I am interested about the index of refraction of polyethylene and polypropylene at wavelengths around 178nm. Does anybody know where can I find this data?
Thanks a lot,
This site (http://mst-online.nsu.edu/mst/electronic/electronic3.htm) contains material reproduced from the book Engineering Materials Technology which lists the index of refraction as 1.49 for polypropylene and 1.51 for polyethylene. No wavelengths are specified.
This article (http://www.opticsinfobase.org/abstract.cfm?uri=ao-42-3-592) gives the index of refraction of polypropylene as "1.492(15) for the wavelengths between 118.834 and 251.140 μm, for a polypropylene film of 12.71(2)-μm thickness and 0.9049(7) g/cm3 density." Unfortunately this wavelength range is larger than the 178nm which you are interested in.
This site (http://www.filmetrics.com/refractive-index-database/Polyethylene/PE-Polyethene) allows the download of a .txt file which gives the refraction index of polyethylene over various wavelengths.
I checked the book Handbook of Optics which we have on-site, but polypropylene and polyethylene were not listed in the refractive index table.
These resources are what I was able to find with a quick online search. I'm sure a more thorough search of optical and thermal databases would give you more data.
Ian WilliamsLinear Applications EngineerPrecision Analog and Sensing Products
Thank you for your detailed answer. I am deeply sorry for my delayed response.
It seems that it is not easy to find information about polypropylene and polyethylene in the 180nm region. I think maybe polypropylene and polyethylene are totally absorbing in this wavelength.
Actually, for my needs, I am not limited to polypropylene or polyethylene. I need a high hydrogen contained material with index of refraction below 1.5 in the 180nm region. Maybe I should use Ethylene tetrafluoroethylene (ETFE) or kapton (http://www2.dupont.com/Photovoltaics/en_US/assets/downloads/pdf/OptPropCPVMatls-Slides.pdf ). Do you know about other possible materials?
Thank you very much for your help,sorry again for my delayed response,
It looks like ETFE or kapton would meet your < 1.5 index of refraction at 180nm requirement, but the document did not provide the IR transmission characteristic over the wavelength range of 4000nm to 8000nm which the TMP006 measures.
Unfortunately I do not have any other knowledge of materials which will meet your index of refraction requirements.
Thank you very much for your kind help.
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