PHYSICAL SYSTEM DEVICE FOR CHIP CPT ATOMIC CLOCK

摘要

A physical system device for a chip CPT atomic clock; linearly polarized circular divergent light (12a) emitted by a vertical-cavity surface-emitting laser (VCSEL) device sequentially passes through a first polarization beam splitter (6a), a first λ/4 wave plate (7a), an atomic vapor cavity chip (8) and a second λ/4 wave plate (7b), is reflected by a reflecting device to pass through a lens (10), and is then reflected by a second polarization beam splitter (6b) to sequentially pass through the first λ/4 wave plate (7a), the atomic vapor cavity chip (8) and the second λ/4 wave plate (7b), and is then reflected by the reflecting device to sequentially pass through the lens (10) and the second polarization beam splitter (6b), and is transmitted to a photoelectric detector (11) and converted into a current for output. The device can concentrate atoms at "0-0 energy level", thus enhancing a CPT resonance signal, and improving the signal-to-noise ratio and contrast of the signal; and moreover, integrating a light source and a detector on the same silicon wafer, thus miniaturizing the device.