Introduction By using a hybrid diffractive/refractive lens, ULO Optics can superimpose the focal points for two different wavelengths with a single element. Most commonly this is done for the CO2 10.6μm and a HeNe 633nm (or red diode) wavelengths where the focus of the red beam for an uncorrected lens will be 13% shorter than the CO2. In applications, such as medical, where this presents a problem, both the red and the CO2 can be made to have a coincident focus. ULO Optics diffractive hybrid achromatic lenses are custom designed for specific applications. As a stand-alone lens, typically, it would be a plano-convex or meniscus type with the diffractive element on one surface. The hybrid lens can also be used to correct the chromatic aberration in a multiple lens set. Lenses are made to the user defined lens diameter, focal length and coated with a dual band AR. A broad band (620 to 650nm) DBAR is also available for applications where the diode wavelength is not precisely specified.
Specifications Material: Laser grade ZnSe Focal length: Within 1% Centration: ETV < 0.05mm Absorption: typically 0.3% Transmission: > 99.5% @ 10.6μm > 93% @633nm Coating: DBAR 10.6μm/633nm. Surfaces: Spherical or aspheric convex surface, diamond-machined diffractive surface Damage threshold: CW 3000W/mm at 10.6μm
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.