Efficient formation of pure helical laser beams
نویسندگان
چکیده
A novel method for forming pure helical laser beams of pre-determined helicity is presented. It is mainly based on replacing one of the laser mirrors with a spiral phase element. The basic principles along with experimental results using a CO laser are described. q 2000 Elsevier Science B.V. All rights reserved. 2 PACS: 41.85.Ct; 41.85.Ew; 42.60.Jf; 42.60.Da
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