Patent ID: 6989906
Filing Date: 2006-01-24
Classification: G01B,G01J

Abstract:
1. A combination for stabilizing the operation of a Fabry-Perot interferometer comprising: a Fabry-Perot interferometer having two plane mirrors with optical surfaces arranged parallel to one another and with a preselected optical distance between the optical surfaces of the mirrors; a first device for inputting a light input signal to the interferometer applied parallel to the optical axis of the interferometer whereupon an output light signal will be radiated in response thereto; a second device for directing a plurality of reference light beams to the interferometer being parallel to each other and inclined at a preselected angle to the optical axis of the interferometer to one of transmit therethrough or reflect therefrom at different points distributed regularly over the surface of the mirrors and without affecting the light input signal applied parallel to the optical axis of the interferometer and the output light signal radiated in response thereto; and a third device for receiving the reference light beams after they have been one of transmitted through or reflected from the interferometer, and stabilizing the optical distance of the mirrors of the interferometer responsive to the intensity of the received reference light beams.