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

Abstract

The utility model provides a multichannel synchronous laser frequency locking device based on atomic reference. The multichannel synchronous laser frequency locking device comprises an optical frequency locking module, a coupling light array module, a collimating and beam expanding group lens, an atomic gas chamber, a photoelectric detector array module and a dichroscope, detection light entering the atomic gas chamber parallelly penetrates through the atomic gas chamber and then is emitted to the photoelectric detector array module, multiple beams of coupling light emitted by the coupling light array module enter the dichroscope, and the multiple beams of coupling light reflected by the dichroscope parallelly enter the opposite direction of the detection light, penetrate through the atomic gas chamber and then are emitted to the collimation and beam expanding group lens. And the photoelectric detector array module converts an electromagnetic induction transparent spectrum signal in the detection light into an electric signal and corrects the frequency of the coupling light output by the coupling light array module in real time through a closed-loop feedback system. According to the utility model, accurate frequency locking of multipath coupling light can be realized, and the problem of complex multichannel laser frequency locking structure in the prior art is solved.

Description

Technical Field

[0001] This utility model relates to the field of laser technology, specifically to a multi-channel synchronous laser frequency locking device based on atomic reference. Background Technology

[0002] Electric field measurement technology based on Rydberg atoms offers advantages over traditional antennas, including high sensitivity, high selectivity, wide spectral coverage, strong anti-interference capabilities, and high measurement accuracy. In Rydberg atom electric field measurement systems, the laser frequency-locking device is the core component ensuring measurement accuracy. It uses optical feedback control technology to lock the laser frequency to the reference frequency of specific energy level transitions in Rydberg atoms, providing a stable and accurate frequency reference for atomic excitation. To meet the stringent requirements of partial discharge localization and long-distance fiber optic transmission, current technologies primarily rely on either high-power lasers or multi-channel laser frequency-locking schemes.

[0003] High-power laser solutions employ high-power laser output exceeding 100mW to enhance atomic excitation efficiency and signal transmission distance. However, this approach has significant drawbacks: 1) Noise and energy loss: The spontaneous emission noise of high-power lasers increases exponentially with power, resulting in a large amount of optical power being unusable for atomic excitation; 2) Mode degradation risk: Semiconductor lasers are prone to mode switching under high-power operation, leading to decreased laser frequency stability and directly affecting the accuracy of Rydberg atomic excitation.

[0004] Multi-channel laser frequency locking schemes integrate multiple low-power lasers. A single laser beam is split and fed into a saturated absorption spectroscopy (SAS) unit or an electromagnetically induced transparency (EIT) unit. A voltage signal is then acquired via a photodetector, and a compensation voltage is output to the laser's piezoelectric ceramic (PZT) driver, thus achieving laser locking. While this scheme alleviates the shortcomings of high-power lasers, it places higher demands on the frequency synchronization accuracy of each channel (frequency detection error must be controlled within ±100kHz) and the dynamic switching speed (sub-microsecond level). Otherwise, interference noise from multiple channels will occur, reducing detection sensitivity. Furthermore, current multi-channel laser frequency locking schemes require independent optical reference cavity devices such as atomic gas cells, lens groups, and detectors for each laser beam. This not only results in a complex and costly laser frequency locking structure but also a large system footprint, making it difficult to adapt to chip-based quantum devices. Therefore, how to integrate the laser frequency locking device to improve frequency synchronization accuracy and dynamic switching speed is a technical problem that needs to be solved. Summary of the Invention

[0005] This invention provides a multi-channel synchronous laser frequency locking device based on atomic reference. By integrating the collimating beam expander, atomic gas cell, and photodetector array module, it can not only achieve precise frequency locking of multi-channel coupled light, but also solve the problems of complex structure, high cost, large system footprint, and difficulty in meeting the needs of mobile quantum devices in the existing multi-channel laser frequency locking technology.

[0006] The technical solution provided by this utility model is as follows:

[0007] A multi-channel synchronous laser frequency locking device based on atomic reference includes an optical frequency locking module, a coupling light array module, a collimating beam expander lens, an atomic gas cell, a photodetector array module, and a dichroic mirror.

[0008] The optical frequency-locking module provides a frequency-locked probe light signal through the saturated absorption peak, thereby achieving the stability of the laser frequency.

