The field of study which deals with the application of optics is referred to as optical engineering. It focuses on the design of optical instruments including lenses, telescopes, microscopes and other equipment that use the properties of light in physics and chemistry. Some of the other devices which use principles from optical engineering are optical sensors and measurement systems, laser, fiber optic communication systems and optical disc systems. Optical engineering metrology is a subfield of optical engineering which utilizes optical methods for the measurement of micro-vibrations with instruments like the laser speckle interferometer. This book explores all the important aspects of optical engineering in the present day scenario. Different approaches, evaluations, methodologies and studies related to this field have been included herein. This textbook is appropriate for students seeking detailed information in this area as well as for experts.