Karl Guttag compared the optics of diffractive waveguides against the competing technology, reflective waveguides. An optical lattice can be created using diffractive optics and optical elements. There are two technologies used in augmented reality&colon; diffractive waveguides and reflective waveguides. An alternative to achromatic doublets is the use of diffractive optical elements. It is typically formed by diffractive optical elements from a Gaussian beam. OVDs are based on diffractive optical structures. OSLO has the capability of modeling a wide range of reflective, refractive and diffractive components. The multilayers serve as a diffractive grating for the incident light. The detector aims at measurement of total cross section, elastic scattering, and diffractive processes. A special staircase process, called binary optics, is used to fabricate diffractive components. Some examples of such systems include coherent diffractive imaging, coded-aperture imaging and image super-resolution. There is definite quantal transfer of translative momentum between particle and diffractive object. For a diffractive seismic event, the specularity can be sub-unitary. RCWA is also used to improve diffractive structures for high efficiency solar cells. For example, forward instrumentation for diffractive physics has been added far down the HERA tunnel.