Hello All, I would like to know optical constants (refractive index and
extinction coefficient) of Corning Pyrex 7740 in the spectrum of 8-14um. I need
them in designing optical filter.
Can anyone help in providing them to me. Date, curves, and  related papers or
websites will all be fine. Thank you.

Best regards
X.Yan
Email: memser@tom.com
State key laboratory of Transducer Technology
Shanghai institute of Microsystem and information technology
Chinese Academy of Science
865 Chang Ning Road,Shanghai, P.R.China, 200050