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