The fourth volume of this popular Book Series is devoted to optics, lasers and optical sensors, and written by 29 authors from academia and industry from 10 countries: Brazil, China, France, Germany, Greece, Israel, Russia, Serbia, USA and Vietnam. This book ensures that the readers will stay at the cutting edge of the field and get the right and effective start point and road map for the further researches and developments. By this way, they will be able to save more time for productive research activity and eliminate routine work.