Phase retrieval by means of a spatial light modulator in the Fourier domain of an imaging system

Author(s): Claas Falldorf, Mostafa Agour, Christoph v. Kopylow, and Ralf B. Bergmann

Abstract:

“We present an experimental configuration for phase retrieval from a set of intensity measurements. The key component is a spatial light modulator located in the Fourier domain of an imaging system. It performs a linear filter operation that is associated to the process of propagation in the image plane. In contrast to the state of the art, no mechanical adjustment is required during the recording process, thus reducing the measurement time considerably. The method is experimentally demonstrated by investigating a wave field scattered by a diffuser, and the results are verified by comparing them to those obtained from standard interferometry.”

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Publication: Applied Optics
Issue/Year: Applied Optics, Vol. 49, Issue 10, pp. 1826-1830 (2010)
DOI: 10.1364/AO.49.001826

Measuring the Transmission Matrix in Optics: An Approach to the Study and Control of Light Propagation in Disordered Media

Author(s): S. M. Popoff, G. Lerosey, R. Carminati, M. Fink, A. C. Boccara, S. Gigan

Abstract:

“We introduce a method to experimentally measure the monochromatic transmission matrix of a complex medium in optics. This method is based on a spatial phase modulator together with a full-field interferometric measurement on a camera. We determine the transmission matrix of a thick random scattering sample. We show that this matrix exhibits statistical properties in good agreement with random matrix theory and allows light focusing and imaging through the random medium. This method might give important insight into the mesoscopic properties of a complex medium.”

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Publication: Physical Review Letters
Issue/Year: Phys. Rev. Lett., Volume 104, Issue 10, 100601 (2010)
DOI: 10.1103/PhysRevLett.104.100601

Utilization of the phase flicker of a LCoS Spatial Light Modulator for improved diffractive efficiency

Author(s): Karol Kakarenko, Marcin Zaremba, Izabela Ducin, Michał Makowski, Agnieszka Siemion, Andrzej Siemion, Jarosław Suszek, Maciej Sypek, Dariusz Wojnowski, Zbigniew Jaroszewicz, Andrzej Kołodziejczyk

Abstract:

“The paper presents the observation, measurement and utilization of flickering of phase modulation in time on a high-end Liquid Crystal on Silicon (LCOS) Spatial Light Modulator. The flicker due to binary driving electronics is a negative effect, but can be overcome by appropriate adjustment of phase modulation depth, which results in time-synchronization of peak efficiencies for selected wavelengths. In this work optimal parameters for three wavelengths of primary RGB colors are investigated. The effect is optimal performance of the SLM for full-color dynamic holography.”

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Publication: Photonics Letters of Poland
Issue/Year: Photonics Letters of Poland, Vol 2, No 3, P. 128-130 (2010)
DOI: 10.4302/plp.2010.3.11