Diffractive optical elements can be realized as ultra-thin plates that offer significantly
reduced footprint and weight compared to refractive elements. However, such elements …

Gradient-index Alvarez lenses (GALs), a new, to the best of our knowledge, type of freeform
optical component, are surveyed in this work for their unique properties in generating …

The metrology of freeform wavefront can be performed by the use of a noninterferometric
method, such as a Shack–Hartmann sensor (SHS). Detailed experimental investigations …

A pair of adjacent transmissive diffractive optical elements (DOEs) forms a combined DOE
with tunable optical properties, as, for example, a diffractive lens with an adjustable focal …

A key feature of Alvarez lenses is that they may be tuned in focal length using lateral rather
than axial translation, thus reducing the overall length of a focus-tunable optical system …

This paper gives an overview of the research carried out at TU Ilmenau towards the
development and application of tip-and laser-based nanofabrication on flat and curved …

The Alvarez lenses consist of two parts with surface geometry designed to produce a
change in refractive power with transversal translation between the upper and lower parts of …

In this work, we apply the Alvarez–Lohmann principle for varifocal lenses to diffractive off-
axis elements tuned by rotation. Two methods to combine multiple elements into arrays are …

We consider using the Alvarez lens concept to perform focal length change in conventional
optical systems. The Alvarez pair are a good example of freeform surfaces that are used to …

We have previously presented broadband variable transmission sphere (BVTS) systems
based on the Alvarez lens for use in Fizeau interferometry. A BVTS system may replace …