Here we'll list and describe ideas for testing 3rd generation (i.e., beyond Advanced LIGO) interferometric techniques at the 40m.
- Multi-color (multi-springy) interferometers (maybe this is only 2.5G)
- Sloshing cavities
- Long signal cavities
- speed-meter interferometers
- injecting squeezed vacuum
- VRSM
- super-seismic cancellation (feed-forward from seismometers, gravity gradient cancellation)