Design considerations for low-light level low-Fresnel number optical systems
Applied Optics, Vol. 48, Issue 32, pp. 6259-6263 doi:10.1364/AO.48.006259
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- OCIS Codes:
- (050.1940) Diffraction and gratings : Diffraction
- (350.3950) Other areas of optics : Micro-optics
- (080.2468) Geometric optics : First-order optics
Diffraction and Gratings
Citation
Christoph Baranec, "Design considerations for low-light level low-Fresnel number optical systems," Appl. Opt. 48, 6259-6263 (2009)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-48-32-6259
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Low-Fresnel number optical systems exhibit significant diffraction effects that cause a shift in the peaks of on-axis irradiance away from the geometric focal point. This is currently interpreted as a change of the focal length of an optical system, leading optical system designers to compensate for the effect by assuming the image plane is coincident with the peak of on-axis irradiance. While this may be an appropriate interpretation for certain applications, I show that despite the shift in peak irradiance away from the geometrical focal point, a change in a system's optical power will not increase the on-axis irradiance at that distance. This is important for low-light level applications where it is necessary to mitigate diffraction induced transmission losses. I also show that low-Fresnel number systems have increased tolerance on system power at the geometrical focal point and as a result are inherently achromatic.
© 2009 Optical Society of America
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History
Original Manuscript: September 3, 2009
Manuscript Accepted: October 7, 2009
Published: November 4, 2009
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Author Affiliations
Caltech Optical Observatories, California Institute of Technology, 1200 East California Boulevard, Pasadena, California 91125, USA; baranec@astro.caltech.edu
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