Figure 4
From: Polarization conversion when focusing cylindrically polarized vortex beams
Experimental optical setup. The solid-state laser has an output wavelength λ = 532 nm, PH is a pinhole (100-μm aperture), P is a polarizer, D is a diaphragm, S is an S-waveplate (radial polarization converter), DOE is an amplitude diffractive optical element forming a superposition of eight vortex beams with orders of ±1, ±2, ±3, and ±4, L is a lens with a focal length f = 150 mm, A is an analyser, and CMOS is a CMOS-video camera (LOMO TC-1000, 3664×2740 pixel resolution).
