Kanskar, Manoj: 'Diode laser: fundamentals and improving the brightness' (Materials, Circuits and Devices, 2019), 'Advances in High-Power Fiber and Diode Laser Engineering', Chap. 1, pp. 1-36, DOI: 10.1049/PBCS054E_ch1
IET Digital Library, https://digital-library.theiet.org/;jsessionid=109m02l1fclwo.x-iet-live-01content/books/10.1049/pbcs054e_ch1