Zeroth-order phase-contrast technique
Applied Optics, Vol. 46, Issue 31, pp. 7604-7613 (2007)
http://dx.doi.org/10.1364/AO.46.007604
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Abstract
What we believe to be a new phase-contrast technique is proposed to recover intensity distributions from phase distributions modulated by spatial light modulators (SLMs) and binary diffractive optical elements (DOEs). The phase distribution is directly transformed into intensity distributions using a 4f optical correlator and an iris centered in the frequency plane as a spatial filter. No phase-changing plates or phase dielectric dots are used as a filter. This method allows the use of twisted nematic liquid-crystal televisions (LCTVs) operating in the real-time phase-mostly regime mode between 0 and p to generate high-intensity multiple beams for optical trap applications. It is also possible to use these LCTVs as input SLMs for optical correlators to obtain high-intensity Fourier transform distributions of input amplitude objects.
© 2007 Optical Society of America
OCIS Codes
(070.0070) Fourier optics and signal processing : Fourier optics and signal processing
(070.2580) Fourier optics and signal processing : Paraxial wave optics
(070.6020) Fourier optics and signal processing : Continuous optical signal processing
(070.6110) Fourier optics and signal processing : Spatial filtering
ToC Category:
Fourier Optics and Signal Processing
History
Original Manuscript: March 15, 2007
Revised Manuscript: August 16, 2007
Manuscript Accepted: September 10, 2007
Published: October 22, 2007
Virtual Issues
Vol. 2, Iss. 12 Virtual Journal for Biomedical Optics
Citation
José Carlos Pizolato Jr., Giuseppe Antonio Cirino, Cristhiane Gonçalves, and Luiz Gonçalves Neto, "Zeroth-order phase-contrast technique," Appl. Opt. 46, 7604-7613 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-31-7604
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