CN-224203317-U - Multi-channel synchronous laser frequency locking device based on atomic reference

CN224203317UCN 224203317 UCN224203317 UCN 224203317UCN-224203317-U

Abstract

The utility model provides a multichannel synchronous laser frequency locking device based on atomic reference, which comprises an optical frequency locking module, a coupling light array module, a collimation beam expanding lens, an atomic air chamber, a photoelectric detector array module and a dichroic mirror, wherein detection light entering the atomic air chamber passes through the atomic air chamber in parallel and then is emitted to the photoelectric detector array module, a plurality of coupling lights emitted by the coupling light array module enter the dichroic mirror, a plurality of coupling lights reflected by the dichroic mirror enter the opposite direction of the detection light in parallel and pass through the atomic air chamber and then are emitted to the collimation beam expanding lens, and the photoelectric detector array module converts electromagnetic induction transparent spectrum signals in the detection light into electric signals and corrects the frequency of the coupling lights output by the coupling light array module in real time through a closed loop feedback system. The utility model can realize the accurate frequency locking of the multipath coupled light and solves the problem of complex multichannel laser frequency locking structure in the prior art.

Inventors

CHEN XUEHUA
JIA CHUNYANG
LI JIAAO
TIAN ZHIYU
WANG HONGJIA

Assignees

北京科微量子科技有限公司
科微量子科技(湖南)有限公司

Dates

Publication Date: 20260505
Application Date: 20250704

Claims (7)

1. The utility model provides a multichannel synchronous laser frequency locking device based on atomic reference, includes optical frequency locking module and coupling light array module, its characterized in that still includes: The collimating and beam expanding lens is arranged at one side of the optical frequency locking module, and the frequency locking emitted by the optical frequency locking module locks the detection light emitted by the light beam and the detection light emitted by the light beam is incident to the collimating and beam expanding lens; The atomic gas chamber is arranged at one side of the collimation beam expanding lens, and the detection light formed after the beam expansion and collimation of the collimation beam expanding lens is emitted to the atomic gas chamber in parallel; The photoelectric detector array module is arranged on one side of the atomic air chamber, and detection light incident to the atomic air chamber passes through the atomic air chamber in parallel and then is emitted to the photoelectric detector array module; The dichroic mirror is arranged between the atomic gas chamber and the photoelectric detector array module, a plurality of coupling lights emitted by the coupling light array module are incident to the dichroic mirror, and the plurality of coupling lights reflected by the dichroic mirror are parallel incident in the opposite direction of the detection lights and are emitted to the collimation beam expansion group lens after passing through the atomic gas chamber; The photoelectric detector array module converts electromagnetic induction transparent spectrum signals in the detection light into electric signals and corrects the frequency of the coupling light output by the coupling light array module in real time through a closed loop feedback system.
2. The atomic reference-based multichannel synchronous laser frequency locking device as set forth in claim 1, wherein the collimating and beam expanding lens comprises: the pinhole diaphragm is arranged between the optical frequency locking module and the atomic air chamber, and the detection light emitted by the optical frequency locking module is incident to the pinhole diaphragm and passes through a pinhole of the pinhole diaphragm; The first convex lens is arranged between the pinhole diaphragm and the atomic gas chamber, the detection light passing through the pinhole of the pinhole diaphragm is emitted to the first convex lens at a preset first divergence angle, and the detection light formed after being refracted by the first convex lens is parallelly incident into the atomic gas chamber.
3. The atomic reference-based multichannel synchronous laser frequency locking device as set forth in claim 2, wherein the collimating and beam expanding lens further comprises: The second convex lens is arranged between the optical frequency locking module and the pinhole diaphragm, and the detection light emitted by the optical frequency locking module at a preset second divergence angle is emitted to the second convex lens; The third convex lens is arranged between the second convex lens and the pinhole diaphragm, the detection light after being shaped by the second convex lens is emitted to the third convex lens in parallel, is refracted by the third convex lens and converged towards the central axis direction of the third convex lens, is incident into a pinhole of the pinhole diaphragm, forms a focus in the pinhole, and is emitted to the first convex lens at a preset first divergence angle.
4. A multi-channel synchronous laser frequency locking device based on atomic reference as set forth in claim 3, wherein, The mirror surface diameter of the second convex lens or the third convex lens is smaller than that of the first convex lens.
5. The multi-channel synchronous laser frequency locking device based on atomic reference according to claim 1 or 4, wherein the atomic gas chamber comprises: A cesium atom vapor chamber, wherein the cesium atom vapor chamber is arranged inside the atom gas chamber, the detection light passing through the atom gas chamber in parallel and a plurality of coupling lights opposite to each other generate coherent interaction, an electromagnetic induction transparent effect is induced in the cesium atom vapor chamber, after the interaction, the cesium atom vapor chamber emits the detection light to the photoelectric detector array module, Coherent interactions, including: Under the action of detection light which passes through the atomic gas chamber in parallel, cesium atoms filled in the cesium atom vapor chamber carry out energy level transition from a ground state to a first excited state; Under the action of parallel correlation coupling light, cesium atoms carry out energy level transition from a first excited state to a Redberg state, wherein the number of main quanta of the cesium atoms in the Redberg state is greater than or equal to 50.
6. The atomic reference-based multichannel synchronous laser frequency locking device as set forth in claim 5, wherein the photodetector array module comprises: The photoelectric detectors are arranged flush with the detection light action area, detection light emitted by the cesium atom steam chamber is incident on the photoelectric detectors, and the photoelectric detectors synchronously collect electromagnetic induction transparent spectrum signals, convert the electromagnetic induction transparent spectrum signals into multipath electric signals and transmit the multipath electric signals to the coupling light array module.
7. The atomic reference-based multichannel synchronous laser frequency locking device as set forth in claim 1 or 6, wherein the closed-loop feedback system comprises: The plurality of error signal extraction units are respectively connected with the plurality of photoelectric detectors in a communication way, and are used for calculating the peak position offset of the electromagnetic induction transparent spectrum signal in real time and outputting error voltage; The PID control units are respectively connected with the error signal extraction units in a communication way and are used for processing the error voltage and outputting control voltage range data; And the laser frequency real-time correction units are respectively and communicatively connected with the PID control units and are used for adjusting the cavity length of the resonant cavity of the coupled optical semiconductor laser through the PZT piezoelectric ceramics according to the control voltage range data.

