This reference on optical imaging techniques covers the field from the basics of the optical microscope to highly advanced techniques such as F rster resonant energy transfer (FRET) and fluorescence lifetime imaging microscopy (FLIM). Using a uniform style and format, it provides an understanding of the underlying principles, so readers can learn the benefits and limitations of each technique described. Topics covered include: optical contrasting techniques, fluorescence and fluorescence microscopes, three-dimensional imaging, the confocal microscope, nonlinear microscopy, advanced fluorescence techniques, and breaking the diffraction limit. Chapters include suggestions for further reading.