Speckle suppression and error reduction by synthesis and display of multiple kinoforms with sparsed image implementing dummy-area technique

Pavel A. Cheremkhin; Nikolay N. Evtikhiev; Vitaly V. Krasnov

doi:10.1117/12.2319600

7 September 2018 Speckle suppression and error reduction by synthesis and display of multiple kinoforms with sparsed image implementing dummy-area technique

Pavel A. Cheremkhin, Nikolay N. Evtikhiev, Vitaly V. Krasnov

Author Affiliations +

Proceedings Volume 10834, Speckle 2018: VII International Conference on Speckle Metrology; 108341Z (2018) https://doi.org/10.1117/12.2319600
Event: SPECKLE 2018: VII International Conference on Speckle Metrology, 2018, Janów Podlaski, Poland

Abstract

Kinoform is a synthesized phase diffractive optical element which allows to reconstruct image by its illumination with plane wave similarly to hologram. Unlike hologram however, kinoform forms only one diffraction order containing reconstructed image. There is no analytical solution to kinoform synthesis problem; various iterative methods providing relatively small synthesis error are used instead. However, with limitation on quantity of addressable phase levels this error becomes significant. Another factor affecting reconstructed image quality is speckle-noise inherent to coherent illumination. There is common solution to speckle-noise problem – repetition of kinoform or hologram several times along each dimension in order to reduce size of image pixels so that they do not overlap with each other. This greatly reduces amount of speckle-noise, but leads to formation of grain structure in resulting image. We eliminate this disadvantage by synthesizing several kinoforms with sparsed image. In each case image is shifted relative to previous one. So that when all kinoforms are sequentially displayed on spatial light modulator with sufficiently high frequency, reproduced images merge into one. Resulting image is relatively speckle-free and does not have grain structure. Furthermore, because each individual kinoform has vast amount of free dark space, it can be used to dump synthesis noise similar to dummy-area technique but with free space between informative pixels. Results of optical experiments are presented.

Citation Download Citation

Pavel A. Cheremkhin, Nikolay N. Evtikhiev, and Vitaly V. Krasnov "Speckle suppression and error reduction by synthesis and display of multiple kinoforms with sparsed image implementing dummy-area technique", Proc. SPIE 10834, Speckle 2018: VII International Conference on Speckle Metrology, 108341Z (7 September 2018); https://doi.org/10.1117/12.2319600

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

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
6 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Computer generated holography

Speckle

Diffractive optical elements

Diffraction

Spatial light modulators

Holograms

Image quality

Show All Keywords

Keywords/Phrases

Search In:

Publication Years