Description

Multi-channel synchronous laser frequency locking device based on atomic reference Technical Field The utility model relates to the technical field of lasers, in particular to a multichannel synchronous laser frequency locking device based on atomic reference. Background Compared with the traditional antenna, the electric field measurement technology based on the Redberg atoms has the advantages of high sensitivity, high selectivity, wide spectrum coverage, strong anti-interference performance, high measurement precision and the like. In the electric field measurement system of the reed burg atoms, the laser frequency locking device is a core component for ensuring measurement accuracy. The laser frequency is locked to the reference frequency of the specific energy level transition of the Redberg atoms through an optical feedback control technology, and a stable and accurate frequency reference is provided for atomic excitation. In order to meet the severe requirements of partial discharge positioning and optical fiber long-distance transmission, the current technical route mainly depends on two schemes of high-power lasers or multichannel laser frequency locking. The high power laser scheme employs high power laser outputs in excess of 100mW to enhance atomic excitation efficiency and signal transmission distance. However, the scheme has the obvious defects that 1) noise and energy loss are generated, spontaneous radiation noise of the high-power laser grows exponentially along with power, so that a large amount of optical power cannot be effectively used for atomic excitation, and 2) mode degradation risk is that the semiconductor laser is easy to generate mode jump under high-power operation, so that the laser frequency stability is reduced, and the accuracy of the Redburg atomic excitation is directly affected. The multichannel laser frequency locking scheme is characterized in that a plurality of low-power lasers are integrated, single-path laser enters a Saturated Absorption Spectrum (SAS) unit or an Electromagnetic Induction Transparent (EIT) unit after beam splitting, then a voltage signal is obtained through a photoelectric detector, and a compensation voltage is output to a laser piezoelectric ceramic (PZT) driver, so that laser locking is realized. Although the scheme can alleviate the defects of the high-power laser, higher requirements are put on the frequency synchronization precision (the frequency detection error is controlled within +/-100 kHz) and the dynamic switching speed (sub microsecond level) of each channel, otherwise, multi-channel signal interference noise is caused, and the detection sensitivity is reduced. Meanwhile, the current multichannel laser frequency locking scheme needs to configure an atomic air chamber, a lens group, a detector and other independent optical reference cavity devices for each laser, so that the laser frequency locking structure is complex, the cost is high, the occupied area of the system is large, and the system is huge and is difficult to adapt to the chip quantum equipment. Therefore, how to integrate the laser frequency locking device to improve the frequency synchronization precision and the dynamic switching speed is a technical problem to be solved. Disclosure of Invention The utility model provides a multichannel synchronous laser frequency locking device based on atomic reference, which not only can realize the accurate frequency locking of multipath coupled light by carrying out integrated design on a collimation beam expanding lens, an atomic gas chamber and a photoelectric detector array module, but also solves the problems of complex multichannel laser frequency locking structure, high cost, large system occupation area and difficulty in meeting the requirements of mobile quantum equipment in the prior art. The technical scheme provided by the utility model is as follows: A multichannel synchronous laser frequency locking device based on atomic reference comprises an optical frequency locking module, a coupling light array module, a collimation beam expanding group lens, an atomic gas chamber, a photoelectric detector array module and a dichroic mirror. And the optical frequency locking module provides a frequency locked detection light signal through a saturated absorption peak so as to realize the stability of laser frequency. And the coupling light array module is used for generating a reverse transmission regulation light field, forming an Λ -type energy level structure with the detection light, realizing induction of atomic quantum state coherence and generating an EIT window. The collimating and beam expanding lens is used for expanding the beam diameter of the detection light emitted by the optical frequency locking module, optimizing the beam divergence angle and adapting to an atomic air chamber action area to improve the uniformity of light-atomic interaction. The atomic air chamber is arranged at one side of the collimation beam e