Application of orbital angular momentum to simultaneous determination of tilt and lateral displacement of a misaligned laser beam

2010 ◽  
Vol 27 (10) ◽  
pp. 2337 ◽  
Author(s):  
J. Lin ◽  
X.-C. Yuan ◽  
Mingzhou Chen ◽  
J. C. Dainty
2012 ◽  
Vol 100 (23) ◽  
pp. 231115 ◽  
Author(s):  
Michael Mazilu ◽  
Areti Mourka ◽  
Tom Vettenburg ◽  
Ewan M. Wright ◽  
Kishan Dholakia

Author(s):  
Daniel Cardoso

An analysis of the consistency of the Abraham and Minkowski momenta in the determination of the photon trajectory was carried out considering a new principle of conservation of the photon's mechanical energy, in which the photon conserves translational energy in orbital angular momentum when transiting between two media, introducing the relativistic energy wave (REW). The confrontation between REW and the recent theory of space-time waves (ST) was considered, pondering your differences. Throughout this study it was possible to verify that the Abraham momentum appears a relativistic photon ignition device in the transition between two media, acting as the hidden momentum of the Minkowski’s relativistic momentum. The wavy behavior in the matter is relativistic, and the relativistic trajectory appears with delays and advances, with points of synchronization between source-observer. The classical or relativistic trajectories are determined as a function of the angle of incidence and the relative refractive index, by one of two distinct non-additive torques, the classic by Abraham or the relativistic by Minkowski. It was found that the same analysis conducted under the principle of conservation of the mechanical energy of the photon can be treated by an new Doppler, Relativistic Apparent, that can be confused with other Dopplers in the treatment of redshift from distant sources. It was found that the conservation of energy in Orbital Angular Momentum (OAM), in the interaction with matter, explains that the synchronization instants are found in the inversion of the OAM, where the advances and delays of REW occur under negligible variations of the OAM, however, opposites.


2009 ◽  
Vol 18 (05n06) ◽  
pp. 1116-1134 ◽  
Author(s):  
ANTHONY W. THOMAS

Since the announcement of the proton spin crisis by the European Muon Collaboration there has been considerable progress in unravelling the distribution of spin and orbital angular momentum within the proton. We review the current status of the problem, showing that not only have strong upper limits have been placed on the amount of polarized glue in the proton but that the experimental determination of the spin content has become much more precise. It is now clear that the origin of the discrepancy between experiment and the naive expectation of the fraction of spin carried by the quarks and anti-quarks in the proton lies in the non-perturbative structure of the proton. We explain how the features expected in a modern, relativistic and chirally symmetric description of nucleon structure naturally explain the current data. The consequences of this explanation for the presence of orbital angular momentum on quarks and gluons is reviewed and comparison made with recent results from lattice QCD and experimental data.


2017 ◽  
Vol 41 (4) ◽  
pp. 573-576 ◽  
Author(s):  
V. V. Kotlyar ◽  
A. A. Kovalev

2018 ◽  
Vol 98 (3) ◽  
Author(s):  
R. Nuter ◽  
Ph. Korneev ◽  
I. Thiele ◽  
V. Tikhonchuk

2019 ◽  
Vol 125 (11) ◽  
Author(s):  
Jonas B. Ohland ◽  
Udo Eisenbarth ◽  
Markus Roth ◽  
Vincent Bagnoud

Abstract Laguerre–Gaussian-like laser beams have been proposed for driving experiments with high-intensity lasers. They carry orbital angular momentum and exhibit a ring-shaped intensity distribution in the far field which make them particularly attractive for various applications. We show experimentally and numerically that this donut-like shape is extremely sensitive to off-axis wavefront deformations. To support our claim, we generate a Laguerre–Gaussian-like laser beam and apply a selection of common low-order wavefront aberrations. We investigate the visibility of those wavefront deformations in the far field. Under use of established tolerance criteria, we determine the thresholds for the applied aberration and compare the findings with simulations for verification.


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