Alignment sensing and control for squeezed vacuum states of light
arXiv:1507.06468 · doi:10.1364/OE.24.000146
Abstract
Beam alignment is an important practical aspect of the application of squeezed states of light. Misalignments in the detection of squeezed light result in a reduction of the observable squeezing level. In the case of squeezed vacuum fields that contain only very few photons, special measures must be taken in order to sense and control the alignment of the essentially dark beam. The GEO600 gravitational wave detector employs a squeezed vacuum source to improve its detection sensitivity beyond the limits set by classical quantum shot noise. Here, we present our design and implementation of an alignment sensing and control scheme that ensures continuous optimal alignment of the squeezed vacuum field at GEO 600 on long time scales in the presence of free-swinging optics. This first demonstration of a squeezed light automatic alignment system will be of particular interest for future long-term applications of squeezed vacuum states of light.
References in corpus (4)
Cited by in corpus (8)
- Exploring the Sensitivity of Next Generation Gravitational Wave Detectors
- Squeezed states of light and their applications in laser interferometers
- GEO 600 and the GEO-HF upgrade program: successes and challenges
- First demonstration of 6 dB quantum noise reduction in a kilometer scale gravitational wave observatory
- Mitigating mode-matching loss in nonclassical laser interferometry
- Quantum correlation measurements in interferometric gravitational wave detectors
- Matrix Heater in the Gravitational Wave Observatory GEO 600
- Machine Learning for Quantum-Enhanced Gravitational-Wave Observatories