Metrology Laser Reliability


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I have a couple machines using Teletrac/Axsys 150 circ. pol. interferometer lasers. These seem to be a pretty poor brand , lasting 6 months to 2 years. I have other machines using HP lasers which last decades!.
My laser repair guy has suggested used SP-117 or SP-117A type lasers or new Thorlabs HRS015 ( ) stabilized HeNe lasers (both of which would need a beam expander and change to cir.pol).

Question: How reliable are these lasers? Anyone use them for an extended period?


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First, both wavelengths and power should be calibrated so you know what you have.

Second, based on the description, I would go three months!

Hope this helps.
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