We propose and demonstrate generation of hollow conic beams using a new element-a metal axicon mirror. A good-quality hollow conic beam was generated from a Gaussian laser beam with high conversion efficiency. We also show that by focusing the hollow conic beam with suitable lenses, it is possible to obtain a weakly converging hollow beam for which the diameter remains between 1 and 3 mm over a propagation distance of about 10 cm, which should be of interest for atom-guiding applications. In the focal region, a nearly nondiffracting central spot of size ≈13 μm (FWHM) was observed for a propagation distance of ≈8 mm.
S. R. Mishra,
S. K. Tiwari,
S. P. Ram,
S. C. Mehendale,
"Generation of hollow conic beams using a metal axicon mirror," Optical Engineering 46(8), 084002 (1 August 2007). https://doi.org/10.1117/1.2771155