Why do Er laser mirrors need a different coating approach?

Eksma Optics Logo 2021At 2940 nm, even small amounts of parasitic absorption in the system can affect Er laser performance. Coating solutions that work well in the near-infrared do not necessarily deliver the same results at this wavelength.

In the new white paper from our partner Eksma Optics, they explore the material and deposition choices behind reliable high-reflectivity (HR) coatings for Er lasers.

The paper covers:
🔹 Why conventional near-IR coating approaches face challenges at 2.94 µm
🔹 How TiO₂/SiO₂ coatings and ion-assisted deposition (IAD) help manage absorption
🔹 Why coating durability, humidity resistance and resonator design matter
🔹 What to consider when qualifying coatings for Er laser applications

One key result: our TiO₂/SiO₂ HR coating achieves reflectivity above 99.8% at 2940 nm.

 

Have a look at the whitepaper:

Paper Eska optics ER coatings-1
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