The device which emits light with the help of processes such as optical amplification which is based on the stimulated emission of electromagnetic radiation is termed as a laser. They are classified into high energy lasers and short pulse lasers. They are used in weapons, laser printers, barcode scanners, DNA sequencing instruments, optical disk drives, laser surgery, etc. High energy lasers are used in weapons. The lasers that emit light in the form of optical pulses, and this light is not emitted in a continuous mode are referred as pulsed lasers. This book traces the progress of this field and highlights some of its key concepts and applications. The various advancements in lasers are glanced at and their applications as well as ramifications are looked at in detail. Researchers and students in this field will be assisted by this book.