Their improvement to the Kyropoulos technology is known as "ES2", and was developed in their Illinois-based crystal growth facilities.

[1] The company's products have been used in the LED industry and for the production of silicon on sapphire wafers for integrated circuits (RFICs), as well as on high-quality optical and industrial applications for high-performance sapphire.

In 2003, its polishing capacity was added, and it received ISO 9001 certification in the following year.

[2] Rubicon Technology is engaged in developing, manufacturing and selling monocrystalline sapphire and other crystalline products for light-emitting diodes, radio-frequency integrated circuits, optoelectronics, and other optical applications.

Additionally, Rubicon produces optical windows, with applications ranging from defense/aerospace and instrumentation to medical devices and polished epi-ready substrates.