THE SATURATION LIMIT TO PICOSECOND, INDUCED ABSORPTION IN DYES

Authors
HUGHES S SPRUCE G WHERRETT BS WELFORD KR LLOYD AD
Citation
S. Hughes et al., THE SATURATION LIMIT TO PICOSECOND, INDUCED ABSORPTION IN DYES, Optics communications, 100(1-4), 1993, pp. 113-117
Citations number
10
Categorie Soggetti
Optics
Journal title
Optics communications → ACNP
ISSN journal
00304018
Volume
100
Issue
1-4
Year of publication
1993
Pages
113 - 117
Database
ISI
SICI code
0030-4018(1993)100:1-4<113:TSLTPI>2.0.ZU;2-A
Abstract
The increase in transmission coefficient at high fluences, following l ow-fluence reverse saturable absorption (induced absorption), is demon strated for the tricarbocyanine dye, HITCI. This novel effect is expla ined in terms of a modified three-level model of the singlet states. T he absorption cross-section at 532 nm of the first excited state is de termined to be 4.8 x 10(-16) cm2, 29 times that of the ground state. W e find the lifetime of the first excited state to be 1.5 ns and that o f the second excited state to be of the order of 8 ps.