Keeping abreast of the latest techniques and applications, this new edition of the standard reference and graduate text on laser spectroscopy has been completely revised and expanded. While the general concept is unchanged, the new edition features a broad array of new material, e.g., frequency doubling in external cavities, reliable cw-parametric oscillators, tunable narrow-band UV sources, more sensitive detection techniques, tunable femtosecond lasers and pulse shaping techniques for realizing coherent control of molecular excitations, frequency combs able to synchronize independent femtosecond lasers, coherent matter waves, and still more applications in chemical analysis, medical diagnostics, and engineering. From reviews of the second edition (1996):"A detailed survey of the essential ideas and facts, which, because of its clarity and utility, is already a classic... It would be hard to imagine a better book at this level addressed to a wide audience." Applied Optics