Orbitalt impulsmoment (bølge): Forskelle mellem versioner

[[Fil:Twisted light generated in a plasma.png|thumb|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.<ref>[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..."</ref>]]

[[Fil:Twisted Light.png|thumb|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.<ref>[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..."</ref>]]

 

 

OAM kan yderligere inddeles i '''intern OAM''' og '''ekstern OAM'''. Den interne OAM er en oprindelsesuafhængige EM-angulære moment og kan forbindes med en [[skruelinje]]formet eller vreden [[bølgefront]]. Den eksterne OAM er den oprindelsesafhængige EM-angulære moment som kan bestemmes som [[krydsprodukt]]et af EM-stråle positionen (strålens centrum) og dens totale [[Impuls (fysik)|lineære impuls]].