CN-122018275-A - Miniaturized rubidium atomic clock

CN122018275ACN 122018275 ACN122018275 ACN 122018275ACN-122018275-A

Abstract

The application relates to the technical field of atomic frequency standards, in particular to a miniaturized rubidium atomic clock, which comprises a light source module, a microwave cavity module, a microwave coupling module and a control module, wherein the light source module, the microwave cavity module and the microwave coupling module are sequentially arranged along a light path, parallel light output by the light source module passes through the microwave cavity module and is received by the microwave coupling module, the microwave coupling module and the microwave cavity module are fixedly arranged through a supporting structure, and the control module is respectively and electrically connected with the light source module, the microwave cavity module and the microwave coupling module. The miniature laser is used as a light source to replace the traditional spectrum lamp, the size and the power consumption of the light source are reduced, the manufacturing and the microwave feeding of the microwave cavity are directly realized by adopting the circuit board process, the physical system size is further reduced, and the miniature rubidium atomic clock has the advantages of low cost, short production period and batch production, and is expected to realize the commercial product of the miniature rubidium atomic clock in mass production.

Inventors

YANG WEI
LIAN JIQING
ZHANG JINHAI
CAI ZHIWEI
ZHANG WENXI
WANG SHIWEI
ZHANG JUN
ZHAO YULONG
WANG DONGJUN

Assignees

兰州空间技术物理研究所

Dates

Publication Date: 20260512
Application Date: 20260227

Claims (7)

1. The utility model provides a miniaturized rubidium atomic clock which characterized in that includes light source module, microwave cavity module, microwave coupling module and control module, wherein: the light source module, the microwave cavity module and the microwave coupling module are sequentially arranged along the light path; The parallel light output by the light source module passes through the microwave cavity module and is received by the microwave coupling module; The microwave coupling module and the microwave cavity module are fixedly arranged through a supporting structure, and the microwave coupling module is positioned at one side of the microwave cavity module, and is arranged in parallel with the microwave cavity module at intervals; the control module is electrically connected with the light source module, the microwave cavity module and the microwave coupling module respectively and is used for providing driving, controlling and signal processing.
2. The miniaturized rubidium atomic clock of claim 1, wherein the light source module comprises a micro laser, a beam expander, and a collimator, wherein: The micro laser is a micro vertical cavity surface emitting laser; And the output light of the micro laser passes through the beam expander and the collimator to form parallel light.
3. The miniaturized rubidium atomic clock of claim 2, wherein the microwave cavity module comprises a microwave resonant cavity, an atomic gas chamber, a magnetic field coil, and a temperature control assembly, wherein: the microwave resonant cavity is manufactured by a printed circuit board; the atomic air chamber is positioned at the center of the microwave resonant cavity; The magnetic field coil is arranged on the top layer and the bottom layer of the microwave resonant cavity circuit board to form a Helmholtz coil; the temperature control assembly includes a thermistor and a heater.
4. The miniaturized rubidium atomic clock of claim 3, wherein the microwave resonant cavity comprises an outer cavity, a dielectric layer and a pole piece structure from outside to inside, wherein: The outer cavity is manufactured by a printed board through hole; the dielectric layer determines the material of the printed board with the corresponding dielectric constant according to the resonant frequency and the structural size; the pole piece structure is a net-shaped structure formed by interconnecting and pressing upper and lower layers of round wires through a circuit board process.
5. The miniaturized rubidium atomic clock of claim 4, wherein the microwave coupling module comprises a microwave coupling coil, a photodetector, and a microwave coupling port, wherein: The microwave coupling coil is designed by adopting a 50 ohm transmission line, one end of the microwave coupling coil is connected with microwave signal input, and the other end of the microwave coupling coil is grounded through a capacitor; the photoelectric detector is arranged at the center of the microwave coupling coil and is used for receiving optical signals transmitted through the atomic gas chamber; the microwave coupling port is made of a miniature radio frequency terminal and is used for being connected with an external microwave signal source.
6. The miniaturized rubidium atomic clock of claim 5, wherein the microwave coupling coil is maintained in concentric alignment with the pole piece structure when assembled, and the photodetector is positioned directly behind the atomic gas cell in the optical path.
7. The miniaturized rubidium atomic clock of claim 6, wherein the control module comprises a laser driving circuit, a microwave frequency synthesizing circuit, a temperature control circuit, a magnetic field control circuit, and a servo circuit.

