Ultrafast and nonlinear optical characterization of optical limiting processes in fullerenes

被引：6

作者：

Kohlman, R ^{[1
]}

Klimov, V ^{[1
]}

Grigorova, M ^{[1
]}

Shi, X ^{[1
]}

Mattes, BR ^{[1
]}

McBranch, D ^{[1
]}

Wang, H ^{[1
]}

Wudl, F ^{[1
]}

Nogues, JL ^{[1
]}

Moreshead, W ^{[1
]}

机构：

[1] Univ Calif Los Alamos Natl Lab, Chem Sci & Technol Div, Los Alamos, NM 87545 USA

来源：

FULLERENES AND PHOTONICS IV | 1997年 / 3142卷

关键词：

fullerenes; C-60; transient absorption; optical limiting; sol-gel glasses;

D O I：

10.1117/12.283754

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We present recent results of broadband femtosecond (fs) transient absorption (TA) and broadband nanosecond (ns) optical limiting (OL) studies of C-60 and derivatized C-60. Improvements in measurement techniques for fs TA spectra provide sensitivity to 10(-5) in differential transmission, allowing detailed comparison of excited-state spectra with established energy level diagrams, as well as comparison of the ratio of triplet to singlet excited-state absorption cross sections from TA spectra with those obtained by modeling time transients at different wavelengths. For derivatized fullerenes, which provide enhanced solubility and a ground-state absorption extended into the infrared compared with C-60 there is no spectral region where the triplet absorption cross section dominates the singlet as strongly as in C-60. Wavelength-dependent studies show that the OL response improves monotonically at longer wavelengths, demonstrating broadband limiting in all 6,6 mono-adducts and neat C-60. We report new approaches to processing sol-gel encapsulated fullerenes to improve the OL performance of solid-state materials to approach the response of solution limiters.

引用

页码：72 / 82

页数：11