Significant advances have occurred in the field since the previous edition, including advances in light squeezing, single photon optics, phase conjugation, and laser technology. The laser is essentially responsible for nonlinear effects and is extensively used in all branches of science, industry, and medicine.

Myron Wyn Evans was a Welsh chemist and physicist who helped develop the Einstein-Cartan-Evans theory or ECE theory, which claimed to unify general relativity, quantum mechanics and electromagnetism.