Senamaw Mequanent Zgeye. “A COMPARATIVE STUDY ON THE COHERENCE AND DIRECTIONALITY OF HELIUM-NEON AND SEMICONDUCTOR LASERS”. Advanced International Journal of Material Science and Engineering (AIJMSE), vol. 1, no. 1, Apr. 2023, pp. 68-83, https://zapjournals.com/Journals/index.php/aijmse/article/view/251.