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Refractive Index Distribution Measurement of an Optical Component by Using Digital Holography
New Phys.: Sae Mulli 2017; 67: 1393~1398
Published online November 30, 2017;
© 2017 New Physics: Sae Mulli.

Silin NA, Younghun YU*

Department of Physics, Jeju National University, Jeju 63243, Korea
Correspondence to:
Received September 8, 2017; Revised October 9, 2017; Accepted October 10, 2017.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
We developed a dual-wavelength digital holographic method (DHM) that was able to measure the refractive index distribution of samples without requiring shape information. This system provides highly precise three-dimensional (3-D) information. We propose a new experimental method and models for determining the refractive index distribution by using a transmission dual-wavelength DHM without requiring shape information on the sample. The proposed method involves recording holograms at different wavelengths and numerically reconstructing the phase information of the sample by using a two-dimensional Hilbert transformation (2-D HT). This method is applicable to normal-transmission interferometry to determine the refractive index distribution of transmitting optical components.
PACS numbers: 42.40.Kw, 42.30.Rx, 42.30.Wb
Keywords: Refractive index, Digital holographic microscopy, Hilbert transform

March 2018, 68 (3)
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