Pound-Drever-Hall Feedforward: Laser Phase Noise Suppression beyond Feedback

Abstract

Pound-Drever-Hall (PDH) laser frequency stabilization is a powerful technique widely used for building narrow-linewidth lasers. This technique is however ineffective in suppressing high-frequency (>100~kHz) laser phase noise detrimental for many applications. Here, we introduce an effective method which can greatly enhance its high-frequency performance. The idea is to recycle the residual PDH signal of a laser locked to a cavity, by feedforwarding it directly to the laser output field after a delay fiber. Using this straightforward method, we demonstrate a phase noise suppression capability about 4 orders of magnitude better than just using usual PDH feedback for phase noise around a few MHz. We further find that this method exhibits noise suppression performance equivalent to cavity filtering. The new method holds great promise for applications demanding highly stable lasers with diminished phase noise up to tens of MHz, e.g. precise and high-speed control of atomic and molecular quantum states.

References in corpus (19)

• Advanced LIGO
• A High Phase-Space-Density Gas of Polar Molecules
• An ${}^{27}$Al${}^{+}$ quantum-logic clock with systematic uncertainty below $10^{-18}$
• Ultracold dense samples of dipolar RbCs molecules in the rovibrational and hyperfine ground state
• Creation of ultracold ${}^{87}$RbCs molecules in the rovibrational ground state
• Photonic microwave signals with zeptosecond level absolute timing noise
• New Limits on Coupling of Fundamental Constants to Gravity Using ${}^{87}$Sr Optical Lattice Clocks
• Sub-Hz line width diode lasers by stabilization to vibrationally and thermally compensated ULE Fabry-Perot cavities
• Experimental noise filtering by quantum control
• 36 Hz integral linewidth laser based on a photonic integrated 4.0-meter coil resonator
• High fidelity entanglement of neutral atoms via a Rydberg-mediated single-modulated-pulse controlled-PHASE gate
• Search for ultralight dark matter from long-term frequency comparisons of optical and microwave atomic clocks
• Sensitivity of quantum gate fidelity to laser phase and intensity noise
• Evidence for association of triatomic molecule in ultracold ${}^{23}$Na${}^{40}$K and ${}^{40}$K mixture
• Active cancellation of servo-induced noise on stabilized lasers via feedforward
• Efficient conversion of closed-channel dominated Feshbach molecules of ${}^{23}$Na${}^{40}$K to their absolute ground state
• Simple phase noise measurement scheme for cavity-stabilized laser systems
• High-frequency broadband laser phase noise cancellation using a delay line
• Robust phase-controlled gates for scalable atomic quantum processors using optical standing waves

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• Extended two-body Rydberg blockade interaction with off-resonant modulated driving
• Enhanced quantum state transfer via feedforward cancellation of optical phase noise
• Quantum-enhanced laser phase noise filter
• A High-Power Clock Laser Spectrally Tailored for High-Fidelity Quantum State Engineering
• Measurement and feed-forward correction of the fast phase noise of lasers
• From ultra-noisy to ultra-stable: optimization of the optoelectronic laser lock
• Feedforward Cancellation of High-Frequency Phase Noise in Frequency-Doubled Lasers