EFFECT OF HIGH-ENERGY ION IRRADIATION ON ELECTRICAL AND OPTICAL-PROPERTIES OF ORGANIC NONLINEAR-OPTICAL CRYSTALS

Two new organic nonlinear single crystals viz., Methyl hydroxy benzoat e (MHB) a nd p-hydroxy Acetophenone (HAP) are irradiated with swift he avy ions Ag 100 MeV and Si 50-100 MeV, from the 15 UD pelletron at NSC Delhi. Hydrogen depth profiling was carried out by using ERDA techniq ue. The effect of irradiation on the dielectric, nonlinear optical pro perties have been investigated A dramatic increase in the value of the dielectric constant was observed in both MHB and HAP. The dielectric constants increased by 10-13 times. The refractive index values were a lso increased. However the second harmonic generation efficiency of th ese crystals were only marginally affected. (C) 1998 Elsevier Science Ltd. All rights reserved.