Generation of a Purely Single Transverse Mode Vortex Beam from a He-Ne Laser Cavity with a Spot-Defect Mirror

<table>Intensity distributions of the generated beams for different spot defect diameters <i>d</i> of (a) 0 <i>μ</i>m, (b) 13 <i>μ</i>m, (c) 20 <i>μ</i>m, and (d) 50 <i>μ</i>m.</table>

International Journal of Optics

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Figure 2

Figure 2: Generation of a Purely Single Transverse Mode Vortex Beam from a He-Ne Laser Cavity with a Spot-Defect Mirror 