"Fundamentals of Semiconductor Lasers is a clear and instructive book for advanced undergraduate or graduate students who will become the next generation of laser specialists, and it is a good update for professional physicists, engineers, and researchers in quantum electronics and laser processing. The chapters are largely independent of one another, and a reader who is interested in only one topic may be satisfied by reading all or parts of the relevant chapter without reading the rest of the book. Well written, with many useful figures, formulas, and examples of calculations, Numai's book is a good guide in the field. " Industrial Physicist