The results of the addition of Se to gallium lanthanum sulphide (GLS) glass through the substitution of Ga2S3 by Ga2Se3 are described. An innovative open melting apparatus is used. The addition of selenium to GLS glass generally results in a lower glass transition temperature and an extended transmission
The enhanced infrared performance of a new modified Gallium Lanthium Sulphide (GLS) chalcogenide glass family is illustrated in this transmission curve. Details of the modification and the range transmission achieved are in Dan Hewak’s latest presentation.
The strong bonding and high glass transition temperature that characterise GLS glasses are maintained in this formulation and are anticipated to yield the enhanced mechanical, thermal and chemical durability seen in previous GLS glasses relative to other chalcogenide glasses. Further improvement of the loss in the infrared band and extended characterisation is anticipated in the coming months.
With a new glass formulation, ChAMP has extended the transmission of high durability non-toxic chalcogenide glasses from the visible to the thermal infrared LWIR band
Visible imaging through extended GLS glass
Simultaneous thermal imaging and visible edge recognition imaging through extended GLS glass
Images show a thermal LWIR image from 7-14 microns being simultaneously transmitted through the same glass as the visible image. With a glass formulation specifically chosen for its strong covalent bonding this new glass also has a transition temperature of over 450C, more than twice as high as other common chalcognides. This makes extended GLS physically, mechanically and chemically robust and compatible with molding and diamond turning. Opening the way to a new generation of light weight single optic simultaneous multiband visible, short-wave, mid-wave and long-wave imaging camera systems for applications in security, industrial and medical sensing.
ChAMP is an EPSRC funded partnership between 5 leading universities and 15 industrial partners dedicated to establishing the UK as a world leader in chalcogenide-glass technology through the development of advanced manufacturing techniques and practical application demonstrations