Eighth Symposium on Novel Photoelectronic Detection Technology and Applications
Pound-Drever-Hall, FPGA, laser frequency stabilization, temperature sensor.
A laser frequency locking control circuit based on field-programmable-gate-array (FPGA) was developed to deploy
a laser frequency locking system to meet the requirement of high-resolution temperature measurement. This system is
based on the Pound-Drever-Hall (PDH) frequency stabilization technology. The FPGA is designed as the core control,
combined with Direct Digital Synthesizer (DDS) technology to realize the function generator, ramp generator, Lock-in,
infinite impulse response filter (IIR filter), proportion integration differentiation (PID), Relock and other functional
modules. The function generator generates the modulation and demodulation signal to obtain the system error signal.
According to the error signal sent to the PID, the output feedback voltage is adjusted by the PID to stay on the zero-cross
point of the error signal so that the laser driver is controlled to stabilize the frequency of the laser to a resonance. This
system has demonstrated frequency stability of 10-11 experimentally with a small size of 100mm×75mm.