Negative Backaction Noise in Interferometric Detection of a Microlever
arXiv:1107.4447 · doi:10.1103/PhysRevLett.107.050801
Abstract
Interferometric detection of mirror displacements is intrinsically limited by laser shot noise. In practice, however, it is often limited by thermal noise. Here we report on an experiment performed at the liquid helium temperature to overcome the thermal noise limitation and investigate the effect of classical laser noise on a microlever that forms a Fabry-Perot cavity with an optical fiber. The spectral noise densities show a region of negative contribution of the backaction noise close to the resonance frequency. We interpret this noise reduction as a coherent coupling of the microlever to the laser intensity noise. This optomechanical effect could be used to improve the detection sensitivity as discussed in proposals going beyond the Standard Quantum Limit.
accepted for publication in Physical Review Letters
References in corpus (16)
- Radiation-pressure cooling and optomechanical instability of a micro-mirror
- Self-cooling of a micro-mirror by radiation pressure
- Resolved Sideband Cooling of a Micromechanical Oscillator
- Cooling of a mirror by radiation pressure
- Optomechanical Cooling of a Macroscopic Oscillator by Homodyne Feedback
- Quantum noise in second generation, signal-recycled laser interferometric gravitational-wave detectors
- Thermodynamical fluctuations and photo-thermal shot noise in gravitational wave antennae
- Fundamental Quantum Limit to Waveform Estimation
- Coherent Quantum-Noise Cancellation for Optomechanical Sensors
- Opto-Mechanics of deformable Fabry-Perot Cavities
- Thermoelastic effects at low temperatures and quantum limits in displacement measurements
- Back-action amplification and quantum limits in optomechanical measurements
- Beating quantum limits in optomechanical sensor by cavity detuning
- Observation of back-action cancellation in interferometric and weak force measurements
- Optomechanical scheme for the detection of weak impulsive forces
- Classical signature of ponderomotive squeezing in a suspended mirror resonator