I am thinking about using a sapphire lightpipe to reduce the effect ot convection currents in a 1000degC interferometer instrument I am designing. I would need a lightpipe around 40mm across (either circular or rectangular 40mm x10mm). How long a lightpipe would be possible to have made? I would need the end faces to be parallel and polished, but slightly tilted to stop reflections affecting my instrument. As I am using polarised light in my experiment is it possible to select a crystal orientation that will not experience birefringence? I assume as the material is a single crystal that the material properties are very homogeneous.
We can supply the sapphire pipes: 40mm dia. x about 100mm long or 40mm x 10mm x about 100mm long / C- plane orientation (0001) +/−0.1 deg up to +/−5 deg. for using polarised light / Both ends polished to 80/50 (scratch/dig) up to 40/20; other surface (cylindrical) is fine ground? / Parallelism about 3 arc min. For better understanding “but slightly tilted”, please, send us the drawing for this part. Please, direct the quantity of the sapphire parts.
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