LohnStar Optics is an american company specialized in providing high quality, custom, IR thin film coatings. Typical coatings applications are Quantum Cascade Lasers, CO2 Lasers, Er:YAG Lasers, and Cavity Ring Down Spectroscopy (CRDS).
Some examples of typical coatings:
Ultra-Low Loss Supermirrors from 1µm-11µm
Quantum Cascade Laser coatings (AR, BBAR, PR, mirror coatings)
High damage threshold coatings for CO2, Er:YAG and high-power chemical lasers at wavelengths from 2-16 microns
Sputtered thin film filters from 250nm out to 50+ microns, including diamond-like carbon.