Asymmetric Light Diffraction from Nonsinusoidal Ultrasonic Surface Waves

Abstract

The diffraction pattern produced by reflection of monochromatic light from an ultrasonic surface wave composed of a fundamental and higher harmonic frequencies is calculated for a Gaussian and a uniform light surface illumination. The diffraction pattern is found to be asymmetric with respect to the central order. This asymmetry is calculated from available diffraction data on LiNb0 3 .

Polarizationally Non-sensitive Pseudo-holographic Computer Reconstruction of Random Rough Surface

“…The assumption that only the first diffraction orders from each diffraction grating contribute to the scattered field is based on the symmetry of the diffraction pattern to the left and to the right relative to the central peak [1] . In the case of the diffraction pattern asymmetry obtained from higher orders, the theory developed in [7] should be used .…”

Plasma Cleaning and Etching Using Quartz Bell Jar with SnO2 Transparent Thin-Film Heater in CHF3–SiO2 Mocrowave Etching System

“…An asymmetry of the diffraction field to the left and to the right relative to the central peak (the mirror reflected field) is observed when the amplitudes of separate gratings are big enough. This asymmetry is a result of interference of the diffraction orders in this direction [9].…”

Computer Reconstruction of a Random Rough Surface in the Presence of Higher Diffraction Orders

“…In the case of multiple scattering the symmetry of the diffraction pattern to the left and to the right relative to the central peak is broken . Therefore, the light intensity in the direction of the + 1st and -1st diffraction orders are different [3] . The degree of asymmetry increases in the presence of higher diffraction orders .…”