Redwave Glass unveils new chalcogenide glass options for mid- and longwave IR use

May 10, 2018
The new bulk chalcogenide materials have transmissions from 0.9 to more than 18 microns.

Redwave Glass (Rochester, NY) has announced that glass production qualifications have now been completed for three of its new chalcogenide materials. Licensed from the U.S. Naval Research Laboratories, the three new chalcogenide glasses are now commercially available.

Under the brand name MG, this line of IR glasses offers broader spectral performance along with a better range of dispersion and index characteristics. Optical designs can now be produced that are not limited by diamond-turning germanium. All MG glasses are moldable and compatible with traditional grinding/polishing and diamond turning.

The three new materials are:

• MG 448 – very low dispersion in the mid and long wave

• MG 452 – near zero thermal expansion, lower dn/dT than arsenic selenide glasses

• MG 523 – compare to germanium but with lower dn/dT

Along with offering these three new glass materials, Redwave Glass is producing As40Se60 glass. MG 463 is available in boules that are 2 inches in diameter. Compared to standard arsenic selenide glass, MG 463 is unmatched in spectral performance with transmission beyond 16 microns, says Redwave Glass.

A Zemax data catalog is available; in addition, current Zemax users will have MG glass data included with their next update.

For more info and to download a summary spec sheet for all four materials, visit

Source: Redwave Glass

About the Author

John Wallace | Senior Technical Editor (1998-2022)

John Wallace was with Laser Focus World for nearly 25 years, retiring in late June 2022. He obtained a bachelor's degree in mechanical engineering and physics at Rutgers University and a master's in optical engineering at the University of Rochester. Before becoming an editor, John worked as an engineer at RCA, Exxon, Eastman Kodak, and GCA Corporation.

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