For applications such as metrology and sensitive material processing, HOLO/OR has designed a compact universal module for blocking undesired spots of Multi-Spots or the “halo” effect of Homogenizers, providing a precise shape and energy distribution at the focal plane.
The Undesired Diffractive Order Blocker (UDOB) can also be used to increase the edge sharpness of diffusers/homogenizers.
A typical setup for a UDOB application is shown with the following sub-modules:
For Ultra-High-power lasers, Holo/Or has released a new UDOB design based on folded mirrors and an aperture in the optical path.
This design is open for customers, and can be modified according to the customer’s requirements.
The published version works for small angle DOEs and currently contains element DS-186-U-Y-A which is implemented in the Zemax file by a diffraction grating surface. The wavelength used in the published version is 355nm.