[0009] The coupled optical array module is used to generate a reverse-propagating control optical field, which forms a Λ-type energy level structure with the probe light to achieve induced atomic quantum state coherence and generate an EIT window.

[0010] The collimating beam expander is positioned on one side of the optical frequency-locking module. The probe light emitted from the optical frequency-locking module, with its frequency locked and beam diverging, is incident on the collimating beam expander. The collimating beam expander is used to expand the beam diameter of the probe light emitted from the optical frequency-locking module, while optimizing the beam divergence angle. It can also be used to adapt to the atomic gas cell interaction region and improve the uniformity of light-atom interaction.

[0011] The atomic gas chamber is located on one side of the collimating beam expander. The probe light formed after being expanded and collimated by the collimating beam expander is emitted parallel to the atomic gas chamber. The atomic gas chamber is used to provide cesium atom vapor medium, which generates a quantum coherence effect under the action of the probe light and the coupling light.

[0012] The photodetector array module is located on one side of the atomic gas cell. The probe light incident on the atomic gas cell passes parallel through the atomic gas cell and then exits to the photodetector array module. The photodetector array module is used to convert the optical EIT transmission spectrum signal into an electrical signal, supports parallel data acquisition of multiple channels, and realizes synchronous extraction of multi-channel frequency locking error signals.

[0013] A dichroic mirror is positioned between the atomic gas cell and the photodetector array module. Multiple coupled beams emitted from the coupled light array module are incident on the dichroic mirror. After being reflected by the dichroic mirror, the multiple coupled beams are incident parallel to the probe beam in the opposite direction and pass through the atomic gas cell before exiting to the collimating and expanding beam group mirror. The dichroic mirror is used to reflect coupled light of a specific wavelength and transmit probe light of a specific wavelength, thereby realizing the spatial beam combining and reverse transmission control of dual-wavelength beams.

[0014] The photodetector array module converts the electromagnetically induced transparent spectral signal in the probe light into an electrical signal and corrects the frequency of the coupled light output by the coupled light array module in real time through a closed-loop feedback system.

[0015] Preferably, the collimating and expanding lens group includes:

[0016] The pinhole aperture is positioned between the optical frequency-locking module and the atomic gas cell. The probe light emitted from the optical frequency-locking module is incident on the pinhole aperture and passes through the pinhole of the pinhole aperture. The pinhole aperture is used to filter out high-order mode stray light in the probe light path, which greatly improves the cleanliness of the beam, reduces background noise, and ensures frequency-locking accuracy.

[0017] The first convex lens is positioned between the pinhole aperture and the atomic gas chamber. The probe light passing through the pinhole of the pinhole aperture is emitted to the first convex lens at a preset first divergence angle. After being refracted by the first convex lens, the probe light is emitted parallel to the atomic gas chamber.

[0018] Preferably, the collimating and expanding lens group further includes:

[0019] The second convex lens is disposed between the optical frequency-locking module and the pinhole aperture. The probe light emitted by the optical frequency-locking module at a preset second divergence angle is emitted to the second convex lens. The second convex lens is used to convert the divergent beam emitted by the optical frequency-locking module into a parallel beam.

[0020] The third convex lens is positioned between the second convex lens and the pinhole aperture. The probe light, shaped by the second convex lens, is emitted parallel to the third convex lens. After being refracted by the third convex lens, it converges towards the central axis of the third convex lens, enters the pinhole of the pinhole aperture, and forms a focal point within the pinhole. The probe light then exits to the first convex lens at a preset first divergence angle. The third convex lens is used to magnify the beam diameter of the probe light and maintain its parallelism.

[0021] Preferably, the mirror diameter of the second or third convex lens is smaller than that of the first convex lens.

[0022] This invention optimizes the collimation of the probe light beam and suppresses stray light through a collimating and expanding beam array, thereby obtaining a high signal-to-noise ratio probe light spectrum, with an EIT spectrum signal-to-noise ratio improvement of ≥20dB.

[0023] Preferably, the atomic gas chamber includes:

[0024] The cesium atom vapor chamber is located inside the atomic gas chamber. The probe light passing parallel through the atomic gas chamber interacts coherently with the multiple beams of coupled light that are refracted in the opposite direction, inducing an electromagnetically induced transparency effect in the cesium atom vapor chamber. After the interaction, the probe light emitted from the cesium atom vapor chamber is sent to the photodetector array module.

