Rocky Mountain Instrument Co.

CO2 Laser Optics » LoLA™ Lens

RMI’s signature Low Laser Absorption or LoLA Lens is an ultra-low absorbing optical lens that has been specially designed to optimize CO2 laser performance.

Combining our highest quality Zinc Selenide (ZnSe) material and our unique thin film coating formula, refined from years of development, we have created an optimal lens with a low absorption of ≤ 0.13%. These technical advancements enable peak laser cutting performance and extended life. All lenses and optical components ship direct from our factory.

Material: ZnSe
Surface Figure:
Both Surfaces
λ/40 at 10.6 µm
Surface Quality:
Both Surfaces
Diameter Tolerance: + 0.000", – 0.010"
Thickness Tolerance: ± 0.010"
Focal Length Tolerance: ± 0.5%
Centration Error: < 3 arc minutes
Bevels: 0.010" – 0.030" at 45º
Clear Aperture: Central 90% of diameter
10.6 μm Narrowband Anti-Reflection (NAR)
Reflectance: R ≤ 0.2% at 10.6 μm 
Damage Threshold: λ > 10.6 μm: 2 J/cm2, 10 ns pulse
Absorption ≤ 0.13%


The Narrowband Anti-Reflection Coating reduces surface reflectance to less than 0.2% at the specified center wavelength. This dielectric coating is durable and highly resistant to laser damage.