Abstract

We show that, by adding a photodiode and a plain glass beam splitter to a commercial green laser pointer, we can obtain a very sensitive self-mixing interferometer capable of detecting minute vibrations down to submicrometer amplitude, typically $\approx\! {13}\;{\rm nm}$ resolution, or make displacement measurements with half-wavelength ($\lambda /{2 = 266}\;{\rm nm}$) count increments.

© 2021 Optical Society of America

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