Digital holographic interference analysis using a 2-step phase-shifting technique

Sang Keun Gil; Seok Hee Jeon; Jong Rae Jeong

doi:10.1117/12.764362

25 January 2008 Digital holographic interference analysis using a 2-step phase-shifting technique

Sang Keun Gil, Seok Hee Jeon, Jong Rae Jeong

Proceedings Volume 6912, Practical Holography XXII: Materials and Applications; 69121B (2008) https://doi.org/10.1117/12.764362
Event: Integrated Optoelectronic Devices 2008, 2008, San Jose, California, United States

Abstract

We propose a digital holographic interference analysis method based on 2-step phase-shifting technique for measuring optical surface. The technique using 2-step phase-shifting digital interferometry is more efficient than multi-step phase-shifting techniques because 2-step method has an advantage of the reduced number of interferograms. In this measurement system, 2-step phase-shifting digital interferograms are acquired by moving the reference flat mirror surface which is attached to PZT with phase step of 0 or π/2 in the reference beam path and are recorded on CCD device. The optical interferometry is designed on the basis of polarization characteristics of polarizing beam splitter. Therefore the noise from outside turbulence can be decreased. The proposed 2-step algorithm uses the relative phase difference of the neighbor pixels. Experiment has been carried out on the optical mirror. The measurement of the optical mirror surface topography shows that the result using 2-step algorithm is similar to that of other multi-step algorithms. Thus, the proposed method is expected to be used in nondestructive testing of optical components.

Citation Download Citation

Sang Keun Gil, Seok Hee Jeon, and Jong Rae Jeong "Digital holographic interference analysis using a 2-step phase-shifting technique", Proc. SPIE 6912, Practical Holography XXII: Materials and Applications, 69121B (25 January 2008); https://doi.org/10.1117/12.764362

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KEYWORDS

Phase shifts

Digital holography

Mirrors

Ferroelectric materials

Holographic interferometry

Charge-coupled devices

Holography

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