Optical Epoxy with Refractive Index of 1.0008
Optical Epoxy with Refractive Index of 1.0008
(OP)
Does anyone know if an optical epoxy exists with a refractive index as close to air as possible? I'm not even sure an epoxy like this exists, but maybe someone out there knows better. Thanks!





RE: Optical Epoxy with Refractive Index of 1.0008
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: Optical Epoxy with Refractive Index of 1.0008
RE: Optical Epoxy with Refractive Index of 1.0008
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: Optical Epoxy with Refractive Index of 1.0008
RE: Optical Epoxy with Refractive Index of 1.0008
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: Optical Epoxy with Refractive Index of 1.0008
I would assume that if the system is sensitive to the small gap then you will need to fixture the lenses anyway which gets back to IRStuff's question of why not use a spacer?
If you use an adhesive (or urethane, etc) and you know the refractive index can you adjust your data? In other words just verify the error you expect is the error you get? Is this a single wavelength application; are you trying to image something, etc? That could make difference also.
Harold
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RE: Optical Epoxy with Refractive Index of 1.0008
RE: Optical Epoxy with Refractive Index of 1.0008
I boldly assert that there are no solid adhesives with the very low index you seek. Only some gases will match.
Controlling the thickness of any adhesive is dificult and VERY difficult to use if you must control layers to be less than 0.0002 inches, even with thin epoxies that will flow between clamped glass surfaces or spaces that might be cosidered. The capillary action of the fluid can generate significant forces to separate the parts.
RE: Optical Epoxy with Refractive Index of 1.0008
RE: Optical Epoxy with Refractive Index of 1.0008
You wont find a solid with an index close to air.