Zobrazeno 1 - 10
of 20
pro vyhledávání: '"Cosmas Mafusire"'
Autor:
Cosmas Mafusire, Andrew Forbes
Publikováno v:
South African Journal of Science, Vol 109, Iss 11/12, Pp 6-6 (2013)
When the walls of an open-ended horizontal steel pipe are heated before the pipe is rotated along its axis, the exchange of the expelled heated air with the incoming cooler air, sucked in along the axis, results in a medium capable of focusing a lase
Externí odkaz:
https://doaj.org/article/8016e7a7245f4ac18a36a91c18de88c2
Autor:
Cosmas Mafusire, Tjaart P. J. Krüger
Publikováno v:
Journal of Modern Optics. 67:577-591
We present a derivation of a formula for Zernike-Gauss circle coefficients expressed in terms of Zernike circle coefficients for a circular Gaussian pupil by revisiting a method in which theorthono...
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e7e21a9b19b8a0feaf701792d6acf430
https://doi.org/10.1080/09500340.2020.1759712
https://doi.org/10.1080/09500340.2020.1759712
Autor:
Tjaart P. J. Krüger, Cosmas Mafusire
Publikováno v:
Journal of the Optical Society of America. A, Optics, image science, and vision. 35(6)
The concept of orthonormal vector circle polynomials is revisited by deriving a set from the Cartesian gradient of Zernike polynomials in a unit circle using a matrix-based approach. The heart of this model is a closed-form matrix equation of the gra
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b41922c502e50ac7aadbdd3f530db7ce
https://pubmed.ncbi.nlm.nih.gov/29877326
https://pubmed.ncbi.nlm.nih.gov/29877326
Autor:
Angela Dudley, Tjaart P. J. Krüger, Darryl Naidoo, Prince Mredlana, Andrew Forbes, Cosmas Mafusire
Publikováno v:
Laser Resonators, Microresonators, and Beam Control XIX.
We present an experimental technique to generate partially coherent vortex beams with an arbitrary azimuthal index using only a spatial light modulator. Our approach is based on digitally simulating the intrinsic randomness of broadband light passing
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f81d5dfe2445623f6b1398ecfe1ee4a3
https://doi.org/10.1117/12.2252000
https://doi.org/10.1117/12.2252000
Autor:
Andrew Forbes, Cosmas Mafusire
Publikováno v:
Journal of the Optical Society of America. A, Optics, image science, and vision. 33(6)
A correction is given for Eqs. (10a) and (10b) [J. Opt. Soc. Am. A28, 1372 (2011)JOAOD60740-323210.1364/JOSAA.28.001372].
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::78df860289623a048332639dd4dc6484
https://pubmed.ncbi.nlm.nih.gov/21734735
https://pubmed.ncbi.nlm.nih.gov/21734735
Autor:
Cosmas Mafusire, Tjaart P. J. Krüger
Publikováno v:
Journal of Optics. 20:065603
The University of Pretoria's Research Development Programme (TPJK) (Grant No. A0W679), and the Thuthuka Programme of the National Research Foundation of South Africa (TPJK and CM) (Grant No. 94107).
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1510e544effc142bcfb69865c14a4b35
https://doi.org/10.1088/2040-8986/aabf06
https://doi.org/10.1088/2040-8986/aabf06
Autor:
Tjaart P. J. Krüger, Cosmas Mafusire
Publikováno v:
Applied Optics. 56:2336
The concept of orthonormal polynomials is revisited by developing a Zernike-based orthonormal set for a non-circular pupil that is transmitting an aberrated, non-uniform field. We refer to this pupil as a general pupil. The process is achieved by usi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c8ffe6e337acc015c9a4e1e5d1d10246
https://doi.org/10.1364/ao.56.002336
https://doi.org/10.1364/ao.56.002336
Publikováno v:
Nature Communications. 4
The lens is a well-understood optical component used for focusing light, but is almost exclusively made in the solid-state form and, thus, suffers from optical damage at high powers. Attempts to overcome this through the use of non-solid graded-index
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::36bbd3ba57723535701354f95787c70e
https://doi.org/10.1038/ncomms2894
https://doi.org/10.1038/ncomms2894
Autor:
Andrew Forbes, Cosmas Mafusire
Publikováno v:
Fluid Dynamics, Computational Modeling and Applications
It is possible to control light in a medium comprising nothing more than a fluid, whether in gas or liquid phase. Using air as an example, it is possible to bend light by a process of continuous refraction as opposed to stepwise refraction in the cas
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::07cd8610bccc85a243c876df72e8109b
https://doi.org/10.5772/36643
https://doi.org/10.5772/36643
Autor:
Andrew Forbes, Cosmas Mafusire
Publikováno v:
SPIE Proceedings.
We outline a theory for the calculation of the laser beam quality factor of an aberrated laser beam. We provide closed form equations which show that the beam quality factor of an aberrated Gaussian beam depends on all primary aberrations except tilt
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ec08994b9ba1dd448c98c4e8c106d092
https://doi.org/10.1117/12.910598
https://doi.org/10.1117/12.910598