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CN-122026906-A - Atomic light frequency standard rapid self-locking system and method

CN122026906ACN 122026906 ACN122026906 ACN 122026906ACN-122026906-A

Abstract

The invention discloses a fast self-locking system of an atomic light frequency standard, which comprises a Zhong Jiguang device, wherein the output of the Zhong Jiguang device sequentially passes through a super-stable cavity system, a frequency power modulation optical system and a first spectroscope and then is divided into a first path of modulated laser and a second path of modulated laser, a spectrum data acquisition system acquires spectrum data generated by a first path of modulated laser incidence atomic system physical system, the spectrum data acquisition system is respectively connected with a servo feedback system and an integrated automatic control system, the servo feedback system is connected with the frequency power modulation optical system, the output of a femtosecond optical comb is connected with three paths of modulated laser beat frequency generated by the second path of modulated laser to enter a photoelectric detector, and a laser, the super-stable cavity system, the frequency power modulation optical system, a laser frequency scanning system, an atomic system physical system and a femtosecond optical comb are respectively connected with the integrated automatic control system. The invention also discloses a quick self-locking method of the atomic light frequency standard, which realizes the quick locking of the atomic light frequency standard.

Inventors

  • XIAO LIYUAN
  • LONG ZHOU

Assignees

  • 武汉谱赛斯科技有限公司

Dates

Publication Date
20260512
Application Date
20260116

Claims (9)

