High-bandwidth Coherence Cloning using Optical-Phase-Locking Feedforward

• URL: http://arxiv.org/abs/2604.02218v1
• Date: Thu, 02 Apr 2026 16:10:41 GMT
• Title: High-bandwidth Coherence Cloning using Optical-Phase-Locking Feedforward
• Abstract summary: Optical phase locking (OPL) is the standard technique for cloning the coherence of such sources.<n>We present a robust feedforward architecture that overcomes this limitation by recycling and demodulating the existing master-slave beat signal.<n>We demonstrate robust suppression exceeding 30 dB from 10 kHz to 10 MHz.
• Score: 8.133032152382453
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Ultra-narrow-linewidth lasers with suppressed high-frequency phase noise are critical for quantum control and precision metrology. While optical phase locking (OPL) is the standard technique for cloning the coherence of such sources, its effectiveness is often limited at high frequencies by feedback latency. We present a robust feedforward architecture that overcomes this limitation by recycling and demodulating the existing master-slave beat signal to drive a single electro-optic modulator for near-instantaneous noise cancellation. This approach eliminates the extraneous sidebands and transmission losses typical of more complex modulators. Through active stabilization of the beat amplitude and demodulation phase, we demonstrate robust suppression exceeding 30 dB from 10 kHz to 10 MHz. This hardware-efficient framework is readily compatible with standard OPL setups, offering a scalable solution for high-fidelity coherent control.

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