Spatial phase-stepped interferometry using a holographic optical element

Bernardino Barrientos; Andrew John Moore; Carlos Perez-Lopez; L. L. Wang; Theo T. Tschudi

doi:10.1117/1.602313

1 December 1999 Spatial phase-stepped interferometry using a holographic optical element

Bernardino Barrientos, Andrew John Moore, Carlos Perez-Lopez, L. L. Wang, Theo T. Tschudi

Author Affiliations +

Optical Engineering, Vol. 38, Issue 12, (December 1999). https://doi.org/10.1117/1.602313

We describe two new techniques for spatial phase stepping using a computer-generated holographic optical element (HOE). The techniques are implemented with electronic speckle pattern interferometry, although they could be applied to other optical metrology methods. The first technique uses an HOe that introduces a known phase step between the ±1 diffracted orders, without being translated. The interference phase corresponding to object deformation can be calculated from a single TV frame, and the technique is therefore suitable for the measurement of transient deformations. We apply the technique to measure the phase changes caused by refractive index variations in an evolving thermal plume. The second technique requires the HOE to be used in conjunction with a phase grating. In this technique, the HOE and the phase grating are used sequentially for the two exposures required in speckle interferometry (made before and after object deformation) and is therefore suitable for making dynamic deformation measurements with a double-pulsed interferometer. A root mean square (rms) precision of 2?/20 rad for the phase measurements is obtained.

Citation Download Citation

Bernardino Barrientos, Andrew John Moore, Carlos Perez-Lopez, L. L. Wang, and Theo T. Tschudi "Spatial phase-stepped interferometry using a holographic optical element," Optical Engineering 38(12), (1 December 1999). https://doi.org/10.1117/1.602313

Published: 1 December 1999

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

;

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE