Related Experiment Video
Updated: Jan 11, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
Published on: January 28, 2019
Adaptive phase locking in coherent beam combining with deep reinforcement learning
None:
Locking of optical coherence by single-detector electronic-frequency tagging (LOCSET) stands as the main horse for locking the phase among different channels in coherent beam combining (CBC) systems. However, the coherent demodulation in LOCSET is manually synchronized, and vital hyperparameters of LOCSET are manually determined, and cannot adapt to encountered disturbances. Therefore, the upper limit of LOCSET remains unexplored. Here, a deep-reinforcement-learning-enabled adaptive phase-locking strategy for LOCSET in CBC systems is proposed, which consists of two well-trained agents: the Delay-Agent and the Ada-Agent. The Delay-Agent identifies the fitting phase delay configuration for realizing automatic synchronization in coherent demodulation, and the Ada-Agent dynamically optimizes the proportional coefficient and integration time in response to encountered disturbances. The proposed scheme is experimentally validated in a four-channel CBC system, where the Delay-Agent can locate the fitting phase delay combination in one step. Compared to bare LOCSET, the Ada-Agent brings 4.5-fold improvement in recovery speed under both sinusoidal and step-wise phase disturbance in experiments. We believe the proposed adaptive phase-locking strategy can be applied in situ to enhance the phase-locking performance of LOCSET in various CBC systems.
Related Concept Videos
Phase-lead and Phase-lag Controllers
Reinforcement
Positive reinforcement occurs when a behavior is followed by the presentation of a rewarding stimulus, increasing the frequency of that behavior. For example:
Associative Learning
Classical conditioning, also known...
Reinforcement Schedules
Once a behavior is learned,...
Observational Learning
Prismatic Beams: Problem Solving
The design begins with analyzing the beam as a free body to identify moments and force balances, thereby determining support reactions. Next, the...

