Zobrazeno 1 - 10
of 148
pro vyhledávání: '"Geoff Dearden"'
Publikováno v:
Micromachines, Vol 15, Iss 9, p 1146 (2024)
This study examines the wettability behaviour of 304 stainless steel (304SS) and Ti-6Al-4V (Ti64) surfaces after sequential nanosecond (ns) and picosecond (ps) laser texturing; in particular, how the multi-scale surface structures created influence t
Externí odkaz:
https://doaj.org/article/28a4ae6049a84c0b899ddd247999dd4b
Publikováno v:
Opto-Electronic Advances, Vol 5, Iss 1, Pp 1-12 (2022)
The optical nonlinearity in polycrystalline zinc selenide (ZnSe), excited with 775 nm, 1 kHz femtosecond laser pulses was investigated via the nonlinear transmission with material thickness and the Z scan technique. The measured two photon absorption
Externí odkaz:
https://doaj.org/article/66ac9ef89f6a4f0681d9a6a034140d2b
Autor:
Zheng Fang, Tong Zhou, Walter Perrie, Matthew Bilton, Jörg Schille, Udo Löschner, Stuart Edwardson, Geoff Dearden
Publikováno v:
Materials, Vol 15, Iss 24, p 9059 (2022)
A pulse burst optical system has been developed, able to alter an energetic, ultrafast 10 ps, 5 kHz output pulse train to 323 MHz intra-burst frequency at the fundamental 5 kHz repetition rate. An optical delay line consisting of a beam-splitting pol
Externí odkaz:
https://doaj.org/article/3849e904b03548a09cb5f9bbb3bc4956
Autor:
Yue Tang, Walter Perrie, David Rico Sierra, Qianliang Li, Dun Liu, Stuart P. Edwardson, Geoff Dearden
Publikováno v:
Micromachines, Vol 12, Iss 4, p 376 (2021)
Diffractive multi-beams based on 1 × 5 and 2 × 2 binary Dammann gratings applied to a spatial light modulator (SLM) combined with a nanostructured S-wave plate have been used to generate uniform multiple cylindrical vector beams with radial and azi
Externí odkaz:
https://doaj.org/article/154d6ea90efa428c9baf0e676e0f4b58
Autor:
Tong Zhou, Sebastian Kraft, Walter Perrie, Jörg Schille, Udo Löschner, Stuart Edwardson, Geoff Dearden
Publikováno v:
Materials, Vol 14, Iss 9, p 2243 (2021)
We report on novel observations of directed re-deposition of ablation debris during the ultrafast laser micro-structuring of stainless steel in the air with multi-beams in close proximity on the surface. This interesting phenomenon is observed with b
Externí odkaz:
https://doaj.org/article/a94725b997ee40bf8da30d05b879db14
Publikováno v:
OPTICS AND LASER TECHNOLOGY
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a30edeefe276bc93faf6a2ba035181af
Autor:
Geoff Dearden, Paul R. Chalker, Yue Tang, Walter Perrie, Olivier Allegre, Qianliang Li, Zhaoqing Li, Stuart Edwardson, Janet Ho
Publikováno v:
Li, Q, Perrie, W, Tang, Y, Allegre, O, Ho, J, Chalker, P R, Li, Z, Edwardson, S P & Dearden, G 2020, ' A study on ultrafast laser micromachining and optical properties of amorphous polyether(ether)ketone (PEEK) films ', Procedia CIRP . https://doi.org/10.1016/j.procir.2020.09.113
Polyether(ether)ketone (PEEK) has been widely used in the electronics and biomedical industries due to excellent electrical, chemical and thermal stability. The ablation and optical properties of amorphous PEEK have been investigated using ultrahigh
Publikováno v:
Optical Materials. 133:113010
Autor:
Joerg Schille, Udo Loeschner, Yue Tang, Walter Perrie, Geoff Dearden, Liu Dun, Zheng Kuang, Stuart Edwardson, Jiangning Li
Publikováno v:
OPTICS AND LASERS IN ENGINEERING
An imaging based beam shaping technique combined with parallel beam processing has been demonstrated. Binary and intensity masks have been designed and applied on phase only spatial light modulator (SLM) to shape the input laser beam in the desired p
Autor:
Qianliang Li, Walter Perrie, Andrew Forbes, Geoff Dearden, Udo Loeschner, Liu Dun, Joerg Schille, Stuart Edwardson, Yuei Tang
Publikováno v:
Journal of Physics D: Applied Physics
Cylindrical vector vortex (CVV) beams are topical forms of structured light, and have been studied extensively as single beams, non-separable in two degrees of freedom: spatial mode and polarisation. Here we create arrays of CVV beams using a combina
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d0882ffe6309612d6199d96417294705
http://livrepository.liverpool.ac.uk/3103206/1/Tang_2020_J._Phys._D__Appl._Phys._53_465101.pdf
http://livrepository.liverpool.ac.uk/3103206/1/Tang_2020_J._Phys._D__Appl._Phys._53_465101.pdf