[0025] Coherent interactions include:

[0026] Under the action of the probe light passing parallel through the atomic vapor cell, the cesium atoms filled in the cesium atom vapor cell undergo energy level transitions from the ground state to the first excited state;

[0027] Under the action of parallel-in-phase coupled light, cesium atoms undergo energy level transitions from the first excited state to the Rydberg state, wherein the principal quantum number of cesium atoms in the Rydberg state is greater than or equal to 50.

[0028] Preferably, the photodetector array module includes:

[0029] Multiple photodetectors are arranged flush with the detection light area. The detection light emitted from the cesium atom vapor chamber is incident on the multiple photodetectors. The multiple photodetectors synchronously collect electromagnetically induced transparent spectral signals and convert them into multiple electrical signals, which are then sent to the coupling light array module.

[0030] This invention forms multiple optical channels by correspondingly connecting multiple photodetectors with multiple coupled optical semiconductor lasers in a coupled optical array module. The frequency synchronization locking of multiple optical channels is achieved through a closed-loop feedback system, eliminating inter-channel delay errors.

[0031] Preferably, the closed-loop feedback system includes:

[0032] Multiple error signal extraction units are communicatively connected to multiple photodetectors to calculate the peak position shift of the electromagnetically induced transparent spectral signal in real time and output the error voltage.

[0033] Multiple PID control units are communicatively connected to multiple error signal extraction units to process error voltages and output control voltage range data.

[0034] Multiple laser frequency real-time correction units are connected to multiple PID control units respectively, and are used to adjust the resonant cavity length of the coupled optical semiconductor laser through PZT piezoelectric ceramics according to the control voltage range data.

[0035] This invention achieves synchronous frequency locking of multi-channel lasers through the following steps: First, the probe light undergoes preliminary frequency locking using saturable absorption spectroscopy. Then, the locked probe light is expanded by a collimating and beam-expanding lens group to improve beam quality and adapt to subsequent optical path requirements. Next, the expanded probe light interacts with the array-type coupling light in a reverse transmission manner and enters a photodetector array, thereby obtaining a high signal-to-noise ratio electromagnetic induced transparency (EIT) spectrum. Finally, based on this EIT spectral signal, precise frequency locking of the multi-channel coupling light is achieved through a closed-loop feedback system. This integrated design not only simplifies the complex structure of traditional multi-channel frequency locking but also significantly improves the system's anti-interference capability and frequency locking accuracy through the high-sensitivity detection of Rydberg atoms.

[0036] The technical effects of this utility model are as follows:

[0037] The multi-channel synchronous laser frequency locking device of this invention expands the probe beam using a collimating beam expander, uses a single atom gas cell as a common frequency reference, and uses a photodetector array module to detect electromagnetically induced transparency (EIT) spectral signals of multiple probe beams. This breaks through the limitations of traditional single-channel frequency locking and achieves parallel frequency locking of multiple lasers. It solves the problems of complex multi-channel laser frequency locking structures and the inability of single-channel architecture to achieve synchronous locking of multiple laser frequencies in existing technologies.

[0038] This invention uses miniaturized Rydberg atom sensing units such as collimating beam expander mirrors, single atom gas cells, and photodetector array modules to support direct coupling of fiber arrays. The system footprint is reduced by more than 60%, and the total optical path length is compressed to less than 0.5m, solving the problem of large system footprint that makes it difficult to meet the requirements of mobile quantum devices.

[0039] This invention uses collimating and expanding lenses to filter out higher-order transverse mode light, increasing the EIT signal-to-noise ratio from 20dB to a range greater than or equal to 43dB, and compressing the error to a range less than 1kHz. This solves the problem of low EIT signal-to-noise ratio, which leads to frequency detection errors of ±300kHz. This directly reflects the insufficient frequency locking accuracy of existing multi-channel laser frequency locking devices, and their inability to meet the stability requirements of scenarios such as atomic clocks.

[0040] This invention replaces the open-loop control in the prior art with a real-time closed-loop feedback system, thereby reducing frequency drift error by 90%. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of a multi-channel synchronous laser frequency locking device based on atomic reference according to an embodiment of the present invention. In the figure, 1-second convex lens, 2-second convex lens, 3-pinhole aperture, 4-first convex lens, 5-dichroic mirror. Detailed Implementation

[0042] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0043] As attached Figure 1 As shown, this utility model embodiment provides a multi-channel synchronous laser frequency locking device based on atomic reference, including an optical frequency locking module, a coupling light array module, a collimating beam expander group mirror, an atomic gas cell, a photodetector array module, and a dichroic mirror 5.

