Temperature dependent nonlinear coefficients and second harmonic generation in quaternary glass system doped with TiO2

The paper reports the effect of poling temperature (120 degrees C to 200 degrees C in the step of 40 degrees C for 1 hour) on the second order nonlinear coefficient for quaternary glass (54.04 P2O5 -30.02 Bi2O3-7.38 ZnO-8.55 K2O) doped with X percentage of TiO2 (X = 0.05, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.8 and 1) determined by Maker's fringe patterns. Corresponding coherent second harmonic generation (SHG) in the forward direction is also studied. A 400 dc voltage was applied for the glass samples of thickness 1mm at the poling temperature. It is observed that the coherent SHG intensity increases with increase in TiO2 percentage, reaches maximum at 0.4% TiO2 and decreases for further increase in TiO2. SHG intensity increases with the increase in poling temperature. It is observed that value of cl-coefficients (d(31) and d(36)) change with the poling temperature.