Investigation of the Pancharatnam-Berry phase element for the generation of the top-hat beam

2021 ◽  
Author(s):  
Pavel Gotovski ◽  
Paulius Šlevas ◽  
Sergej Orlov ◽  
Orestas Ulčinas ◽  
Vytautas Jukna ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Experimental Verification ◽  
Berry Phase ◽  
Incident Beam ◽  
Beam Width ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Optical Elements ◽  
High Power Femtosecond Laser ◽  
Phase Encode

Abstract Within optics, the Pancharatnam-Berry phase enables the design and creation of various flat special optical elements such as top-hat converters. We present a study on engineering efficient vectorial top-hat converters inscribed in glass by high-power femtosecond laser pulses. We phase-encode a top-hat converter and demonstrate how its quality is influenced by various parameters. We investigate theoretically the generation of the top-hat beam under imperfect conditions such as the mismatch of the incident beam width or the misalignment of the center of the converter. Experimental verification of the concept is also presented.

scholarly journals Формирование и оптические свойства нанорешеток на поверхности фторида кальция, генерируемых при фемтосекундном лазерном воздействии

2021 ◽  
Vol 129 (8) ◽  
pp. 1074
Author(s):  
А.Е. Рупасов ◽  
П.А. Данилов ◽  
А.А. Ионин ◽  
Н.А. Смирнов ◽  
С.И. Кудряшов ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Calcium Fluoride ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Visible Range ◽  
Urgent Problem ◽  
Optical Elements ◽  
Laser Structuring ◽  
Direct Laser ◽  
Simulation Results

Femtosecond laser structuring of dielectrics is an urgent problem for the creation of optical elements. In this work, we performed femtosecond laser nanostructuring of the calcium fluoride surface with the formation of self-organizing periodic gratings with subwavelength periods of the order of 200 and 350 nm. During the work, the dependence of the period of the structures on the wavelength of laser radiation was established, which was confirmed by the simulation results. The structures show a decrease in transmission over the entire visible range, predominantly due to diffraction and light scattering. Keywords: direct laser recording, femtosecond laser pulses, surface functional nano- and micro-optical structures, diffraction.

Two-stage nonlinear compression of high-power femtosecond laser pulses

2020 ◽  
Vol 50 (4) ◽  
pp. 331-334
Author(s):  
V N Ginzburg ◽  
I V Yakovlev ◽  
A S Zuev ◽  
A P Korobeynikova ◽  
A A Kochetkov ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
High Power ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Two Stage ◽  
High Power Femtosecond Laser ◽  
Nonlinear Compression
Sign in / Sign up

Export Citation Format

Share Document