Diffusers operate using the same principle as a Lens Array homogeniser and are used with multi-mode laser sources. They are designed to impart a controlled angular distribution to an input beam. PowerPhotonic’s diffusers use our freeform direct-write process to fabricate the highly non-uniform surfaces in fused silica. The optics deliver a defined intensity pattern in the far-field, with a wide variety of distributions ranging from simple Gaussian diffusers to more complex beamshapers that create spots that are flat-top or annular; all with tightly controlled angles of divergence ranging from fractions of a degree up to 10 degrees and potential transmission efficiencies in excess of 99%.
The far-field shape can be Gaussian or shaped to produce radial geometry spots: circles, ovals, rings and other rectilinear shapes. Uniquely the divergence angle can be controlled very precisely.