Optical materials; Photonic band gap; Power measurement; Temperature; Ultrafast optics; Zinc oxide; Interferometric autocorrelation; luminescence; multiphoton absorption (MPA); second-harmonic generation (SHG); zinc oxide (ZnO);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2006.877620
