Wave front sensing of an optical vortex

Adaptive Optics and Optical Vortices

“…The experimental setup for registration of an optical vortex wavefront consists of a system for formation of collimated laser beam, the Mach-Zehnder interferometer (as in the scheme in Figure 10), and the additionally induced the Hartmann-Shack wavefront sensor [160,161]. It is shown in Figure 15 A technical feature of the Hartmann-Shack wavefront sensor used involves the employment of a raster of 8-level diffraction Fresnel lenses as the lenslet array (see Figure 16).…”

“…Experiments with a different number of registration spots on the hartmannogram have been carried out [160,161]. When using a lenslet array with subaperture size d=0.3 mm, focal length f=25 mm and d=0.2 mm, f=15 mm, the picture from 8×8 and 16x16 focal spots on the CCD camera screen has been registered, respectively.…”

“…In Figure 18 we present the wave front surface of optical vortex reconstructed by the Hartmann-Shack sensor [161,164] with software incorporating the code of restoration of singular phase surfaces [157][158][159]. Comparison of experimental data with calculated results shows that the wave front surface is restored by the actual Hartmann Shack wavefront sensor with good quality despite the rather small size of the matrix of wave front tilts (spots in the hartmannogram).…”

Adaptive Optics Progress

“…The experimental setup for registration of an optical vortex wavefront consists of a system for formation of collimated laser beam, the Mach-Zehnder interferometer (as in the scheme in Figure 10), and the additionally induced the Hartmann-Shack wavefront sensor [160,161]. It is shown in Figure 15.…”