41. No fewer than seven interferometers have been located here. 42. Interferometers are at the core of gravitational wave detectors.43. Both mirrors in a Michelson interferometer can be replaced with Gires Tournois etalons. 44. Schematic representation of the frequency shift when a ring laser interferometer is rotating. 45. Gires Tournois etalon has applications for laser pulse compression and nonlinear Michelson interferometer . 46. An example of an optical intensity interferometer is the Narrabri Stellar Intensity Interferometer. 47. An example of an optical intensity interferometer is the Narrabri Stellar Intensity Interferometer . 48. The use of interferometers has become a standard method of testing optical surfaces. 49. Virgo is a 3 kilometer interferometer built through a French-Italian collaboration. 50. To start with, Virgo is a Michelson interferometer whose mirrors are suspended.
