Design and quality evaluation of micro-optical freeform beam shapers
نویسندگان
چکیده
Progress in micro-fabrication has enabled not only diffractive optical elements (DOE) but also complex freeform surfaces [1]. Transmissive optical elements can be mainly classified into refractive and diffractive. Ray-tracing techniques are sufficient to explain light propagation through and beyond refractive elements. On the other hand, since interferences are the basis of the diffractive domain, the wave behavior of light must be contemplated in their design. When comparing the topography of elements from each domain, the refractive one is characterized by surfaces with macroscopic continuous features which are mostly insensitive to the wavelength of light. Conversely, DOEs wavelength dependence is prominent, since they are thin elements with microscopic features that modulate incident light by means of diffraction.
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