Accession Number:

ADA347827

Title:

DURIP97 Instrumentation for Characterization of Two-Photon Absorbing Organic Materials

Descriptive Note:

Final technical rept. 1 Apr 97-31 Mar 98

Corporate Author:

CALIFORNIA INST OF TECHNOLOGY PASADENABECKMAN INST

Personal Author(s):

Report Date:

1998-06-05

Pagination or Media Count:

11.0

Abstract:

DURIP funds were used to purchase a Spex Model FL112 High Performance Research Grade Fluorimeter and a NdYAG-pumped nanosecond Optical Parametric Oscillator Laser System with tunability from 440 nm - 1800 nm. This equipment was used to measure the two-photon absorption spectra for a variety of molecules from different classes and identify promising candidate molecules to meet DoD requirements for a variety of applications. A strategy for the design of molecules with large two-photon absorption cross sections has been developed. The strategy is based on the concept that symmetric charge transfer, from the ends of a conjugated system to the middle, or vice versa, upon excitation is correlated to enhanced two-photon absorption cross sections. It was shown that newly synthesized bis-styrylbenzene derivatives with donor-acceptor-donor, and acceptor-donor-acceptor structural motifs exhibit exceptionally large two-photon absorption cross sections, up to roughly 400 times that of trans-stilbene.

Subject Categories:

  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE