Diffractive Diffusers0 pages

LASERS & MATERIAL PROCESSING I OPTICAL SYSTEMS I INDUSTRIAL METROLOGY I TRAFFIC SOLUTIONS I DEFENSE & CIVIL SYSTEMS

Diffractive Diffusers

Diffractive diffusers spread and homogenize laser beams
over a controlled small angle. This results in a uniform farfield intensity profile with very sharp edges and a top-hat
like or a custom shape. Low scattering and sharp profile
edges result in higher efficiencies compared to conventional diffusers. Diffractive diffusers may be used as a
single optical component to generate the desired intensity
profile in a larger distance. The profile dimensions are
determined by the distance and the diffuser angle.
A combination of diffractive diffuser and focusing lens t
generates the uniform illumination at the focus plane
of the lens. The profile dimensions depend on the focal
length of the lens and the diffuser angle.
Features:
•t Controlled small diffuser angle
•t High efficiency within specified angle
•t Uniform top-hat or custom illumination profiles
•t Different spot geometries
•t Wavelengths from deep UV to infrared
•t High damage threshold and lifetime t
•t Insensitive to input beam shape and misalignment
Applications:
•t Laser materials processing with optimized spot t
geometries and intensity profiles
•t Medical laser treatment, e.g. with excimer lasers
•t Homogeneous illumination in mask projection systems
•t Highly efficient diffuse illumination of lens array t
homogenizers
•t Laser beam homogenizing and shaping

Microoptics