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14 September 1994 Advance of the design and technology of birefringent filters
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Practical aspects of constructing very wide-field of view elements of Lyot Birefringence Filters (LBF) using the new Te02 and PbMoO4 crystals are discussed. The field of view exceeds that of the Halle and Zeiss LBF designs that use wide field elements based on half-wave plates. The combination of the new crystals between themselves and with calcite provides a possibility of constructing wide angle Solc filters covering a rather large spectral range. Because of the required tight tolerances on the parameters of the wave plates new methods and an optical system have been developed to orientate a crystallographic axis in the elements and control the thickness and parallelism of the element surfaces during finishing. The optical system set up on a polishing machine and the mirror installed under the polishing tool allow direct interferometric measurement of retardation and parallelism of the crystal plate during the polishing process. Details of these methods and the optical conoscope are discussed. Examples of the performance of the new wide-field elements are presented.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Valery I. Skomorovsky "Advance of the design and technology of birefringent filters", Proc. SPIE 2265, Polarization Analysis and Measurement II, (14 September 1994);

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