Lowering spatial frequency by using two confocal lenses in digital holography

Sung-kyu Kim; Hyun-Hee Choi; Jung-Young Son

doi:10.1117/12.473797

4 June 2003 Lowering spatial frequency by using two confocal lenses in digital holography

Sung-kyu Kim, Hyun-Hee Choi, Jung-Young Son

Proceedings Volume 5005, Practical Holography XVII and Holographic Materials IX; (2003) https://doi.org/10.1117/12.473797
Event: Electronic Imaging 2003, 2003, Santa Clara, CA, United States

Abstract

One of the main problems in practical application of digital holography is that the unit cell size of CCD(Charge-Coupled Device) is too large. As a result, the object size of recording of interference pattern to CCD is very limited. The angle of incoming laser light ray is reduced by the ratio of two focal lengths of two confocal lenses. This induces the spatial frequency of interference pattern to be lower. So the higher spatial frequency of interference pattern than the spatial frequency determined by the unit cell size of CCD, can be recorded. By using confocal lenses optical setup, a merit can be achieved like that the area of the 0-th order diffraction light is reduced to the square of the ratio of two focal lengths at numerical reconstruction. As a result, numerical reconstruction for larger object size compared with CCD only case, is calculated by using FFT(Fast Fourier Transform) adapted to the integral came from Huygens-Fresnel principle. The needed diameters of two confocal lenses and the position of CCD camera are calculated for recoding the interference pattern of larger object size.

Citation Download Citation

Sung-kyu Kim, Hyun-Hee Choi, and Jung-Young Son "Lowering spatial frequency by using two confocal lenses in digital holography", Proc. SPIE 5005, Practical Holography XVII and Holographic Materials IX, (4 June 2003); https://doi.org/10.1117/12.473797

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KEYWORDS

Charge-coupled devices

Lenses

Confocal microscopy

Digital holography

Spatial frequencies

Reconstruction algorithms

CCD cameras

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