Molecular photonics of a highly nonlinear organic fiber core liquid for picosecond-nanosecond optical limiting application

Citation
Ic. Khoo et al., Molecular photonics of a highly nonlinear organic fiber core liquid for picosecond-nanosecond optical limiting application, CHEM PHYS, 245(1-3), 1999, pp. 517-531
Citations number
23
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
CHEMICAL PHYSICS
ISSN journal
03010104 → ACNP
Volume
245
Issue
1-3
Year of publication
1999
Pages
517 - 531
Database
ISI
SICI code
0301-0104(19990701)245:1-3<517:MPOAHN>2.0.ZU;2-G
Abstract
Recently obtained results of optical limiting studies with picosecond and n anosecond laser pulses in a nonlinear organic fiber core liquid L34 are ana lyzed with a model that accounts for linear, two-photon, intermediate, and excited-state absorptions. Explicit expressions for the laser induced molec ular level density changes, and the nonlinear transmission and optical limi ting of picosecond laser pulses are obtained. These theoretical considerati ons and experimental results enable us to characterize the limiting effecti veness of L34 and several nonlinear fiber core liquids. In particular, the roles played by two-photon, intermediate and excited-state absorptions of p icosecond and nanosecond laser pulse pulses through ILC cored fibers and bu lk films are thoroughly examined. In the nanosecond time scale, significant contributions from thermal/density effects are detected. Together with new insights into the complex intensity-dependent nonlinear transmission in th e liquid fiber cores, we have also demonstrated the feasibility of using su ch fiber arrays for limiting picosecond and nanosecond laser pulses to belo w the eye/sensor damage level. (C) 1999 Elsevier Science B.V. All rights re served.