Recently I came across a research paper on the synthesis of novel Infrared transparent glass using the method and constituents as described in 'AmshuBodhini' of Maharshi Bharadwaj by the name of 'Prakasha Stambhanabhid Lauha'. Results were astounding.
2)The constituent raw materials were mixed together in the ratios mentioned in the text. This mixture was melted in a graphite crucible at a temperature of 265 KAKSYA on an ancient temperature scale (about 950°C) and was then
rapidly poured into a fireclay dye,
3)which was then cooled very slowly in the muffle furnace to produce a new material
which was a non-hygroscopic, non-opulent greenish yellow calcium glass. The test results revealed that this new glass could be compared with Calcium Fluoride Glass,with a transparency in
4)the wavelength range of 5000cm-1 to 1200 cm-1(2 to 8.33 μ). It is important to note that, this material is novel in the sense that the most of the known infrared transparent materials used for prisms and windows for cells, are highly hygroscopic in nature such as LiF (up to 6π)
5)CaF2 (2 to 8.5 μ), NaCl (up to 15 μ) etc; requiring dry air environment for their working while the new glass is non-hygroscopic in nature, can be used under any environmental conditions with a very high average life.
Link to original paper: goo.gl/K3qYLV
6)More insight into 'Prakasha Stambhanabhid Lauha'(IR transparent glass) of Maharshi Bharadwaja :
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