Accession Number : ADA310728
Title : Two-Photon Induced Fluorescence and Lasing of Microdroplets.
Descriptive Note : Final rept.,
Corporate Author : ARMY RESEARCH LAB WHITE SANDS MISSILE RANGE NM
Personal Author(s) : Gillespie, James B. ; Chang, Richard K. ; Kwok, Alfred S.
PDF Url : ADA310728
Report Date : AUG 1995
Pagination or Media Count : 49
Abstract : The feasibility of using two photon induced fluorescence of amino acids is examined for its potential as a detection technique for biological aerosols. The research was motivated by the problem of spectral discrimination encountered in fluorescence applications. Two separate experiments were performed: (1) two-photon induced fluorescence of the three aromatic amino acids and (2) two-photon pumped lasing in spherical droplets doped with rhodomine 6g dye. It was found in the first experiment that there is greater specificity for two-photon fluorescence than for one-photon induced fluorescence; however, the effect is very weak. The lasing experiment indicated that lasing is intense, but there can only be a short distance from the source to the droplet.
Descriptors : *TWO PHOTON ABSORPTION, *BIOLOGICAL AGENT DETECTORS, DETECTION, FLUORESCENCE, EMISSION SPECTRA, DROPS, AROMATIC COMPOUNDS, DISCRIMINATION, BIOLOGICAL AEROSOLS, AMINO ACIDS, OPTICAL PUMPING.
Subject Categories : Optical Detection and Detectors
Chemical, Biological and Radiological Warfare
Distribution Statement : APPROVED FOR PUBLIC RELEASE