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In this work we address the advantages, limitations, and technical subtletiesof employing FPGA-based digital servos for high-bandwidth feedback control oflasers in atomic, molecular, and optical (AMO) physics experiments.Specifically, we provide the results of benchmark performance tests inexperimental setups including noise, bandwidth, and dynamic range for twodigital servos built with low and mid-range priced FPGA development platforms.The digital servo results are compared to results obtained from a commerciallyavailable state-of-the-art analog servo using the same plant for control(intensity stabilization). The digital servos have feedback bandwidths of 2.5MHz, limited by the total signal latency, and we demonstrate improvementsbeyond the transfer function offered by the analog servo including a three polefilter and a two pole filter with phase compensation to suppress resonances. Wealso discuss limitations of our FPGA-servo implementation and generalconsiderations when designing and using digital servos.

The performance and limitations of FPGA-based digital servos for atomic, molecular, and optical physics experiments