Coherent microwave emission without population inversion: A new atomic frequency standard

The description of a new type of frequency standard based on coherent popul ation frapping (CPT) in cesium is given. The phenomenon creates a magnetiza tion oscillating at the hyperfine frequency, Microwave radiation emitted by such a magnetization is detected by means of a microwave cavity. The proce ss takes place without population inversion. Results are given for continuo us and pulsed operation. The possibility of using the CPT coherent microwav e emission as the basis of a frequency standard is analyzed.