Method and device for high-precision frequency and phase detection signal processing in laser offset frequency locking
A technology of frequency and phase detection and signal processing, which is applied in the field of high-precision frequency and phase detection signal processing in laser offset frequency locking, and can solve the problems of difficulty in improving the accuracy of beat frequency signal phase detection and small capture range
Active Publication Date: 2021-07-06
ZHEJIANG SCI-TECH UNIV
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[0005] In order to solve the problems existing in the background technology, the present invention discloses a high-precision frequency and phase detection signal processing method and device in laser offset frequency locking, which solves the difficulty in improving the accuracy of beat frequency signal phase detection in laser frequency locking to optical frequency comb technology and the problem of small capture range
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[0040] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0041] Such as figure 1 As shown, the specific implementation device includes an analog-to-digital sampler 1, a digitally controlled oscillator 2, a first multiplier 3, a second multiplier 4, a first low-pass filter 5, a second low-pass filter 6, and coordinate rotation Operation unit 7, phase unwinding operation unit 8, gain controller 9, digital-to-analog converter 10, fast Fourier operation unit 11, frequency counter 12, ARM processor 13, femtosecond optical frequency comb 14, beat frequency signal detection Unit 15, atomic clock 16, tunable laser 17, computer 18, analog PID controller 19.
[0042] The output end of the tunable laser 17 femtosecond optical frequency comb 14 is connected to the beat frequency signal detection unit 15, the output end of the beat frequency signal detection unit 15 is connected to the analog-digital sampler 1, and the...
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The invention discloses a high-precision frequency and phase detection signal processing method and device in laser bias frequency locking. The tunable laser and the femtosecond optical frequency comb pass through the beat frequency signal detection unit to obtain the beat frequency signal, and after the analog-to-digital sampling, enter the FPGA development board for frequency discrimination and phase discrimination processing. The beat frequency signal is multiplied by the reference signal and low-pass filtered, and the corresponding phase is obtained through the coordinate rotation operator. The phase is scaled after phase unwrapping, and the error voltage signal is output to the analog PID controller through the digital-to-analog converter. , the analog PID controller generates a control signal to the tunable laser for closed-loop control, locks the frequency of the beat signal to the reference signal, and calculates the signal-to-noise ratio, frequency, and amplitude of the beat signal at the same time. The invention solves the problems that it is difficult to improve the accuracy of frequency and phase discrimination of beat frequency signals and the capture range is small in the offset frequency locking technology of locking the laser to the optical frequency comb, and can be widely used in the field of laser precision measurement.
Description
technical field [0001] The invention belongs to a signal processing method and device in the technical field of laser frequency stabilization, in particular to a signal processing method and device for high-precision frequency and phase detection in laser bias frequency locking. Background technique [0002] Laser interferometry technology has the advantages of fast response speed, high measurement accuracy, strong anti-interference ability, and direct traceability to the definition of meters. Therefore, it is widely used in high-precision displacement measurement, ultra-precision processing and manufacturing, and instrument testing and calibration. In laser interferometry, the stability and traceability of laser frequency are the key factors affecting the measurement accuracy. The key to laser frequency stabilization technology is to select a stable reference frequency standard. The traditional laser frequency stabilization technology mainly locks the laser frequency to a p...
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IPC IPC(8): G01B9/02H01S3/13
CPCG01B9/0201H01S3/13H01S3/1305H01S3/1307
Inventor 陈本永谢建东严利平
Owner ZHEJIANG SCI-TECH UNIV