2-PHOTON RESONANCE IN THG OF POLYMER

被引：1
作者：
SUN, X
FU, RT
LIN, DL
GEORGE, TF
机构：
[1] CHINESE ACAD SCI, NATL LAB INFRARED PHYS, SHANGHAI, PEOPLES R CHINA
[2] SUNY Buffalo, DEPT PHYS, BUFFALO, NY 14260 USA
[3] WASHINGTON STATE UNIV, DEPT CHEM, PULLMAN, WA 99164 USA
[4] FUDAN UNIV, DEPT PHYS, SHANGHAI 200433, PEOPLES R CHINA
来源：
SYNTHETIC METALS | 1993年 / 57卷 / 01期
基金：
中国国家自然科学基金;
关键词：
2-PHOTON RESONANCE; 3RD HARMONIC GENERATION (THG); EXCITATION-DEPENDENT DAMPING;
D O I：
10.1016/0379-6779(93)90536-6
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The THG spectrum chi(3)(omega) of trans-polyacetylene has two peaks at 0.6 and 0.9eV. While the first peak is unanimously understood to originate from the three-photon resonance across the energy gap, how to interpret the second peak is a controversial issue. Both the single-particle and correlated electron theories show that the two-photon resonance can give the second peak, but its position is higher than 0.9eV. A phenomenological consideration indicates that the excitation-dependent damping shifts the second. peak to the lower energy. This paper presents a microscopic theory of the excitation-dependent damping, from which the THG spectrum chi(3)(omega) can be calculated and agrees quantitatively with the experimental data.
引用
收藏
页码：3927 / 3932
页数：6
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