Research Highlights
Recent results and detector sensitivity
GEO600 has reached a sensitivity of 2·10^(-22)/√Hz
The first direct detection of gravitational waves will mark the beginning of gravitational wave astronomy, opening a new window to the universe. The necessary high detection sensitivity calls for ultra-stable high-power lasers with outstanding beam quality. The AEI Laser Group (in close collaboration with the Laser Zentrum Hannover (LZH)) is in charge of the development of the pre-stabilised laser system (PSL) for the second generation gravitational wave detector Advanced LIGO and was chosen out of three competing groups based on its experience in the development, stabilisation and operation of GEO600.
Squeezing the quantum noise of laser light
Light is quantized, and the statistics of the photons results in unpredictable uncertainties of the amplitude and the phase of the light field. This inherent uncertainty results in quantum (shot) noise and limits the phase sensitivity of laser interferometers. However, Heisenberg's famous Uncertainty Relation allows the reduction of phase uncertainty at the expense of increased amplitude noise. In that case the quantum noise of light becomes "squeezed".
Interferometry with nano-structured optics
We research and develop nano-structured diffraction gratings to split and recombine laser beams in advanced gravitational wave detectors. These all-reflective components can replace the partly transmissive mirrors used in today's detectors. The sensitivity limiting problem of heat absorption in transmissive elements can be solved with this technology.
Characterisation and stabilisation of a high-power solid-state laser system for Advanced LIGO
The first direct detection of gravitational waves will mark the beginning of gravitational wave astronomy, opening a new window to the universe. The necessary high detection sensitivity calls for ultra-stable high-power lasers with outstanding beam quality. The AEI Laser Group (in close collaboration with the Laser Zentrum Hannover (LZH)) is in charge of the development of the pre-stabilised laser system (PSL) for the second generation gravitational wave detector Advanced LIGO and was chosen out of three competing groups based on its experience in the development, stabilisation and operation of GEO600.
