Chin. Phys. Lett.  2008, Vol. 25 Issue (12): 4227-4229    DOI:
Original Articles |
Gauge-Invariant Spin and Orbital Angular Momentum of Laguerre--Gaussian Laser
LIANG Wen-Feng, WU Ming, LIU Hui, CHEN Xiang-Song
Department of Physics, Sichuan University, Chengdu 610064
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LIANG Wen-Feng, WU Ming, LIU Hui et al  2008 Chin. Phys. Lett. 25 4227-4229
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Abstract We adopt a gauge-invariant definition to calculate the spin and orbital angular momenta of a so-called lth order Laguerre--Gaussian laser. The results reveal that photons on the axis of the beam may carry an orbital angular momentum of (l-1) besides l per photon. For the spin, we obtain a more reasonable expression proportional to the beam intensity instead of the gradient of the intensity as previously derived. We also discuss how to experimentally discriminate the angular momentum expressions given here and those commonly accepted in the literature.
Keywords: 12.20.-m      11.15.-q      42.60.By      42.25.Ja     
Received: 03 September 2008      Published: 27 November 2008
PACS:  12.20.-m (Quantum electrodynamics)  
  11.15.-q (Gauge field theories)  
  42.60.By (Design of specific laser systems)  
  42.25.Ja (Polarization)  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y2008/V25/I12/04227
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LIANG Wen-Feng
WU Ming
LIU Hui
CHEN Xiang-Song
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