Generation of a Purely Single Transverse Mode Vortex Beam from a He-Ne Laser Cavity with a Spot-Defect Mirror
Figure 1
(a) A photograph of the fabricated spot defect mirror. The inset is a reflective optical microscope image of the mirror surface with a spot defect diameter of 20 μm. Schematics of the spot defect mirror (b) and the He-Ne laser cavity (c).
