Title :
Effects of near-infrared laser and superluminous diode irradiation on Escherichia coli division rate
Author :
Karu, Tiina ; Tiphlova, Olga ; Samokhina, Margarita ; Diamantopoulos, Costas ; Sarantsev, Vyatcheslav P. ; Shveikin, Vassili
Author_Institution :
Laser Technol. Center, Acad. of Sci., Troitsk, USSR
fDate :
12/1/1990 12:00:00 AM
Abstract :
An investigation is conducted of the effect of a 1300-nm continuous-wave (CW) laser diode 950-nm modulated superluminous diode which had a fixed average power density of 1.2×103 W/m 2 at all variable repetition rates of 2, 26, 700, 1000, and 5000 Hz and had an equivalent pulse duration of 410, 31.1, 1.15, 0.82, and 0.16 ms, respectively. The effect of both diodes on the rate of Escherichia coli WP2 division was examined. It was found that the radiation of the CW mode of the 1300-nm laser diode increased the division of E. coli in the dose range of 0.9-9.0 J/cm2. The 950-nm pulsed irradiation increased or inhibited the division rate of bacteria depending on the pulsing frequency and/or pulse duration
Keywords :
biological effects of laser radiation; cellular effects of radiation; 1300 nm; 950 nm; Escherichia coli division rate; average power density; bacteria; continuous wave diode laser; equivalent pulse duration; modulated superluminous diode; pulsed irradiation; pulsing frequency; repetition rates; superluminous diode irradiation; Biological system modeling; Diode lasers; Frequency; Laser modes; Laser theory; Microorganisms; Optical pulses; Pulse modulation; Semiconductor diodes; Semiconductor lasers;
Journal_Title :
Quantum Electronics, IEEE Journal of
