Efficient conversion of a Gaussian beam to a high purity helical beam
- 作者：Machavariani ; Galina ; Davidson ; Nir ; Hasman ; Erez ; Blit ; Shmuel ; Ishaaya ; Amiel A. ; Friesem ; Asher A.
- 关键词：41.85.Ct ; 41.85.Ew ; 42.60.Jf ; Helical beams ; Beam conversion ; Phase elements ; Laser beams
- 刊名：Optics Communications
- 出版年：2002
- 期刊代码：50_00304018
- 类别：ph
- 出版时间：August 15, 2002
- 卷：209
- 期：4-6
- 页码：265-271
- 文件大小：286 K
摘要
A method for efficiently converting a Gaussian beam into a helical Laguerre–Gaussian (LG) beam is presented. It is based on using a pair of axicons to produce a shifted-Gaussian (doughnut) intensity distribution that is then passed through a spiral phase element. It is shown that the conversion efficiency can be as high as 
98%, and the calculated far-field intensity distributions of the output beams are very close to those of corresponding pure LG intensity distributions. The principle of the method, the needed optical arrangement, and calculated and experimental results are presented.
98%, and the calculated far-field intensity distributions of the output beams are very close to those of corresponding pure LG intensity distributions. The principle of the method, the needed optical arrangement, and calculated and experimental results are presented.