Abstract
Axicon is an interesting optical element for its optical properties. This paper presents an approach to dynamically generated tunable axicons with a spatial light modulator (SLM). 256-level phase computer-generated holograms (CGHs) were loaded into the SLM to simulate the positive and negative axicons. The intensity distributions of beams passing through these axicons were analyzed with the principle of blazed grating and Fresnel diffraction; and the diffraction patterns were obtained theoretically in terms of zero-order Bessel beams and annular hollow beams, corresponding to the positive and negative axicons, respectively. Experimental results verified that the diffraction patterns have the same distribution as the real axicon. The types of the axicon and the axicon’s parameters can be easily altered through changing the CGHs.
Highlights
The ‘axicon’, first introduced by Mcleod J
By comparing Equations (3) and (21) and Equations (4) and (22), it can be found that the center-spot radius and the maximum transmission distance of the nondiffracting beams realized by the axicon and spatial light modulator (SLM) are similar
The results show that both the axicon and SLM satisfy the principles that the intensity first increases, and, after reaching a peak, it begins to decrease with the extension of the transmission distance
Summary
The ‘axicon’, first introduced by Mcleod J. Milne G. et al obtained tunable Bessel beams with a fluidic axicon, which is filled with refractive index variable liquid The shortcoming of this method is that it needs a real glass and linear axicons[10]. G. et al.used obtained tunable Bessel beams with a fluidic axicon, whichanis axicon as a model the computer-generated holograms (CGHs) to achieve filled with refractive index variable liquid. The shortcoming of this method is that it needs a real glass approximately diffraction-free, arbitrary-order Bessel beam series [11,12,13,14,15]. This to method can dynamically generate tunable axicons without fabrication errors to suit different applications
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