Inscription in the glass of efficient Gauss to top-hat converters based on Pancharatnam-Berry phase by high power femtosecond laser pulses

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

“…In this section, we report on the performance of the PBP element that was manufactured by Altechna R&D with the transmittance being higher than 90% over a broad spectral region [63]. This implementation of GPOE enables beam-shaping of high-energy beams because these elements can withstand pulses of 1.5 mJ energy and 158 fs FWHM duration at 1030 nm [41,43].…”

In situ thermal characterisation and filamentary modification in Polymethylpentene

“…Internal inscription using ultrafast laser pulses is a powerful approach for fabricating advanced devices of diffractive optics [10], optoelectronic [11], lab-on-chip [12], micro-electro-mechanical systems (MEMS) [13], photonic crystal fibres [14], and quantum computing devices [15]. The lithography can be employed to produce similar structures with more accuracy and precise than laser inscription.…”