“…The fundamental advantage of semiconductor lasers, as compared to most other laser types, consists in operation using direct current injection to provide population inversion. In effect, a high electrical to the optical power conversion efficiency of up to 75% is reached, as well as high reliability, compactness, and low manufacturing costs (Sobiesierski and Smowton, 2016). A semiconductor laser is very compact, typically, the size of an active laser part is only 100 μm × 1,000 μm × 100 μm (Razeghi, 2010).…”