The desirability of using confocal cavities in scanning interferometers is discussed and a method for fabricating such cavities is described. This method makes use of the fact that in a confocal cavity the minimum spot size, and hence the extent of any combination of cavity modes, is stationary with respect to small changes in the cavity length. A method for reducing wedge in the cavity to small values is also presented. Tolerances are discussed and performance figures for two interferometers produced this way are given.
© 1967 Optical Society of America
Original Manuscript: June 2, 1967
Published: November 1, 1967
John R. Johnson, "A Method for Producing Precisely Confocal Resonators for Scanning Interferometers," Appl. Opt. 6, 1930-1933 (1967)