Diffractive optical elements are used with high power lasers at an
increasing rate. Achieving a homogeneous intensity distribution (top
hat) in the laser beam is very difficult in industrial applications.
The demands on the incoming beam are high when using a top hat element.
In addition to exact specifications, extremely exact positioning must
be guaranteed. Even slight deviations lead directly to a deterioration
of the beam profile.
For this reason the product was further developed by Holo/OR. So-called
stable-top elements are now availabe that combine the positive
characteristics of the good homogeneity of a top hat with the
flexibility of a homogenizer. Stable tops have steep edges and are not
as sensitive to x/y positioning and the incoming beam. However, they
exhibit a certain amount of waviness and a spike at the edge.
Stable tops can be developed to meet customer specifications for all
wavelengths, typically from 355 nm to 10.6 µm. The first standard
elements are available for 10.6 µm, 1064 nm, and 532 nm. Laser
Components is the official distributor for these elements.
More information at http://www.lasercomponents.com/