This book extensively elucidates the techniques and applications of Nd: YAG laser, which has evolved ever since its discovery almost a half century ago at Bell Laboratory in 1964. This technique has been widely incorporated in medicine for therapy and drug management, research analysis and technological applications. This book covers important topics which will be of great assistance to a wide spectrum of readers; these are the new systems and components of semi-organic nonlinear crystal, and applications in material processing like welding, coating, drilling and polishing. Veteran scholars in the field have contributed to the book