Enjoy some more behind the scenes footage. This time inside the Lunt Optics Shop.
The Lap:
Lunt mixes a proprietary blend of Gugolz pitch for the precision polishing of our Etalon plates via our Continuous Polishing process. The pitch being poured serves as the base for the polishing process. The pitch lap will be scored into a triangular looking pattern using a metal comb by hand. The lap is actually quite firm but will move/flow at an optical level over a period of about 24 hours, generally going from a few fringes Convex to a few fringes Concave depending on the position of the Counterweight that will be continuously conditioning the lap. The counterweight is moved to the outer portion of the lap to push the lap Concave, the counterweight is then moved in to to move the lap back to the Convex shape.
The etalon plates will be polished in rotating rings in snug fixtures face down on the lap while a polishing compound is continuously mixed and dripped onto the lap.
The continuous polishing process is a slow process. In general it will take approximately 2 days to finish an etalon surface to the 1/40th wave specification. The back surface of the etalon is polished to better than 1/8th wave. That process takes about a day.
There is so much more to learn about this process. Check out the entire blog on our website at: luntsolarsyste...
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