  1. 1. The fast self-locking system for the atomic light frequency standard comprises a Zhong Jiguang machine (1) and is characterized in that clock laser output by the Zhong Jiguang machine (1) sequentially passes through an ultra-stable cavity system (2), a frequency power modulation optical system (3) and a first spectroscope (4) and then is divided into a first path of modulated laser and a second path of modulated laser, the first path of modulated laser enters an atomic system physical system (6) to generate energy level transition of atoms after passing through a laser frequency scanning system (5), a spectrum data acquisition system (7) acquires transition signal spectrums in the energy level transition process and outputs spectrum data, the spectrum data acquisition system (7) is respectively connected with a servo feedback system (9) and an integrated automatic control system (8), and the servo feedback system (9) is connected with the frequency power modulation optical system (3); The second path of modulated laser is divided into a third path of modulated laser and a fourth path of modulated laser after passing through a second beam splitter (13), a comb tooth laser signal output by a femtosecond optical comb (12) is transmitted through the second beam splitter (13) and then enters a photoelectric detector (14) together with the third path of modulated laser beat frequency to generate a beat frequency signal, the photoelectric detector (14) inputs the measured beat frequency signal into an integrated automatic control system (8), and the integrated automatic control system (8) extracts the modulated laser frequency from the beat frequency signal Zhong Jiguang device (1), ultra stable cavity system (2), frequency power modulation optical system (3), laser frequency scanning system (5), atomic system physical system (6), and femtosecond optical comb (12) are respectively connected with integrated automatic control system (8), femtosecond optical comb (12) is connected with hydrogen clock (11), and hydrogen clock (11) is connected with GPS receiver 10.
  2. 2. An atomic light frequency standard quick self-locking method, which uses the atomic light frequency standard quick self-locking system as set forth in claim 1, and is characterized by comprising the following steps: step 1, acquiring the atomic system Zhong Yueqian frequency of the atomic system physical system (6) ; Step 2, obtaining modulated laser frequency based on beat frequency signals ; Step 3, adjusting the frequency of the modulated laser To atomic system Zhong Yueqian frequency ; Step 4, based on the modulated laser frequency after adjustment Acquiring N experimental data points; Step 5, performing first linear fitting on the experimental data points obtained in the step 4 to obtain first fitting drift, and modulating the laser frequency after adjustment Performing first drift compensation to make the modulated laser frequency after the first drift compensation Equal to the frequency corresponding to the central value of the line fitted first ; Step 6, modulating the laser frequency after adjustment Carry out the first step Sub-drift compensation; step 7, adding 1 to the drift compensation times, and returning to the step 6; step 8, based on the modulated laser frequency after adjustment And (3) judging the unlocking reasons of the modulated laser, solving unlocking faults aiming at different unlocking reasons, and returning to the step (2) after the unlocking faults are solved.
  3. 3. The method for fast self-locking atomic light frequency standard according to claim 2, wherein the atomic system Zhong Yueqian frequency of the atomic system physical system (6) is obtained Based on the following steps: The method comprises the steps that clock laser generated by a Zhong Jiguang device (1) is preliminarily locked by a hyperstable cavity system (2) and then enters a first spectroscope (4) to generate first path of modulated laser and second path of modulated laser, the first path of modulated laser enters an atomic system physical system (6) after being regulated by a laser frequency scanning system (5), the laser frequency scanning system (5) is controlled by an integrated automatic control system (8), the frequency of the first path of modulated laser is scanned to realize the energy level transition of atoms in the atomic system physical system (6), a spectrum data acquisition system (7) acquires a transition signal spectrum in the energy level transition process of the atoms and extracts the atomic system Zhong Yueqian frequency of the atomic system physical system (6) as follows 。
  4. 4. The method for fast self-locking atomic light frequency standard according to claim 3, wherein the clock laser frequency is obtained based on beat signal Based on the following steps: The second path of modulated laser is divided into a third path of modulated laser and a fourth path of modulated laser after passing through a second beam splitter (13), beat frequency signals generated by beat frequency signals of the third path of modulated laser and comb tooth laser signals enter a photoelectric detector (14), the photoelectric detector (14) inputs the measured beat frequency signals into an integrated automatic control system (8), and the integrated automatic control system (8) extracts modulated laser frequency from the beat frequency signals 。
  5. 5. A method for fast self-locking an atomic light frequency standard according to claim 3, wherein said modulating laser frequency Obtained based on the following formula: ; Wherein, the For the first comb tooth frequency, Is the space between the adjacent comb teeth, Is the first The root comb teeth and the third path of modulated laser frequency beat frequency obtain beat frequency signals.
  6. 6. The method for rapid self-locking of atomic light standard according to claim 2, wherein the adjusting modulates the laser frequency To atomic system Zhong Yueqian frequency Based on the following steps: the integrated automatic control system (8) extracts the modulated laser frequency Taking the modulated laser frequency At Zhong Yueqian frequency with atomic system The difference value of (2) is the frequency difference value ; If the frequency difference value is If the frequency is larger than or equal to the set threshold value, the integrated automatic control system (8) adjusts the frequency shift parameter of the ultra-stable cavity system (2) to primarily adjust the clock laser frequency so as to enable the frequency difference value to be The integrated automatic control system (8) controls the frequency power modulation optical system (3) to readjust the primarily adjusted clock laser frequency output by the ultra-stable cavity system (2) so as to lead the modulated laser frequency after adjustment ; If the frequency difference value is The integrated automatic control system (8) controls the frequency power modulation optical system (3) to adjust the clock laser frequency after preliminary frequency locking so as to adjust the modulated laser frequency after adjustment 。
  7. 7. The method for fast self-locking of atomic light standards according to claim 2, wherein said modulated laser frequency is based on an adjustment The acquisition of N experimental data points is based on the following steps: at the modulated laser frequency Taking N frequency points in a set range for the center, taking the first path of modulated laser frequency as the frequency corresponding to the N frequency points, randomly scanning the first path of modulated laser frequency, and obtaining N experimental data points in one-to-one correspondence with the occurrence probability of the first path of modulated laser frequency and the fluorescence signal, wherein the abscissa of the experimental data points is the first path of modulated laser frequency, and the ordinate is the occurrence probability of the fluorescence signal.
  8. 8. The method for fast self-locking of atomic light standards according to claim 2, wherein said modulating laser frequency Carry out the first step The secondary drift compensation is based on the following steps: In the first place Adjusting laser frequency obtained by secondary drift compensation Is the central value, the first Sub-drift compensated half-width at half-maximum As the frequency interval, execute the first In each random scanning, M obtained frequency points are arranged in a disordered order, the first path of modulated laser frequency is sequentially set to the frequencies corresponding to the M frequency points after the disordered order, the stay of each frequency point is set for a long time, the fluorescent signals obtained by a spectrum data acquisition system (7) are sequentially recorded or not, a plurality of random scanning is carried out to obtain M experimental data points, the abscissa of the experimental data points is the first path of modulated laser frequency, the ordinate is the occurrence probability of the fluorescent signals, and the first path of modulated laser frequency is the first path of modulated laser frequency, the second path of modulated laser frequency is the first path of modulated laser frequency Fitting the experimental data points with the secondary drift compensation to obtain the first Fitting spectral line once, calculating Frequency corresponding to central value of sub-fitting spectral line And half width at half maximum And calculate the first Sub-fitting drift , If it is , Is the first The half-width of the subshaped spectral line is half-width, the modulated laser is in a locking state, the first Sub-fitting drift Feedback to the frequency power modulating optical system (3) such that Clock laser frequency after drift compensation Adding to For the modulated laser frequency after adjustment Carry out the first step Sub-drift compensation is carried out, and then step 7 is carried out; If it is And stopping drift compensation, judging that the laser is regulated to be unlocked, namely, the atomic light frequency standard is unlocked, and entering the step 8.
  9. 9. The method for fast self-locking atomic light frequency standard according to claim 2, wherein the step 2 of judging the unlocking cause of the modulated laser and solving the unlocking fault for different unlocking causes comprises the steps of: Step 8.1, checking the modulated laser frequency before and after unlocking Whether or not to occur Is a constant jitter of (1); step 8.2, modulating the laser frequency after adjustment Appearance of The continuous jitter of the laser is judged to be the unlocking reason of the laser ultra-stable cavity system (2), and the integrated automatic control system (8) scans and adjusts the parameters of the ultra-stable cavity system (2) until the adjusted modulated laser frequency Stabilized against further appearance The unlocking fault of the modulated laser caused by the shaking and unlocking of the laser ultra-stable cavity system (2) is solved; Step 8.3, modulating the laser frequency after adjustment Does not occur The continuous jitter of the modulated laser is judged to be abnormal in ion quantum state or ion trapping, an integrated automatic control system (8) controls an atomic system physical system (6) to prepare ions and quantum states again, and when a spectrum data acquisition system (7) acquires a transition signal spectrum again, the unlocking fault of the modulated laser caused by the abnormal ion quantum state or ion trapping is solved; And 8.4, returning to the step 2 after the unlocking fault of the modulated laser is solved.

