Coherent Population Trapping and Intensity Optical Pumping:. on Their Use in Atomic Frequency Standards

The paper summarizes the relative advantages and disadvantages of Coherent Population Trapping (CPT) and Intensity Optical Pumping (IOP) for the implementation of a passive atomic frequency standard. The paper outlines the basic principles common to both CPT and IOP when using laser optical pumping, and makes explicit their similarities and their differences. The paper describes recent experimental results obtained in the same cell on the characteristics of the CPT and IOP ⁸⁷Rb-hyperfme resonance line.