_Topology in Optics: Tying light in knots (Second Edition)_ provides the background needed to understand a broad range of unexpected phenomenon and developments arising from topological effects in optics. Assuming only a background in physics at the advanced undergraduate level, it requires no prior familiarity with topology.  Revised and expanded with two new chapters, _Topological Photonics_ and _Optical Knots and Links_, this will be an invaluable reference for undergraduate and graduate students as well as researchers and engineers in optics and related areas. KEY FEATURES * The first book to cover in detail the use of topology in optical physics. * Self-contained, covering the necessary background in topology. * At a level understandable to an advanced undergraduate, but covering a range of cutting edge research topics. * Of interest to students and researchers in many areas of physics, optics, engineering, and mathematics.