The Loudon quantum theory of light has several key features, including:
The Quantum Theory of Light by Loudon is a comprehensive textbook on the quantum theory of light, covering topics such as:
The complete piece you're looking for is likely:
: Using time-dependent quantum mechanics to explain how light interacts with matter.
If your library does not own the ebook, request an ILL. The library will scan a physical copy and send you a personal-use PDF of the chapters you need—typically within 1 week.
For a history of how Loudon’s work shaped the field of quantum optics, you can read the recent commemorative article in Philosophical Transactions A from the Royal Society.
The historical and theoretical foundation of why light must be quantized.