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Pound-Drever-Hall digital laser frequency stabilizing system with multi-phase filtering structure

A technology of polyphase filtering and filtering structure, which is applied in the direction of lasers, laser components, phonon exciters, etc., can solve the problems of radio frequency signal long-term amplitude instability, quantization error, and reduce frequency stabilization accuracy, etc., to achieve fully automatic The effects of tracking and locking, reducing measurement and calculation errors, and improving frequency stabilization accuracy

Inactive Publication Date: 2015-07-22
XI'AN PETROLEUM UNIVERSITY
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AI Technical Summary

Problems solved by technology

The long-term amplitude instability of the RF signal and the distortion and image frequency interference brought by the analog mixer greatly reduce the frequency stabilization accuracy
The digital mixer needs to generate a digital quadrature reference signal. This process will bring a certain quantization error and reduce the frequency stabilization accuracy.

Method used

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  • Pound-Drever-Hall digital laser frequency stabilizing system with multi-phase filtering structure

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Embodiment Construction

[0020] The present invention will be described in detail below with reference to the drawings and specific embodiments.

[0021] Reference figure 1 , Pound-Drever-Hall digital laser frequency stabilization system with multiple filter structures, including laser source 1. The laser output from laser source 1 enters polarizer 3 through optical isolator 2. The function of optical isolator 2 is to prevent reflected light from entering the laser 1 Affect its working stability; Polarizer 3 adjusts the polarization direction of the laser incident on the electro-optic modulator 4 to reduce the residual amplitude modulation; the output light of the polarizer 3 enters the electro-optic modulator 4 for phase modulation, and the modulation frequency is the radio frequency The frequency of the signal source 15. The radio frequency signal source 15 generates a frequency of f 0 The sine signal of, provides drive for the electro-optic modulator 4. The phase-modulated light enters the polarizati...

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Abstract

Disclosed is a Pound-Drever-Hall digital laser frequency stabilizing system with a multi-phase filtering structure. A radio frequency signal source only provides the driving voltage for an electro-optical modulator, and does not serve as a demodulation reference signal. An analog-digital converter collects a beat frequency signal of an photoelectric detector, the beat frequency signal enters an FPGA controller, multi-phase filtering orthogonal demodulation operation and frequency drift signal calculation are conducted in the FPGA controller, so that the frequency stabilizing effect is achieved. According to the Pound-Drever-Hall digital laser frequency stabilizing system with the multi-phase filtering structure, a frequency mixer and a low-pass filter are not used, the multi-phase filtering structure is adopted by a demodulation algorithm, and the demodulation algorithm is implemented in the FPGA controller; meanwhile, the FPGA controller further conducts PID control operation. Due to the fact that the frequency mixer and the low-pass filter are replaced by the multi-phase filtering structure, the frequency of distortion and image frequency interference caused by the frequency mixer and the low-pass filter is reduced, and the frequency stabilizing accuracy is improved.

Description

Technical field [0001] The invention belongs to the technical field of laser frequency stabilization systems, and particularly relates to a Pound-Drever-Hall digital laser frequency stabilization system with a polyphase filter structure. Background technique [0002] Pound-Drever-Hall frequency stabilization method is widely used in narrow-linewidth ultra-stable laser frequency stabilization system due to its advantages such as not easy to lose lock, strong system anti-interference ability, high stability, and no wavelength limitation. The principle of the method is: the electro-optic modulator is driven by a radio frequency signal, the laser output beam is phase-modulated by the electro-optic modulator and then vertically incident to the F-P reference cavity, and the three reflected lights are beaten on the photodetector. If the laser frequency is equal to the resonance frequency of the reference cavity, the modulation frequency signal output after the beat frequency is zero; ot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/13
Inventor 苏娟严正国张家田吴银川
Owner XI'AN PETROLEUM UNIVERSITY
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