Lyd og Orbitalt impulsmoment (bølge)

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Forskel mellem Lyd og Orbitalt impulsmoment (bølge)

Lyd vs. Orbitalt impulsmoment (bølge)

Lydklip. Signatur Lyd er den gentagne forplantning af trykbølger gennem luft eller andre stoffer. En optisk lysbølge kan via passage af et specielt udformet holografi splittes i to OAM-lysbølger. En plasmabaseret laser kan designes, så den danner/forstærker OAM-lysbølger. Illustrationen viser lysstyrkeprofilen som funktion af strålen i 3D. Illustrationen har dog ikke noget at gøre med kilden, men den omhandler samme emne.https://www.nature.com/articles/ncomms10371 Vieira, J. et al. Amplification and generation of ultra-intense twisted laser pulses via stimulated Raman scattering. Nat. Commun. 7:10371 doi: 10.1038/ncomms10371 (2016) Citat: "...Figure 1: Generation and amplification of OAM lasers via stimulated Raman backscattering...Figure 3: Simulation results showing the generation and amplification of a new OAM modes...We note that our seed laser pulse final intensity, on the order of 10^17 W cm^−2, and seed laser spot size, on the order of 1 mm, indicate the production and amplification of Petawatt class twisted lasers with OAM..." En plasmabaseret laser kan designes, så den danner/forstærker OAM-lysbølger. Illustrationen viser lysstyrkeprofilen som funktion af strålen i 3D. Illustrationen ser ud til at være identisk med en illustration på sitet, kilden refererer til.http://web.ist.utl.pt/jorge.vieira/index.php/research/structured-light/ ist.utl.pt: Prof. Jorge Vieira: Structured light. Structured light and lasers with orbital angular momentum. A new twist for plasma physics?, https://web.archive.org/web/20171119083758/http://web.ist.utl.pt/jorge.vieira/index.php/research/structured-light/ backup Citat: "...Structured lasers have non-trivial phase structures and polarisations. A well known example of structured light is the orbital angular momentum. Lasers with orbital angular momentum are characterized by helical wavefronts, with a phase singularity at the center of the laser, and have doughnut shaped intensity profiles. They are interesting from a fundamental point of view because they possess quantized amounts of angular momentum. Unlike circularly polarized light, which is featured by spin-angular momentum, twisted lasers contain angular momentum even if they are linearly polarized...Together with Dr. Raoul Trines from Rutherford Appleton Laboratory, I have recently shown that Raman backscattering can efficiently generate and amplify twisted lasers with orbital angular momentum...A laser with orbital angular momentum in a special configuration of stimulated Raman backscattering in plasmas..." Orbitalt impulsmoment (OAM) er en egenskab ved både tværbølger og længdebølger, som specificerer den geometriske orientering af bølgefronten.