A Miniaturized Temperature Control Circuit Design of VCSEL Laser Based on FPGA
Atomic magnetometers are known for their high sensitivity and are often used to measure magnetic fields. How-ever,the stability of the laser wavelength in the magnetometer system is easily affected by temperature,leading to a de-crease in sensitivity. To improve temperature stability,a FPGA-based laser temperature control circuit was designed using the ZYNQ7020 as the main control chip. This allows for information exchange between the programmable logic side and the processing system side,and uses a PID algorithm for data processing to adjust the amplitude of the heating signal. To prevent magnetic field interference from the direct current heating signal,which could affect the performance of the magne-tometer,a 1 MHz alternating current sine wave is used for heating,completing the closed-loop control of temperature. The VCSEL temperature control circuit was ultimately miniaturized. Experimental results show that the circuit can maintain a temperature of 80 ℃ with a control precision of±0.0035 ℃,meeting the needs of the magnetometer system's laser for temperature stability.
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