Field quantization

hi, i studied the field quantization in terms of raising and lowering operators , in its derivation we consider cavity- my question -a) Is field consider to be quantized in cavity only ?
b)how do we link mode of electromagnetic field with harmonic oscillator ?

bhobba
Mentor
hi, i studied the field quantization in terms of raising and lowering operators , in its derivation we consider cavity- my question -a) Is field consider to be quantized in cavity only ?
b)how do we link mode of electromagnetic field with harmonic oscillator ?
You really need to study QFT from the start. If you know basic QM check out the following: