Transforming a green laser pointer in a self-mixing interferometer capable of submicrometer vibration sensing

摘要

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 approximate to 13 nm resolution, or make displacement measurements with half-wavelength (lambda/2 = 266 nm) count increments. (C) 2021 Optical Society of America