[0044] The optical frequency-locking module is used to lock the frequency using saturated absorption spectroscopy (SAS) technology and output frequency-stable probe light to the collimating beam expander lens.

[0045] A collimating and beam-expanding lens assembly is located to the right of the optical frequency-locking module. The frequency-locked and diverging probe light emitted from the optical frequency-locking module is incident on the collimating and beam-expanding lens assembly. The frequency-locked probe light is then expanded and collimated by the collimating and beam-expanding lens assembly, improving the parallelism and spot size of the probe light beam to meet subsequent multi-channel optical path requirements. In this embodiment, the collimating and beam-expanding lens assembly includes a second convex lens 1, a second convex lens 2, a pinhole aperture 3, and a first convex lens 4. The probe light emitted from the optical frequency-locking module at a preset second divergence angle is emitted to the second convex lens 1. After being shaped by the second convex lens 1, the probe light is emitted parallel to the second convex lens 2. It is refracted by the second convex lens 2 and converges towards the central axis of the second convex lens 2, entering the pinhole of the pinhole aperture 3. After passing through the pinhole, it is emitted at a preset first divergence angle to the first convex lens 4. The probe light formed after being refracted by the first convex lens 4 is emitted parallel to the atomic gas chamber.

[0046] During the collimation and beam expansion of the probe light, a second divergence angle is preset, preferably 5 mrad. The focal length of the second convex lens 1 is smaller than that of the second convex lens 2. The focal length of the second convex lens 1 is preferably 30 mm, and the focal length of the second convex lens 2 is preferably 60 mm. The second convex lens 1 and the second convex lens 2 are used for the initial collimation of the probe light, and the output characteristic is that the beam diameter is increased to twice the original beam diameter after initial collimation. The pinhole aperture 3 is mainly used to filter out high-order transverse mode stray light and block non-parallel beams. The pinhole is located at the focal point of the second convex lens 2. When performing pinhole filtering on the probe light, the pinhole aperture is preferably 0.5 mm, and the output characteristic is that the Gaussian mode has high purity. At 95%; the light beam after the pinhole is incident on the first convex lens 4, wherein the focal length of the first convex lens 4 is greater than the focal length of the second convex lens 1 or the second convex lens 2, and the focal length of the first convex lens 4 is preferably 120mm. The first convex lens 4 further expands the initially collimated light by a magnification of 2 times, and optimizes the divergence angle to less than 0.1mrad. Finally, after the beam is expanded by the first convex lens 4, the total diameter of the output probe light beam is 4 times the original beam diameter. In summary, by collimating and expanding the probe light through the collimating and expanding lens group in this embodiment, the diameter of the probe light beam can be increased to more than 4 times, and the divergence angle can be improved to less than 0.1mrad, thereby matching the atomic gas cell and improving the EIT signal-to-noise ratio.

[0047] An atomic gas chamber is positioned on one side of the collimating beam expander. The probe light, expanded and collimated by the collimating beam expander, is emitted parallel to the atomic gas chamber. The atomic gas chamber includes a cesium atom vapor chamber, which is located inside the atomic gas chamber. The probe light passing parallel to the atomic gas chamber coherently interacts with multiple beams of coupled light emitted in the opposite direction. This coherent interaction occurs as follows: under the action of the probe light with a wavelength greater than or equal to 852.00 nm passing parallel to the atomic gas chamber, the cesium atoms filling the cesium atom vapor chamber undergo energy level transitions from the ground state to the first excited state; under the action of the coupled light emitted in the opposite direction with a wavelength greater than or equal to 509.00 nm, the cesium atoms undergo energy level transitions from the first excited state to the Rydberg state, where the principal quantum number of the cesium atom in the Rydberg state is greater than or equal to 50. This induces an electromagnetically induced transparency effect in the cesium atom vapor chamber. After the interaction, the probe light emitted from the cesium atom vapor chamber is sent to the photodetector array module.

