Physical system for chip-scale CPT atomic clock

摘要

A physical system for a chip-scale coherent population trapping (CPT) atomic clock. The physical system includes: a vertical-cavity surface-emitting laser (VCSEL) device, a first polarizing beam splitter, a first λ/4 wave plate, a chip of an atomic vapor cell, a second λ/4 wave plate, a reflection device, a lens, a second polarizing beam splitter, and a photo detector. The first polarizing beam splitter, the first λ/4 wave plate, the chip of the atomic vapor cell, the second λ/4 wave plate, and the reflection device are disposed in sequence. The lens, the second polarizing beam splitter, and the photo detector are disposed in sequence.

主权项

1. A physical system for a chip-scale coherent population trapping (CPT) atomic clock, the system comprising: a vertical-cavity surface-emitting laser (VCSEL) device, a first polarizing beam splitter, a first λ/4 wave plate, a chip of an atomic vapor cell, a second λ/4 wave plate, a reflection device, a lens, a second polarizing beam splitter, and a photo detector;
wherein
the first polarizing beam splitter, the first λ/4 wave plate, the chip of the atomic vapor cell, the second λ/4 wave plate, and the reflection device are disposed in sequence;the lens, the second polarizing beam splitter, and the photo detector are disposed in sequence;a linearly polarized circular divergent beam is sent out by the VCSEL device and goes through the first polarizing beam splitter to produce a first linearly polarized circular divergent beam;the first linearly polarized circular divergent beam goes through the first λ/4 wave plate to produce a circularly polarized circular divergent beam;the circularly polarized circular divergent beam goes through the chip of the atomic vapor cell and the second λ/4 wave plate respectively to produce a second linearly polarized circular divergent beam;the second linearly polarized circular divergent beam is reflected by the reflection device to produce a first linearly polarized reflected circular divergent beam;the first linearly polarized reflected circular divergent beam goes through the lens to produce a first linearly polarized parallel beam;the first linearly polarized parallel beam is reflected by the second polarizing beam splitter to produce a first linearly polarized reflected parallel beam;the first linearly polarized reflected parallel beam is reflected by the first polarizing beam splitter and combined with the first linearly polarized circular divergent beam; andthe first linearly polarized reflected parallel beam after being reflected by the first polarizing beam splitter goes through the first λ/4 wave plate, the chip of the atomic vapor cell, the second λ/4 wave plate, respectively, is reflected by the reflection device, goes through the lens, the second polarizing beam splitter, respectively, and is transmitted to the photo detector and converted into a current output.