The high power diffractive optical element market is experiencing a major boom in recent years, as DOE powered applications such as aesthetic laser treatments, laser glass cutting, laser micro-machining and laser welding are gaining popularity and acceptance. Many new players are joining the fields, some less aware of the advantages and uniqueness of diffractive optical elements, and thus we at Holo/Or feel there is a need to go over some diffractive optical element basics so our customers better understand what DOEs can offer.