Budzyń, Grzegorz, Tomasz Podżorny, and Janusz Rzepka. “Intermodal Beat Frequency Stability in a Polarization Stabilized HeNe Laser With an Optical Switch”. Photonics Letters of Poland 6, no. 1 (March 31, 2014): pp. 17–19. Accessed November 20, 2024. http://m.photonics.pl/PLP/index.php/letters/article/view/6-7.