Title :
Femtosecond coherent and incoherent spectroscopies on GaN
Author :
Jho, Y.D. ; Kim, D.S. ; Fischer, A.J. ; Song, J.J. ; Kenrow, J. ; El Sayed, K. ; Stanton, C.J.
Author_Institution :
Dept. of Phys., Seoul Nat. Univ., South Korea
Abstract :
We have performed pump-probe (P-P) simultaneously with time-integrated-FWM as a function of the energy of excitation and the excitation intensity. This shows that the tendency of the quantum beats, as revealed in the previous study, are the same both in P-P and FWM but the change of trace in the negative delays in P-P is markedly different from that in FWM. The P-P signals both at below-gap excitation and at the low intensity excitation show another oscillatory behavior distinct from the A-B exciton beats.
Keywords :
III-V semiconductors; excitons; gallium compounds; multiwave mixing; polarons; quantum beat spectra; time resolved spectra; wide band gap semiconductors; GaN; below-gap excitation; excitation energy; excitation intensity; exciton beats; femtosecond coherent spectroscopy; femtosecond incoherent spectroscopy; low intensity excitation; oscillatory behavior; polariton speed; pump-probe technique; quantum beats; time delay; time-integrated-FWM; Delay effects; Excitons; Gallium nitride; Laser excitation; Laser theory; Physics; Polarization; Reflectivity; Resonance; Spectroscopy;
Conference_Titel :
Lasers and Electro-Optics, 1999. CLEO/Pacific Rim '99. The Pacific Rim Conference on
Print_ISBN :
0-7803-5661-6
DOI :
10.1109/CLEOPR.1999.811502
