Beam shaping elements can be used for redistribution of power in arrays of high power laser diodes. These arrays have industrial applications but are highly inefficient due to their poor beam quality. DOEs can be used to improve the beam quality. In telecommunications, it is sometimes advantages to couple light into higher order modes. These modes may be more efficient or exist in speciality fibres. DOEs can be used to create specific phase profiles that allow coupling of light into such modes.
Diffractive axicons for Bessel beam generation
Fabrication and characterization of axicon: