Design of freeform phase diffractive optical elements based on the quadratic assignment problem.

The design of freeform phase diffractive optical elements is a challenging task, typically necessitating the use of complex differential equations or a large number of iterative calculations. This paper proposes what we believe to be a novel approach to address this problem. In this strategy, we introduce overall comparison optimization (OCO) to ensure the fast convergence of the cost function.

Wave front control with SLM and simulation of light wave diffraction.

With the development of microfabrication technology, it has become possible to modulate the optical wavefront with high accuracy by a device such as a liquid crystal spatial light modulator (SLM). In this study, we conducted a theoretical analysis and experimental study on the generation of Laguerre Gaussian beam of vortex light wave using phase modulation SLM. Numerical simulation and experimental results on the generation of Laguerre Gaussian beam by both binary and phase only modulation are discussed based on the angular spectrum method and the Fresnel transformation method in hologram (CGH) diffraction.

Collimating lens for light-emitting-diode light source based on non-imaging optics.

A collimating lens for a light-emitting-diode (LED) light source is an essential device widely used in lighting engineering. Lens surfaces are calculated by geometrical optics and nonimaging optics. This design progress does not rely on any software optimization and any complex iterative process.