A descriptive account based on semiconductor laser diodes has been presented in this book. It presents recent advances and research in the fast growing field of semiconductor laser diode technology and applications. Prominent researchers and experts from all over the world have made valuable contributions in this book. The book provides detailed discussions on optimization of semiconductor laser diode parameters for extensive applications across various fields. It aims to assist physicists, scientists, engineers and technologists in their research and academic activities associated with the field of semiconductor laser diodes.