Description

Atomic light frequency standard rapid self-locking system and method Technical Field The invention belongs to the technical field of atomic light frequency standards, and particularly relates to a rapid self-locking system of an atomic light frequency standard and a rapid self-locking method of the atomic light frequency standard. Background Atomic frequency standard has been the basic stone of time and frequency standards since its invention. At present, an atomic frequency standard mainly comprises an atomic microwave frequency standard and an atomic light frequency standard, and the atomic microwave frequency standard is widely applied to various aspects of social life, including various current navigation systems such as a United states GPS (Global positioning System), a Russian system (GLONASS), a European Union Galileo positioning system (GALILEO), a Chinese Beidou satellite navigation system (BDS) and the like. The atomic light frequency standard is rapidly developed from about 2000, and the continuous improvement of the precision makes the atomic light frequency standard become a hot spot for current scientific research and technical development, and the atomic light frequency standard comprises that more than 10 light frequency standards Zhong Yueqian are used as secondary second definition references at present, is hopeful to participate in the future second definition transformation and is gradually applied to various large navigation systems. Optical frequency standard is locked to electron transition frequency of atoms or ions in an optical frequency band, and in a second definition roadmap and a scheme published by the International measuring office (BIPM), the optical frequency standard is required to participate in contribution to international atomic time so as to conduct conventional counting, and the optical frequency standard is required to have the capability of stable continuous operation and automatic control. At present, although the international optical frequency scale has higher uncertainty and stability and is widely studied in scientific research, the stable continuous operation and automatic control of the optical frequency scale are still lacking, and no very perfect commercially available optical frequency scale is available, wherein the problem that the optical frequency scale is locked frequently and needs to be manually searched for reasons and locked again is mainly existed. Disclosure of Invention The invention aims to solve the problems in the prior art, and provides a fast self-locking system of an atomic light clock and a fast self-locking method of an atomic light frequency standard. In order to solve the technical problems, the invention adopts the following technical scheme: The fast self-locking system for atomic light frequency standard comprises Zhong Jiguang units, wherein clock laser output by Zhong Jiguang units sequentially passes through an ultra-stable cavity system, a frequency power modulation optical system and a first spectroscope and then is divided into a first path of modulated laser and a second path of modulated laser, the first path of modulated laser is incident on an atomic system physical system to generate energy level transition after passing through a laser frequency scanning system, a spectrum data acquisition system acquires a transition signal spectrum in the energy level transition process and outputs spectrum data, the spectrum data acquisition system is respectively connected with a servo feedback system and an integrated automatic control system, and the servo feedback system is connected with the frequency power modulation optical system; The second path of modulated laser is divided into a third path of modulated laser and a fourth path of modulated laser after passing through a second beam splitter, a comb tooth laser signal output by a femtosecond optical comb is transmitted through the second beam splitter and then is subjected to beat frequency generation with the third path of modulated laser to generate a beat frequency signal, the beat frequency signal enters a photoelectric detector, the photoelectric detector inputs the measured beat frequency signal into an integrated automatic control system, and the integrated automatic control system extracts the modulated laser frequency from the beat frequency signal Zhong Jiguang, an ultra-stable cavity system, a frequency power modulation optical system, a laser frequency scanning system, an atomic system physical system and a femtosecond optical comb are respectively connected with an integrated automatic control system, the femtosecond optical comb is connected with a hydrogen clock, and the hydrogen clock is connected with a GPS receiver. An atomic light frequency standard quick self-locking method, which utilizes the atomic light frequency standard quick self-locking system, comprises the following steps: Step 1, acquiring the atomic system Zhong Yueqian frequency of an atomic