[0048] A photodetector array module is positioned on one side of the atomic gas chamber. The probe light incident on the atomic gas chamber passes parallel to the atomic gas chamber and exits to the photodetector array module. The photodetector array module includes multiple photodetectors, preferably 2*2 in this embodiment. Four photodetectors are arranged flush with the area of ​​action of the probe light. The probe light emitted from the cesium atomic vapor chamber is incident on the four photodetectors. The four photodetectors synchronously collect electromagnetically induced transparent spectral signals and convert them into four electrical signals, which are then sent to the coupling light array module.

[0049] Dichroic mirror 5 is positioned between the atomic gas cell and the photodetector array module. Multiple beams of coupled light emitted from the coupled light array module are incident on dichroic mirror 5. After being reflected by dichroic mirror 5, the multiple beams of coupled light are incident parallel to the detector light in the opposite direction and pass through the atomic gas cell before exiting to the collimating beam expander group mirror.

[0050] The photodetector array module converts the electromagnetically induced transparency spectral signal in the probe light into an electrical signal and corrects the frequency of the coupled light output by the coupled light array module in real time through a closed-loop feedback system. Preferably, the closed-loop feedback system includes multiple error signal extraction units, multiple PID control units, and multiple laser frequency real-time correction units. In this embodiment, there are preferably four error signal extraction units, each of which is communicatively connected to the photodetector and is used to calculate the peak position shift of the electromagnetically induced transparency spectral signal in real time and output an error voltage. There are preferably four PID control units, each of which is communicatively connected to the four error signal extraction units and is used to process the error voltage and output control voltage range data. There are preferably four laser frequency real-time correction units, each of which is communicatively connected to the four PID control units and is used to adjust the resonant cavity length of the coupled light semiconductor laser through PZT piezoelectric ceramics according to the control voltage range data.

[0051] This utility model embodiment also provides a multi-channel synchronous laser frequency locking method applied to the above-mentioned multi-channel synchronous laser frequency locking device, including the following steps:

[0052] S01. The optical frequency-locking module uses saturated absorption spectroscopy (SAS) technology to lock the frequency of the probe light output from the probe light semiconductor laser, and then outputs a probe light with a stable frequency to the collimating beam expander lens.

[0053] S02. The probe light, after being shaped by the second convex lens in the collimating and expanding beam group, is emitted parallel to the third convex lens. Then, it is refracted by the third convex lens and converges towards the central axis of the third convex lens. It enters the pinhole of the pinhole aperture, passes through the pinhole, and exits to the first convex lens at a preset first divergence angle. The probe light formed after being refracted by the first convex lens is emitted parallel to the atomic gas chamber.

[0054] S03. Multiple beams of coupled light emitted from the coupled light array module are incident on the dichroic mirror, and after being reflected by the dichroic mirror, the multiple beams of coupled light are incident on the atomic gas cell in the opposite direction to the probe light.

[0055] S04. The probe light passing parallel through the atomic gas cell interacts coherently with the multi-beam coupled light emitted in the opposite direction, inducing an electromagnetically induced transparency effect in the cesium atomic vapor cell. After the interaction, the probe light emitted from the atomic gas cell is sent to the photodetector array module.

[0056] S05. The four photodetectors in the photodetector array module synchronously acquire electromagnetically induced transparent spectral signals and convert them into four electrical signals, which are then sent to the coupling optical array module through a closed-loop feedback system.

[0057] This embodiment of the invention first uses an optical frequency-locking module to perform preliminary frequency locking of the probe light using saturated absorption spectroscopy. The locked probe light is then expanded by a collimating and beam-expanding lens group to improve beam quality and adapt to subsequent optical path requirements. Then, the expanded probe light interacts with the array-type coupling light in a reverse transmission manner and enters the photodetector array, thereby obtaining a high signal-to-noise ratio electromagnetic induced transparency (EIT) spectrum. Finally, based on the EIT spectral signal, a closed-loop feedback system is used to achieve precise frequency locking of the multi-channel coupling light. This integrated design not only simplifies the complex structure of traditional multi-channel frequency locking but also significantly improves the system's anti-interference capability and frequency locking accuracy through the high-sensitivity detection of Rydberg atoms.

