Nonlinear optical effects in amorphous-like SiCON films

We have found that IR bicolor coherent poling of the SiCON films with the pulsed IR 200 ps laser pulses causes sufficiently high values of the second-order optical susceptibilities. The dependence of the second-order susceptibility versus the fundamental power density as well as versus the time of the optical poling and writing/fundamental beam ratios indicate on substantial role of the N/C ratio. Maximally achieved value of the second-order optical susceptibility was equal to about 9 pm/V. In the case of our films we have shown that optimal incident angle of the writing beam with respect to the sample's surface for the achievement of optimal grating is equal to about 67 degrees. Optimal ratio between the fundamental and writing beams was equal about 30. The grating is destroyed during the 10 min after the interruption of optical treatment. (c) 2005 Elsevier B.V. All rights reserved.