Description

Miniaturized rubidium atomic clock Technical Field The application relates to the technical field of atomic frequency standards, in particular to a miniaturized rubidium atomic clock. Background The rubidium atomic clock is the atomic clock with the widest application at present, and has wide application in navigation and positioning, communication networks, power systems and the like. With the continuous development of electronic technology, the integration level of various electronic systems is higher and higher, and the volume requirement on commercial atomic clocks is also smaller and smaller. The traditional rubidium atomic clock adopts an electrodeless discharge spectrum lamp as a light source, and the light source can be started only under the condition of larger radio frequency excitation power, and has higher power consumption and large miniaturization difficulty. In addition, the microwave cavity provides a microwave magnetic field required by magnetic resonance transition for the atomic clock, is another core component of the rubidium atomic clock, the traditional rubidium atomic clock uses a microwave resonant cavity processed by metal materials, and through the optimization development for many years, the current volume reaches a few cm 3, but the difficulty of further miniaturization is large, the most important difficulty of restricting the microminiaturization and chip design of the rubidium atomic clock is high, and the mechanical processing period is long, the cost is high, and the large-scale production is not facilitated. Therefore, although the current commercial rubidium atomic clock realizes a miniaturized product, the integration degree is more difficult, and the further development of the rubidium atomic clock is restricted. How to further reduce the volume of the rubidium atomic clock and realize miniature or even chip-level commercial products is an important difficulty faced by the rubidium atomic clock. Disclosure of Invention The application provides a miniaturized rubidium atomic clock, which adopts a micro laser as a light source to replace the traditional spectrum lamp, and has small volume and low cost. The application provides a miniaturized rubidium atomic clock, which comprises a light source module, a microwave cavity module, a microwave coupling module and a control module, wherein the light source module, the microwave cavity module and the microwave coupling module are sequentially arranged along a light path, parallel light output by the light source module passes through the microwave cavity module and is received by the microwave coupling module, the microwave coupling module and the microwave cavity module are fixedly arranged through a supporting structure, the microwave coupling module is positioned at one side of the microwave cavity module, a space is kept between the microwave coupling module and the microwave cavity module, the microwave coupling module is arranged in parallel, and the control module is respectively and electrically connected with the light source module, the microwave cavity module and the microwave coupling module and is used for providing driving, controlling and signal processing. The light source module comprises a micro laser, a beam expander and a collimator, wherein the micro laser is a micro vertical cavity surface emitting laser, and the output light of the micro laser forms parallel light after passing through the beam expander and the collimator. The microwave cavity module comprises a microwave resonant cavity, an atomic air chamber, a magnetic field coil and a temperature control assembly, wherein the microwave resonant cavity is made of a printed circuit board, the atomic air chamber is located at the center of the microwave resonant cavity, the magnetic field coil is arranged on the top layer and the bottom layer of the microwave resonant cavity circuit board to form a Helmholtz coil, and the temperature control assembly comprises a thermistor and a heater. The microwave resonant cavity is sequentially provided with an outer cavity, a dielectric layer and a pole piece structure from outside to inside, wherein the outer cavity is made of printed board through holes, the dielectric layer determines the printed board material with the corresponding dielectric constant according to the resonant frequency and the structural size, and the pole piece structure is a net-shaped structure formed by interconnecting and pressing upper and lower layers of round wires through a circuit board process. The microwave coupling module comprises a microwave coupling coil, a photoelectric detector and a microwave coupling port, wherein the microwave coupling coil is designed by adopting a 50 ohm transmission line, one end of the microwave coupling coil is connected with a microwave signal input, the other end of the microwave coupling coil is grounded through a capacitor, the photoelectric detector is arranged in the center of the microwave coup