Orbital angular momentum of light and the transformation of Laguerre-Gaussian laser modes. Allen, L., Beijersbergen, M. W., Spreeuw, R. J. C., & Woerdman, J. P. Physical Review A, 45(11):8185, June, 1992.
Orbital angular momentum of light and the transformation of Laguerre-Gaussian laser modes [link]Paper  doi  abstract   bibtex   
Laser light with a Laguerre-Gaussian amplitude distribution is found to have a well-defined orbital angular momentum. An astigmatic optical system may be used to transform a high-order Laguerre-Gaussian mode into a high-order Hermite-Gaussian mode reversibly. An experiment is proposed to measure the mechanical torque induced by the transfer of orbital angular momentum associated with such a transformation.
@article{allen_orbital_1992,
	title = {Orbital angular momentum of light and the transformation of {Laguerre}-{Gaussian} laser modes},
	volume = {45},
	url = {http://link.aps.org/doi/10.1103/PhysRevA.45.8185},
	doi = {10.1103/PhysRevA.45.8185},
	abstract = {Laser light with a Laguerre-Gaussian amplitude distribution is found to have a well-defined orbital angular momentum. An astigmatic optical system may be used to transform a high-order Laguerre-Gaussian mode into a high-order Hermite-Gaussian mode reversibly. An experiment is proposed to measure the mechanical torque induced by the transfer of orbital angular momentum associated with such a transformation.},
	number = {11},
	urldate = {2011-02-16TZ},
	journal = {Physical Review A},
	author = {Allen, L. and Beijersbergen, M. W. and Spreeuw, R. J. C. and Woerdman, J. P.},
	month = jun,
	year = {1992},
	pages = {8185}
}

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