In this paper the authors outline an optical design for producing high-order Bessel-like beams with a z-dependent cone angle through the use of conventional optical elements, without the need for deliberate aberrations to be included.
Reference:
Ismail, Y, Barnes, G; Mhlanga, T et.al. 2010. Long range quasi-nondiffracting beams carrying orbital angular momentum. International Conference on Orbital Angular Momentum, University of York, UK, 23-25 March 2010, pp 68
Ismail, Y., Barnes, G., Mhlanga, T., Belyi, V., & Forbes, A. (2010). Long range quasi-nondiffracting beams carrying orbital angular momentum. http://hdl.handle.net/10204/4862
Ismail, Y, G Barnes, T Mhlanga, V Belyi, and A Forbes. "Long range quasi-nondiffracting beams carrying orbital angular momentum." (2010): http://hdl.handle.net/10204/4862
Ismail Y, Barnes G, Mhlanga T, Belyi V, Forbes A, Long range quasi-nondiffracting beams carrying orbital angular momentum; 2010. http://hdl.handle.net/10204/4862 .
