Over the last 20 years, thin and lightweight optical elements have become very desirable,
especially for the terahertz (THz) range. Reduction of the volume of optical elements …

Diffractive optical elements (DOEs) represent a revolutionary advancement in modern
optics, offering unparalleled versatility and efficiency in various applications. Their …

Novosibirsk Free Electron Laser—Facility Description and Recent Experiments Page 1 This
article has been accepted for inclusion in a future issue of this journal. Content is final as …

A 3D printer was used to realize custom-made diffractive THz lenses. After testing several
materials, phase binary lenses with periodic and aperiodic radial profiles were designed …

In this paper, we have performed experimental, analytical, and numerical studies of beams
with topological charges of±1 and±2 formed by silicon binary phase axicons (BPAs) with …

This paper presents the results of 15 years of studies in the field of terahertz holography at
the Novosibirsk free electron laser. They cover two areas: research on obtaining holographic …

Scientists and laymen alike have always been fascinated by the ability of lenses and mirrors
to control light. Now, with the advent of metamaterials and their two-dimensional counterpart …

Coherent terahertz beams with radial polarization of the 1st, 2nd, and 3rd orders have been
generated with the use of silicon subwavelength diffractive optical elements (DOEs). Silicon …

This paper presents experimental results on the formation of given laser modes from an
illuminating Gaussian beam of the terahertz Novosibirsk free electron laser at a wavelength …

Multilevel diffractive lenses (MDLs) has undergone considerable advancements, marked by
their exceptional efficiency and diverse focusing capabilities, resulting in their widespread …