This book reviews past, present, and emerging optical laser-based technologies for the detection of explosives. Each chapter is authored by a leading expert on the respective technology, and is structured to offer historical perspective, address current advantages and challenges, and discuss novel research and applications. With the ultimate goal of aiding military and security forces in increasing speed and accuracy of explosive detection and identification, the text covers terahertz, laser-induced breakdown, ultrafast, cavity ringdown, Raman, and reflectance spectroscopy, photodissociation laser-induced fluorescence, hyperspectral imaging, and more.