PHOTOINDUCED DICHROISM AND BIREFRINGENCE IN FILMS OF MORDANT PURE YELLOW POLY(VINYL ALCOHOL) - SIMULTANEOUS REAL-TIME INVESTIGATIONS AT 2 WAVELENGTHS

Authors
IVANOV M NIKOLOVA L TODOROV T TOMOVA N DRAGOSTINOVA V
Citation
M. Ivanov et al., PHOTOINDUCED DICHROISM AND BIREFRINGENCE IN FILMS OF MORDANT PURE YELLOW POLY(VINYL ALCOHOL) - SIMULTANEOUS REAL-TIME INVESTIGATIONS AT 2 WAVELENGTHS, Optical and quantum electronics, 26(11), 1994, pp. 1013-1018
Citations number
17
Categorie Soggetti
Optics,"Engineering, Eletrical & Electronic
Journal title
Optical and quantum electronics → ACNP
ISSN journal
03068919
Volume
26
Issue
11
Year of publication
1994
Pages
1013 - 1018
Database
ISI
SICI code
0306-8919(1994)26:11<1013:PDABIF>2.0.ZU;2-6
Abstract
Photoinduced anisotropy in films of azo-dye Mordant Pure Yellow (MPY) dissolved in a polyvinyl alcohol matrix, is investigated. The photodic hroism and photoinduced birefringence are measured in real time for tw o wavelengths, 488 nm (in the absorption band) and 633 nm (outside it) , on excitation with an Ar+ laser beam. It is shown that strong dichro ism is induced without changing the average optical density of the fil m, and the kinetic curves of the birefringence and the dichroism are s ubstantially different. The conclusion is made that the photoprocesses of the dye molecules cause a reconstruction of the matrix.