Journal
JOURNAL OF OPTICS
Volume 15, Issue 4, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2040-8978/15/4/044005
Keywords
optical vortices; optical orbital angular momentum; spiral phase mirror; precision machining
Categories
Funding
- Australian Research Council [CE110001027, DP1092891]
- China Scholarship Council
- Hunan Provincial Innovation Foundation For Postgraduate
- Alexander von Humboldt foundation
- Australian Research Council [DP1092891] Funding Source: Australian Research Council
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We report on the generation of optical vortex beams using spatial phase modulation with spiral phase mirrors. The spiral phase mirrors are manufactured by direct machining with an ultra-precision single point diamond turning lathe. The imperfection of the machined phase mirrors and its impact on the generated vortex beams are analyzed with interferometric measurements. Our phase mirror has a surface roughness of 3 nm and a maximum peak-valley deviation of lambda/30. The vortex charges of our light beams are directly verified by counting the fringes of their corresponding interferograms. We directly observed the successful generation of an optical vortex beam with a charge as high as 5050. We study the Fourier images of the vortex beams to characterize the quality of the beams. We obtained a conversion efficiency of 92.8% from a TEM00 beam to a vortex beam with charge 1020. This technique of generating optical singularities can potentially be used to produce more complex optical wavefronts, such as optical knots.
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