Description: This combines a High Stability Plane Mirror Interferometer (NOT a Linear Interferometer) with an Angular Interferometer in a single module. It is labeled Prototype P003. I wonder if something like it ever went into production. Perhaps it was intended for a specific customer. A Web search for "Linear/Angular Displacement Interferometer" will turn up some patents and an SPIE paper from someone at Zygo. I can provide a copy of the paper if you do not have journal access. The Zygo version is shown in the diagram. Tracing out the beam paths accounting for direction and polarization is left as an exercise for the conscientious student. ;-) The input is a 2 or 3 mm free space beam; the circular object sitting next to the metal block appears to be a mirror to aid in alignment. Bot outputs are fiber-coupled using ST connectors. When I found this I thought it was going to be something really cool. But in essence, it's just a pair of HSPMIs in series with REF and MEAS swapped between them so the direction polarity is flipped. The first one acts as a normal HSPMI for displacement. The second one does the same with but with the opposite polarity, displacement is canceled and only anglular changes will be detected. There are basically two sets of identical HSPMI beam paths inside. The top one in the diagram is for displacement. Part of the beam exiting goes to optical receiver for displacement and the rest is split off and re-enters the PBS but has been rotated 90 degrees by a Half WavePlate (HWP) so the functions of the REF and MEAS beams are swapped. Rather than any angular motion cancelling out, it adds. That's it! Except that the packaging IS really cool - a 2-3/8x2-1/8x5/8 inch milled stainless steel block with everything glued together inside. Repair is probably not an option! This could also be used as a displacement/differential interferometer, The Angle output would be the difference in position of a pair of planar mirrors that move with respect to each-other without changing orientation. Essentially it would measure Displacement 1 and Displacement 2-1. It is in very good to excellent condition except that the threads on one of the fiber are either damaged or machined incorrectly, but this does not affect functionality. The only reason to spend what I'm asking would be if you are a collector of Zygo interferometer memorabilia. But make me a reasonable offer and I will consider it. Thanks for looking, --- sam
Price: 375 USD
Location: Bala Cynwyd, Pennsylvania
End Time: 2025-01-01T18:10:45.000Z
Shipping Cost: N/A USD
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All returns accepted: ReturnsNotAccepted
Type: Optics
MPN: Zygo LDA Interferometer Prototype
