ULTRAFAST OPTICAL NONLINEARITIES IN II-VI COMPOUNDS

被引:9
作者
FLUEGEL, B
JOFFRE, M
PARK, SH
MORGAN, R
HU, YZ
LINDBERG, M
KOCH, SW
HULIN, D
MIGUS, A
ANTONETTI, A
PEYGHAMBARIAN, N
机构
[1] Optical Sciences Center, University of Arizona, Tucson
基金
美国国家科学基金会;
关键词
D O I
10.1016/0022-0248(90)91052-R
中图分类号
O7 [晶体学];
学科分类号
0702 ; 070205 ; 0703 ; 080501 ;
摘要
We review our experimental and theoretical results on the femtosecond laser excited CdS and CdSe bulk and quantum dots. Optical Stark effect in bulk CdS is reported where the electron-hole continuum states in addition to the bound-exciton states are blue shifted. The nonlinear optical properties of CdSe microcrystallites embedded in glass matrices are investigated using femtosecond and nanosecond laser pulses. Spectral hole-buring is observed which is accompanied by an induced absorption feature on the high-energy side. A 25±10 fs dephasing time is obtained from these measurements. It is concluded that Coulomb effects are important in quantum dots. They give rise to a ground state two-pair resonance on the low energy side of the one-pair state and higher energy two-pair resonances which are spectrally located between the one-pair states. Single-beam saturation experiments show that the intensities required for bleaching are larger for smaller crystallites. © 1989.
引用
收藏
页码:643 / 649
页数:7
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