Density patterns in metal films produced by laser interference.

Fringed periodic patterns have been produced by laser interference at 193 nm in an almost continuous 9.5 nm-thick Ag film that exhibits a number density of ≈189 μm(-2) holes. Patterns with four periods in the range of 1.

Period dependence of laser induced patterns in metal films.

Periodic fringed patterns with four periods in the range 1.8-10.2 μm have been produced in continuous Ag films that have thicknesses of 14.

Synthetic diffractive elements for security applications realized on an enhanced integral dot-matrix system.

One of the important fields of application of synthetic diffractive structures is optical document security. Several methods of security enhancement of diffractive elements for security applications are presented, namely, high carrier-frequency cryptograms and noise-covered elements are introduced. Structures are designed with respect to the fabrication on special enhanced integral dot-matrix system.

Beam steering experiment with two cascaded ferroelectric liquid-crystal spatial light modulators.

The design, construction, and evaluation of a laser beam steerer that uses two binary ferroelectric liquid-crystal (FLC) spatial light modulators (SLMs) operated in conjunction are presented. The system is characterized by having few components and is in principle lossless. Experimentally, a throughput of approximately 20% was achieved.