Regular papers

Investigating the effects of laser beams (532 nm and 660 nm) in annihilation of pistachio mould fungus using spectrophotometry analysis

¹ Department of Bioelectronics, Institute of Solid State Electronics, Vienna University of Technology, Austria
² Biophotonics Laboratory, Plasma-Physics Research Center, Research and Science Campus, IAU, Tehran, Iran
³ Physics of Physiological Processes, Faculty of Physics, University of Vienna, Austria

^* saghafi@fkeserver.fke.tuwien.ac.at

Received: 31 January 2010

Abstract

When moulds are illuminated by visible electromagnetic-EM radiations, several effects on nucleus materials and nucleotides can be detected. These effects have a significant influence on mould generation or destruction. This paper presents the effects and implications of a red diode laser beam (660 nm), a second-harmonics of a Nd:YAG laser emitting green beam (532 nm), or the combination of both, on the eradication of Pistachio mould fungus. Incident doses (ID) of both beams are kept identical throughout the experiment. The absorption spectrums of irradiated mouldy samples and the bright-greenish-yellow-fluorescence (BGYF) of fungus occurring in mould texture due to electronic excitation are investigated. We found that a combination of a green and a red laser beam with an ID of 0.5 J/cm² provides the optimal effects on Pistachio mould fungus eradication.