Claims

1. A multi-channel synchronous laser frequency locking device based on atomic reference, comprising an optical frequency locking module and a coupling optical array module, characterized in that, It also includes: A collimating beam expander is disposed on one side of an optical frequency-locking module. The probe light emitted from the optical frequency-locking module, which is frequency-locked and beam-divergent, is incident on the collimating beam expander. An atomic gas chamber is located on one side of the collimating and beam-expanding lens group. The probe light formed after being expanded and collimated by the collimating and beam-expanding lens group is emitted parallel to the atomic gas chamber. A photodetector array module is disposed on one side of the atomic gas chamber. The probe light incident on the atomic gas chamber passes parallel through the atomic gas chamber and then exits to the photodetector array module. The dichroic mirror is positioned between the atomic gas cell and the photodetector array module. Multiple beams of coupled light emitted from the coupled light array module are incident on the dichroic mirror. After being reflected by the dichroic mirror, the multiple beams of coupled light are incident parallel to the detector light in the opposite direction and pass through the atomic gas cell before exiting to the collimating beam expander group mirror. The photodetector array module converts the electromagnetically induced transparent spectral signal in the probe light into an electrical signal and corrects the frequency of the coupled light output by the coupled light array module in real time through a closed-loop feedback system.

2. The multi-channel synchronous laser frequency locking device based on atomic reference as described in claim 1, characterized in that, The collimating and beam-expanding lens group includes: A pinhole aperture is provided between the optical frequency-locking module and the atomic gas cell. The probe light emitted from the optical frequency-locking module is incident on the pinhole aperture and passes through the pinhole of the pinhole aperture. The first convex lens is disposed between the pinhole aperture and the atomic gas chamber. The probe light passing through the pinhole of the pinhole aperture is emitted to the first convex lens at a preset first divergence angle. After being refracted by the first convex lens, the probe light is emitted parallel to the atomic gas chamber.

3. The multi-channel synchronous laser frequency locking device based on atomic reference as described in claim 2, characterized in that, The collimating and beam-expanding lens group also includes: The second convex lens is disposed between the optical frequency locking module and the pinhole aperture. The probe 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 disposed between the second convex lens and the pinhole aperture. The probe light, after being shaped by the second convex lens, is emitted parallel to the third convex lens. After being refracted by the third convex lens, it converges towards the central axis of the third convex lens, enters the pinhole of the pinhole aperture, and forms a focal point within the pinhole. The probe light then exits to the first convex lens at a preset first divergence angle.

4. The multi-channel synchronous laser frequency locking device based on atomic reference as described in claim 3, characterized in that, The mirror diameter of the second or third convex lens is smaller than that of the first convex lens.

5. A multi-channel synchronous laser frequency locking device based on atomic reference as described in claim 1 or 4, characterized in that, The atomic gas chamber includes: The cesium atomic vapor chamber is located inside the atomic gas chamber. The probe light passing parallel to the atomic gas chamber coherently interacts with multiple back-projected coupled beams, inducing an electromagnetically induced transparency effect within the cesium atomic vapor chamber. After this interaction, the probe light emitted from the cesium atomic vapor chamber is sent to the photodetector array module. Coherent interactions include: Under the action of the probe light passing parallel through the atomic vapor cell, the cesium atoms filled in the cesium atom vapor cell undergo energy level transitions from the ground state to the first excited state; Under the action of parallel-in-phase coupled light, cesium atoms undergo energy level transitions from the first excited state to the Rydberg state, wherein the principal quantum number of cesium atoms in the Rydberg state is greater than or equal to 50.

6. The multi-channel synchronous laser frequency locking device based on atomic reference as described in claim 5, characterized in that, The photodetector array module includes: Multiple photodetectors are arranged flush with the detection light area. The detection light emitted from the cesium atom vapor chamber is incident on the multiple photodetectors. The multiple photodetectors synchronously collect electromagnetically induced transparent spectral signals and convert them into multiple electrical signals, which are then sent to the coupling light array module.

7. A multi-channel synchronous laser frequency locking device based on atomic reference as described in claim 1 or 6, characterized in that, The closed-loop feedback system includes: Multiple error signal extraction units are communicatively connected to multiple photodetectors to calculate the peak position shift of the electromagnetically induced transparent spectral signal in real time and output the error voltage. Multiple PID control units are communicatively connected to multiple error signal extraction units to process error voltages and output control voltage range data. Multiple laser frequency real-time correction units are connected to multiple PID control units respectively, and are used to adjust the resonant cavity length of the coupled optical semiconductor laser through PZT piezoelectric ceramics according to the control voltage range data.

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