Rocky Mountain Instrument (RMI) is a company that designs and manufactures optics, thin film coatings, optical assemblies, and opto-mechanical components. Its products include spherical lenses, triplets, wedges, metal mirrors, prisms, etc. The company offers interferometry, engineering, testing, diamond-turning, and environmental testing services. RMI caters to aerospace, defense, medical, life sciences, semiconductor, and other sectors.