A laser frequency locking control circuit based on FPGA for marine temperature sensor

Cheng Zhang; Lanting Ji; Dexin Gao; Gang Li; Chi Wu

doi:10.1117/12.2627015

27 March 2022 A laser frequency locking control circuit based on FPGA for marine temperature sensor

Cheng Zhang, Lanting Ji, Dexin Gao, Gang Li, Chi Wu

Proceedings Volume 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications; 12169BN (2022) https://doi.org/10.1117/12.2627015
Event: Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 2021, Kunming, China

Abstract

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^-11experimentally with a small size of 100mm×75mm.

Citation Download Citation

Cheng Zhang, Lanting Ji, Dexin Gao, Gang Li, and Chi Wu "A laser frequency locking control circuit based on FPGA for marine temperature sensor", Proc. SPIE 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 12169BN (27 March 2022); https://doi.org/10.1117/12.2627015

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