Influence of an isotropic energy background on the interaction between a TEMoo laser beam and a non-conductive surface

The energy of a continuous-wave (cw-) laser beam can be stored in the vibrations of atoms located on an insulating surface when a V-system with two lasers of different power is set up and preserves the transparency window of the insulating material. Two TEMoo diode lasers of 532 nm irradiate simultaneously the same spot of width 2mm on a crown glass surface. A capacitor configuration with glass used as dielectric material located between aluminum plates can increase the energy background of atomic dipoles located on the surface, thus reducing the coupling between the two laser beams. The parallel component to the plane of incidence and the total irradiance of the probe laser beam reflected by a crown glass surface near Brewster angle (of 56.6 deg.) are measured and analyzed. An interference pattern between the two 532 nm TEM₀₀ cw-laser beams is measured in the parallel component of the reflectance at five capacitor voltages: 0, 0.3, 0.6, 3.0 and 6.0 volts. At voltage lower than 0.3 volts we observe a regular interference pattern with an angular spacing between adjacent maxima and minima of 0.6 degree. For voltages of 0.6 volts and greater, the interference pattern changes into an uneven distribution of maxima and minima, together with a strong attenuation of the reflected beam.