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SUMMARY:Space quality optical glass: Manufacturing to quality assessment [
 Instrumentation Seminar]
DTSTART:20260203T060000Z
DTEND:20260203T070000Z
DTSTAMP:20260418T033800Z
UID:indico-event-398@events.iiap.res.in
CONTACT:seg@iiap.res.in
DESCRIPTION:Speakers: Bikramjit Basu (CSIR-Central Glass and Ceramic Resea
 rch Institute\, Kolkata)\n\nAbstractHigh-performance space quality optical
  glasses are designed to provide outstanding optical clarity\, high optica
 l homogeneity and precise control of refractive index. These glasses are w
 idely used for precision optical elements such as lenses\, prisms\, window
 s\, attitude control (sun senor star sensor)\, imaging and instrumentation
 . The demand for such high-quality optical glasses are met by few well-kno
 wn global manufacturers in Europe\, Japan\, and the USA. In India\, no com
 mercial manufacturer is engaged towards development of optical glasses. At
  the industrial scale\, such high-quality optical glasses are typically pr
 oduced using continuous tank melting which favours achievement of extremel
 y high optical homogeneity\; a process that is not feasible to adopt under
  laboratory conditions.CSIR-CGCRI\, the only national lab in the area of c
 eramics and glass in India\, is known for contributions in the development
  of critical glass technologies for strategic\, industrial\, and societal 
 applications\, over last seven decades. In line with the Aatmanirbhar Bhar
 at initiative\, CSIR-CGCRI has taken up a challenge to develop five types 
 of flint and crown based optical glasses in collaboration with VSCC ISRO a
 nd LEOS ISRO. The roadmap for development started from initial phase of la
 boratory-scale (50-100 ml) melts to gradually larger batch sizes (500ml to
  5l) meeting the stringent optical properties through compositional optimi
 zation. State-of-the art facility (5l induction heating glass melting faci
 lities of 1450°C and 1650° C) has been created for development cum produ
 ction of optical glasses with stringent optical properties in terms of ref
 ractive index and Abbe number with optical homogeneity of the order of 10-
 5 to 10-6. Notably\, some of the selected samples tested at LEOS\, ISRO ex
 hibited improved homogeneity close to 2×10⁻⁶\, which is a significant
  and challenging achievement. Thus\, CSIR-CGCRI has demonstrated the capab
 ility creating optical glass melting facility and glasses in the H1–H2 h
 omogeneity category\, which is a major step towards promoting national sel
 f-reliance. The quality assessment has been performed using LEOS facility.
  The manufacturing facility and stringent quality assessment have led to t
 he successful maturation of the technology of space-quality optical glasse
 s.\n\nhttps://events.iiap.res.in/event/398/
LOCATION:Auditorium
URL:https://events.iiap.res.in/event/398/
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