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http://dx.doi.org/10.3807/KJOP.2013.24.6.318

Aspheric Lens Measurements by Digital Holographic Microscopy and Liquid  

Kim, Doocheol (Department of Physics, Cheju National University)
Shin, Sanghoon (KPS)
Yu, Younghun (Department of Physics, Cheju National University)
Publication Information
Korean Journal of Optics and Photonics / v.24, no.6, 2013 , pp. 318-323 More about this Journal
Abstract
Digital holographic microscopy allows optical path difference measurement. Optical path difference depends on both the refractive index and the morphology of the sample. When interference fringes are very closely spaced, the phase data contain high frequencies where $2{\pi}$ ambiguities cannot be resolved. The immersion testing method, which is a transmission test while the sample is immersed in liquid, is very effective in reducing high frequency fringes in transmission measurements so that large dynamic range testing is possible for a non-null configuration. We developed a digital holographic microscope using liquid that can measure the high numerical aperture aspheric morphology of a sample. This system provides highly precise three-dimensional information on the sample. By improving the experimental method, choosing liquids which have similar refractive index to the sample, we can measure more accurate three-dimensional information on the samples.
Keywords
Holography; Digital holography; Aspheric lens;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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