l=1 vortex created from HG10 mode directly from laser
Far-field of Gaussian beam cut with 1 glass slide and resulting l=1
vortex
Cutting a HG10 mode with a glass slide to create a quasi HG20
l=2 vortex created by quasi HG20 and an off-axis configuration of the
same vortex with 3 holes
Cutting a Gaussian mode with a glass slide off-axis and resulting l=1
vortex
Cutting a Gaussian mode with a glass slide at a steep angle and a
resulting vortex array of sorts (reflections from different faces of the
slide may have caused the extra
lobes?)
Cutting a Gaussian mode with 2 glass slides and resulting l=2 vortex