Scattered light reduction in Sagnac Speed Meters with Tunable Coherence
arXiv:2502.07383 · doi:10.1103/PhysRevD.112.022001
Abstract
Sagnac Speed Meter and ring resonators can be used as high precision instruments, but they are limited in their sensitivity through scattered light causing non-linear noise. Here, we experimentally demonstrate a technique called Tunable Coherence, where the long coherence length of the laser is broken in a controlled way, to suppress the coupling of scattered light in a Sagnac interferometer. We demonstrate a scattered light suppression of 24.2 dB in a Sagnac interferometer and discuss the experimental limitations. Further, we show an analytical discussion on how Tunable Coherence could be a fundamental solution to light scattering back from optical surfaces into the counter propagating beam, which is an issue particularly in ring resonators.
References in corpus (18)
- Observation of Gravitational Waves from a Binary Black Hole Merger
- GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
- Advanced Virgo: a 2nd generation interferometric gravitational wave detector
- Origin of the heavy elements in binary neutron-star mergers from a gravitational wave event
- Practical speed meter designs for QND gravitational-wave interferometers
- First demonstration of 6 dB quantum noise reduction in a kilometer scale gravitational wave observatory
- Reducing Scattered Light in LIGO's Third Observing Run
- Sagnac Interferometer as a Speed-Meter-Type, Quantum-Nondemolition Gravitational-Wave Detector
- The basic physics of the binary black hole merger GW150914
- The upgrade of GEO600
- Search for intermediate mass black hole binaries in the third observing run of Advanced LIGO and Advanced Virgo
- Advanced quantum techniques for future gravitational-wave detectors
- Passive, free-space laser gyroscope
- Noise level of a ring laser gyroscope in the femto-rad/s range
- Realistic polarizing Sagnac topology with DC readout for the Einstein Telescope
- Speedmeter scheme for gravitational-wave detectors based on EPR quantum entanglement
- A high sensitivity tool for geophysical applications: A geometrically locked Ring Laser Gyroscope
- Tunable coherence laser interferometry: demonstrating 40dB of straylight suppression and compatibility with resonant optical cavities