ULO Optics’ multi-element f-Theta lenses are designed for superior performance for working distances between 75 and 300 mm and field sizes up to 210 x 210 mm, for high power laser applications like marking, welding and structuring. The ZnSe lenses are highly transmissive and are mounted in an aluminum housing for easy handling. A protective window can be included and is recommended for short working distances. Our lenses are available with different coatings as needed.
Doublets, the ZSD-15-Series
The ZSD-15 series doublets contain ZnSe elements made from the same laser grade ZnSe and fully coated with low absorption anti-reflection coatings. They are capable of handling high powers while focusing down to smaller spots.
The ZnSe-Triplets, ZST-15-75 and ZST-15-100
focal lengths 75 and 100mm respectively, where higher performance than the doublets is required
the 75mm focal length lens is also nearly telecentric (see below) with the focused beam less than 5° to the normal
diffraction limited performance over the entire image plane
can be fitted with a protective window
Spot Diameter (s.d.)*
118 (25) micron
139 (22) micron
225 (0) micron
282 (0) micron
338 (0) micron
89 (4) micron
113 (1) micron
s.d.* = Standard deviation
Spot diameter is determined from optical computation and are not measured values from marking or engraving. The width of an engraved line is affected by laser power, material, scan speed, etc and is normally less than the values listed here.
Please note that this page is only a representation of our most commonly used replacement f-Theta multi-element lenses and is not our entire product line. If there is an item not listed or you have questions, please feel free to contact us and we will be more than happy to assist you.
ULO Optics is an ISO certified company and quality is at the heart of everything we do. With a host of industrial affiliations you can rely on ULO to deliver.
Beam Expanders for 1μm lasers
ULO Optics are excited to introduce our new range of beamexpanders. Designed for low power (500w) lasers such as Nd:YAG and Yb doped fibre lasers operating near the 1μm wavelength. The beamexpanders are of Galillean design and use Multi-spectral Zinc Sulphide for the optics which has an absorption at 1μm of 0.0005cm−1 (Similar to ZnSe at 10.6μm). Learn more…
Diversification into 1 micron optics
ULO Collaborate on the LaserSnake2 project, developing laser cutting optics for safe, remote cutting in air and in water, focused on nuclear decommissioning.
ULO Optics develops CO2 Brewster plate beamcombiner
In our new beamcombiner – C-BC-2, pairs of enhanced Brewster Windows are used to attenuate a linearly polarised CO2 laser beam. The Brewster plate acts like a polarising beamsplitter. The difference in reflectance also allows two perpendicular polarised beams to be combined into a single beam.