30 August 2006 Experimental synthesis of general complex fields using an amplitude modulator
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Abstract
In this work we present the experimental synthesis of fully complex fields employing computer generated holograms, implemented with an amplitude liquid-crystal spatial light modulator (SLM). The hologram transmittance is obtained by adding an appropriate bias function to the real cosine computer hologram of the encoded signal. The effect of finite pixel size in the SLM is compensated by digital pre-filtering of the encoded complex signal. For the purpose of this work, we consider an appropriated bias function for a modulator in which the amplitude transmittance is coupled with a linear phase modulator. This type of coupled phase appears in a commercial Twisted Nematic Liquid Crystal Display (TNLCD), configured to provide amplitude modulation, with only two polarizers as external components. We employ a commercial TNLCD to generate experimentally Laguerre-Gauss beams and non-diffracting Bessel beams of several orders.
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Rodrigo Ponce-Díaz, Rodrigo Ponce-Díaz, Victor Arrizón, Victor Arrizón, Julio C. Gutierrez-Vega, Julio C. Gutierrez-Vega, Alfonso Serrano-Heredia, Alfonso Serrano-Heredia, } "Experimental synthesis of general complex fields using an amplitude modulator", Proc. SPIE 6311, Optical Information Systems IV, 63110D (30 August 2006); doi: 10.1117/12.681388; https://doi.org/10.1117/12.681388
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