Note: Measurement speed improvement of microchip Nd:YAG laser feedback interferometer

Abstract

We analyze the measurement speed limit of the quasi-common-path laser feedback interferometer and demonstrate a much improved measurement speed from 100 μm/s to 60 mm/s owing to the optimized system parameters and a novel signal processing method. The performance is experimentally verified by comparing to an Agilent 5529A dual-frequency laser interferometer.

Laser feedback interferometry and applications: a review

“…A research focus of laser feedback technology applied in the displacement measurement field is the heterodyne microchip solid-state laser employing external frequency-shifted feedback. 38,39 As mentioned above, the relaxation oscillation phenomenon in solid-state lasers causes a highly sensitive response as large as 10 6 to the frequency-shifted laser feedback. The schematic diagram is shown in Fig.…”