title: Photorefractive two-wave mixing for image amplification in digital holography.
abstract: We use photorefractive two-wave mixing for coherent amplification of the object beam in digital holographic recording. Both amplitude and phase reconstruction benefit from the prior amplification as they have an increased SNR. We experimentally verify that the amplification process does not affect the phase of the wavefield. This allows for digital holographic phase analysis after amplification. As the grating formation in photorefractive crystals is just driven by coherent light, the crystal works as a coherence gate. Thus the proposed combination allows for applying digital holography for imaging through scattering media, after the image bearing light is coherence gated and filtered out of scattered background. We show experimental proof-of principle results.
authors: Photonics and Terahertz-Technology, Ruhr-University Bochum, Universitätsstr. 150, 44780 Bochum, Germany. Nektarios.Koukourakis@rub.de
authors: Nektarios
authors: N
authors: Koukourakis
authors: Tarek
authors: T
authors: Abdelwahab
authors: Ming Yuan
authors: MY
authors: Li
authors: Henning
authors: H
authors: Höpfner
authors: Yiu Wai
authors: YW
authors: Lai
authors: Emmanouil
authors: E
authors: Darakis
authors: Carsten
authors: C
authors: Brenner
authors: Nils C
authors: NC
authors: Gerhardt
authors: Martin R
authors: MR
authors: Hofmann