Hi professors, I'm building an interferometer and I need to make adjustments of 0.25 or even smaller resolution. To be specific I need an actuator or something like that to help move 1 of my mirrors by 0.25 um so that 1 bright fringe can shift to the next one. As far as I know normal actuators cannot reach such a resolution; they cannot move that precisely. Is there any way to control an actuator with such a resolution or is there a suitable type of actuators that may help? Thank you.
Please google for 'piezo actuator' or 'linear piezo actuator'.
Their spatial resolution is in the low nm region.
Suppliers for your region will propably also pop up.
Good luck.
I remember Raith 150 ebeam lithography system has a very precise laser-interferometer-controlled stage with a moving accuracy of tens of manometer. If you have similar parts, moving 250 nm should not be a problem.
You may have a look here:
http://www.ndt.net/events/ECNDT2014/app/content/Paper/71_Czarnecki.pdf
You can use some ideas for your application.
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