Abstract
Excited-state absorptive and refractive nonlinearities of a ZnPcBr4/DMSO solution are studied using a modified picosecond time-resolved pump-probe system based on a 4f nonlinear imaging technique with phase object. With the help of additional nanosecond laser Z-scan measurements, the parameters associated with the five-level model used to interpret the experimental results are uniquely determined. Unusually large absorption cross sections for the first singlet excited state and for the lowest triplet excited state as well as a rather short intersystem crossing time are found in this system, suggesting ZnPcBr4 (a phthalocyanine) to be an effective optical limiter. The intensity-dependent refractive index of neat dimethyl sulfoxide (DMSO) and the excited-state contribution to the nonlinear refractive index of the solution are also determined.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
