Analysis of the Disturbing Diffraction Orders of Computer-Generated Holograms Used for Testing Optical Aspherics
Applied Optics, Vol. 40, Issue 16, pp. 2698-2708 (2001)
http://dx.doi.org/10.1364/AO.40.002698
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Abstract
Aspheric surfaces are increasingly used in the design of high-quality optical imaging systems. Therefore accurate testing methods for aspherics are also necessary. One possibility is to use a computer-generated hologram (CGH) as a part of a null lens in an interferometric testing device. However, CGHs normally have more than one diffraction order, thus causing disturbing areas in the interferogram. Here a simple approximative analytical expression is given for the spatial frequencies of the disturbing light in the interferogram coming from the different diffraction orders of the CGH. This expression also enables one to calculate the size and the shape of the disturbing areas in the interferogram. Some design examples for CGHs are given in an application of the expression.
© 2001 Optical Society of America
[Optical Society of America ]
OCIS Codes
(050.1970) Diffraction and gratings : Diffractive optics
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.6650) Instrumentation, measurement, and metrology : Surface measurements, figure
(220.1250) Optical design and fabrication : Aspherics
(220.4830) Optical design and fabrication : Systems design
(220.4840) Optical design and fabrication : Testing
Citation
Norbert Lindlein, "Analysis of the Disturbing Diffraction Orders of Computer-Generated Holograms Used for Testing Optical Aspherics," Appl. Opt. 40, 2698-2708 (2001)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-40-16-2698
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