What are the classic works in the field of optics?

Principles of Optics, co-authored by the great physicists Born and Wolff.

Classic among classics. English version is the best.

A. Arif's quantum electronics. That is, laser physics, semi-classical theory, and we are still using this book as a teaching material.

Scully's quantum optics, the classics of quantum optics.

The classical theory, semi-classical theory and total quantum theory of optics are recommended above. After systematic study, you will reach a certain level.

Of course, Fourier optics and nonlinear optics are extremely important branches. You should also study hard.

There are also many professional books in this field, such as Principles and Applications of Nonlinear Optical Fibers. Read as many original books as possible. The key is to think more and always bring questions.