High-spectral-resolution lidar (HSRL) has the advantages of high spatial and temporal resolution, high detection accuracy as well as strong signal-to-noise ratio. However, the stability of emitted laser frequency is crucial for the accuracy of HSRL inversion data. To ensure the data quality of HSRL, we have constructed a compact, low-cost but satisfactory frequency locking system based on an iodine absorption cell and STM32 Microprogrammed Control Unit (MCU). MCU acquires the spectrum transmittance of the iodine cell, and employs the proportional integral differential (PID) algorithm to control the drive current of seed laser; thereby the frequency of the emitted laser is locked to one of the iodine absorption line. According to the experimental results, a considerable frequency standard deviation of 4 MHz is achieved. Furthermore, the performance of this system during HSRL long-term observations is also proved to be stable and reliable
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