A simple and low-cost setup for part per billion level frequency stabilization and characterization of red He-Ne laser

This work describes the frequency stabilization of a dual longitudinal mode, red (632.8 nm) He-Ne laser, implemented using a low-cost microcontroller and its performance characterization using a simple interferometric method. Our studies demonstrate that frequency stability up to 3.0 MHz (3$\sigma$, 16 hours) can be achieved using this set up. This simple and low-cost system can serve as an excellent part per billion level frequency reference for several high resolution spectroscopy based applications.Comment: 7 pages, 7 figures Files corresponding to the data presented in this manuscript and supplementary information can be accessed at: https://doi.org/10.5281/zenodo.613969