Laser power stabilization system based on FPGA and liquid crystal TNE effect

Abstract

The invention discloses a laser power stabilization system based on an FPGA and a liquid crystal TNE effect. The laser power stabilization system comprises a half-wave plate, a liquid crystal phase delayer, a polarization beam splitter, a photoelectric detector, an FPGA calculation module, an analog output module and an analog input module. And the analog output module and the analog input module are directly connected with the FPGA calculation module respectively. In order to improve the response speed of the liquid crystal, the TNE driving technology is adopted, and the response speed of the liquid crystal can be effectively improved. When the liquid crystal phase delay needs to be increased, all the driving voltages are temporarily revoked, liquid crystal molecules undergo natural relaxation for a period of time and start to recover to the initial position, and then the driving voltage with the proper size is applied to achieve the expected phase delay. The liquid crystal response speed can be effectively improved, and the frequency response of a liquid crystal stable power system is improved.

Description

technical field [0001] The invention belongs to the field of automatic control, in particular to a laser power stabilization system based on FPGA and liquid crystal TNE effect. Background technique [0002] Stable laser power plays a vital role in various applications such as atomic magnetometers, atomic clocks and gravitational wave detection. Laser power stabilization methods can be divided into internal control and external control. Internal control means that the laser power can be stabilized by current or temperature feedback. However, because the frequency and power of the laser are coupled to each other, the adjustment of current or temperature inevitably interferes with the stability of the frequency, which cannot meet the experimental needs of high frequency stability. External control is to use AOM, EOM, LCVR and other external actuators to achieve controllable attenuation of optical power noise. Due to the laser power stabilization system based on liquid crystal...

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Problems solved by technology

[0003] However, most of the existing laser power stabilization systems based on liquid crystal phase retarders are based on single-chip microcomputers.

For the single-chip microcomputer platform, the stable system has the advantage of relatively high control frequency, but limited by the performance of the single-chip microcomputer, it cannot simultaneously complete the functions of high-speed calculation, real-time data monitoring and storage

In addition, the liquid crystal response speed of the existing power stabilization system is relatively slow

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