Laser power stabilization system with a variable optical attenuator

Laser power stability is critical for precision laser systems. Here, we present a fully fiber-coupled laser power stabilization system with a compact, lower power consumption Variable Optical Attenuator (VOA). This system can provide stabilized laser output both in-loop and out-of-loop to meet various requirements. A 12-h stability test demonstrated that the power was stabilized at 2.4 mW, The relative stability of laser power in terms of root mean square and peak to peak was 0.0273% and 0.1298%, respectively, while the Allan deviation was 6.64 × 10-6 at 1 s and 1.11 × 10-4 at 1000 s. The low-power operation and compact dimensions of VOAs contribute to the development of laser stabilization systems with enhanced miniaturization, power efficiency, and reliability.