This book covers the basic theoretical background of electro-optical systems, the terminology used, and their corresponding applications. Among other topics, it includes simple radiometric calculations, issues of target signatures in the infrared (thermal) and visible spectrum, the effect of the atmosphere on optical radiation, a description of simple optical arrangements, an explanation of the main laser systems, the characteristics of various types of photodetectors with their corresponding cooling requirements, issues of digital image processing, electro-optical countermeasures and counter-countermeasures, as well as some applications of millimeter and submillimeter waves.

It is addressed to all those involved in defense and security issues (civilian and military applications), newcomers to the field, and users of electro-optical systems, particularly undergraduate and postgraduate students of engineering, military academies, and armed forces personnel. Additionally, it provides an opportunity for electrical, electronic, and telecommunications engineers to be informed about an important area of technology applications.

The book aims to be a useful aid for all interested parties, with central learning objectives:
- Understanding the basic principles of operation, characteristics, capabilities, and limitations of electro-optical systems.
- Appreciating the importance of these systems in defense and security.
- Assessing the potential future developments of the involved technology.