Compensation of wavelength dependent image shifts in imaging optical interferometry
In modern interferometers for absolute length measurements, when applying phase stepping interferometry, several different wavelengths are used as light sources, and the interferogram is projected to a CCD-camera array. Such interferometers are equipped with wedged optical components as windows and beam splitters, to prevent additional interferences. The wedged optics causes the position of a test piece within the interferogram related to the camera pixel coordinates to be dependent on the wavelength used. This effect depends on the wedge angles and the thicknesses of optical components as well as on their distances within the interferometer's optical pathway. We give a quantitative analysis and suggest a compensation of this dispersion effect by an additional wedge plate outside the interferometer.
- OSTI ID:
- 21013773
- Journal Information:
- Applied Optics, Vol. 46, Issue 30; Other Information: DOI: 10.1364/AO.46.007464; (c) 2007 Optical Society of America; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6935
- Country of Publication:
- United States
- Language:
- English
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