Long-term Hybrid Stabilization of the Carrier-Envelope Phase

Abstract

Controlling the carrier envelope phase (CEP) in mode-locked and associated laser systems over practically long timescales is crucial for real-world applications in ultrafast optics and precision metrology. We present a hybrid solution that combines a feed-forward (FF) technique to stabilize the phase offset in fast timescales and a feedback (FB) technique that addresses slowly varying sources of interference. We experimentally realize the hybrid stabilization system in an Er:Yb:glass mode-locked laser and demonstrate 75 hours of stabilization with integrated phase noise of 14 mrad, corresponding to around 11 as of timing jitter. Additionally, we examine the impact of environmental factors, such as humidity and pressure, on the long-term stability and performance of the system.