Native signal self-mix interferometer has less than 1 nm noise equivalent displacement

We demonstrate that the native configuration of a self-mixing interferometer attains a minimum detectable displacement of 0.72 nm or lambda/1870 at the laser wavelength of 1310 nm, obtained by the bare laser diode package including a monitor photodiode, observed in the electrical domain by means of an oscilloscope and without any electronic processing of the signal. (C) 2021 Optical Society of America

Automated summary

The study demonstrates that the native configuration of a self-mixing interferometer can achieve a minimum detectable displacement of 0.72 nm at a laser wavelength of 1310 nm, without any electronic processing of the signal.