MG2 factor of truncated Laguerre-Gaussian beams
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1.
Institute of Laser Physics & Chemistry, Sichuan University, Chengdu 610064, China;
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2.
College of Physics & Communication Electronics, Jiangxi Normal University, Nanchang 330027, China
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Received Date:
2003-05-26
Accepted Date:
2003-07-09
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Abstract
The generalized beam propagation factor(MG2 factor) of circularly symmetric truncated Laguerre-Gaussian beams is studied using the generalized truncated second-order moments method. A closed-form expression for the MG2 factor is derived and illustrated with numerical example. It is found that the MG2 factor of circularly symmetric truncated Laguerre-Gaussian beams depends on the truncation parameter and beam order,and asymptotically approaches the value of circularly symmetric untruncated Laguerre-Gaissain beams as the truncated parameter increases.
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