A white-light Fizeau interferometer is described. Commonly, white-light fringes can be produced only by using a virtual wedge instrument such as a Michelson interferometer. By use of a series arrangement of a Fabry–Perot interferometer in front of a two-beam Fizeau interferometer, white-light fringes can be produced. For white-light fringes to be obtained, the thickness of the air gap between the Fizeau plates has to be adjusted to the same thickness as the air gap between the Fabry–Perot plates (or in more general terms to a rational multiple of this value). The contrast of the two-beam type of Fizeau fringes depends on the reflectivity of the Fabry–Perot plates.
© 1997 Optical Society of America
Original Manuscript: March 25, 1996
Revised Manuscript: May 22, 1996
Published: March 1, 1997
J. Schwider, "White-light Fizeau interferometer," Appl. Opt. 36, 1433-1437 (1997)