%0 Journal Article
%T Laser induced phenomena in ¦Ã-glycine crystals
%A Artur Wojciechowski
%A Naser Alzayed
%A Iwan Kityk
%A Janusz Berdowski
%J Optica Applicata
%D 2010
%I 
%X The photoinduced changes of absorption within the spectral range 200¨C800 nm and optical second harmonic generation caused by illumination by the cw second harmonic generation of  the Nd:YAG laser (¦Ë = 532 nm) and power about 400 mW were investigated. We have established that increasing the time of illumination by the second harmonic generation of the Nd:YAG laser leads to the occurrence of one strong spectral minimum at 319 nm and another less strong at 420 nm. Increasing the time of illumination leads to a slight red spectral shift of the photoinduced minima. The absence of a substantial increase in temperature indicates that the principal role is played here by the photooccupation of the trapping levels. The effect is observed in a wide spectral range of the incident photoinduced angles, however, the beam should possess a good Gaussian-like form and to be space homogenous. The results were reproduced with precision up to 3¨C4% which was achieved due to additional stabilization of the photoinduced laser power by double control of the power.
%K optical absorption
%K organic crystals
%U http://www.if.pwr.wroc.pl/~optappl/pdf/2010/no4/optappl_4004p1007.pdf