High-frequency broadband laser phase noise cancellation using a delay line

Abstract

Laser phase noise remains a limiting factor in many experimental settings, including metrology, time-keeping, as well as quantum optics. Hitherto this issue was addressed at low frequencies, ranging from well below 1 Hz to maximally 100 kHz. However, a wide range of experiments, such as, e.g., those involving nanomechanical membrane resonators, are highly sensitive to noise at higher frequencies in the range of 100 kHz to 10 MHz, such as nanomechanical membrane resonators. Here we employ a fiber-loop delay line interferometer optimized to cancel laser phase noise at frequencies around 1.5 MHz. We achieve noise reduction in 300 kHz-wide bands with a peak reduction of more than 10 dB at desired frequencies, reaching phase noise of less than -160 dB (rad${}^2$/Hz) with a Ti:Al${}_2$O${}_3$ laser. These results provide a convenient noise reduction technique to achieve deep ground-state cooling of mechanical motion.

12 pages, 6 figures

References in corpus (16)

• A sub-40 mHz linewidth laser based on a silicon single-crystal optical cavity
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• Optical detection of radio waves through a nanomechanical transducer
• Measurement-based quantum control of mechanical motion
• Ultra-coherent nanomechanical resonators via soft clamping and dissipation dilution
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• Cavity cooling of a levitated nanosphere by coherent scattering
• Electronic Noise in Optical Homodyne Tomography
• Feedback cooling of a room temperature mechanical oscillator close to its motional groundstate
• Laser noise in cavity-optomechanical cooling and thermometry
• Resolved Sideband Cooling of a Levitated Nanoparticle in the Presence of Laser Phase Noise
• Observation of Fundamental Thermal Noise in Optical Fibers down to Infrasonic Frequencies
• Phonon counting thermometry of an ultracoherent membrane resonator near its motional ground state

Cited by in corpus (6)

• Pound-Drever-Hall Feedforward: Laser Phase Noise Suppression beyond Feedback
• Active cancellation of servo-induced noise on stabilized lasers via feedforward
• Enhancing Membrane-Based Scanning Force Microscopy Through an Optical Cavity
• Non-classical correlations between photons and phonons of center-of-mass motion of a mechanical oscillator
• Roto-translational optomechanics
• Amplitude Noise Cancellation of Microwave Tones