Abstract
We demonstrate holographic recording without speckle noise using the digital holographic technique called optical scanning holography (OSH). First, we record a complex hologram of a diffusely reflecting (DR) object using OSH. The incoherent mode of OSH makes it possible to record the complex hologram without speckle noise. Second, we convert the complex hologram to an off-axis real hologram digitally and finally we reconstruct the real hologram using an amplitude-only spatial light modulator (SLM) without twin-image noise and speckle noise. To the best of our knowledge, this is the first time demonstrating digital holographic recording of a DR object without speckle noise.
Highlights
Digital holographic imaging has a long standing history [1,2,3,4] and holographic display systems based on computer-generated holography (CGH) have been proposed for 3D display [5,6,7,8,9]
These features make up the incoherent mode of operation of optical scanning holography (OSH) [16] and make it possible to generate a complex hologram of a diffusely reflecting (DR) object without speckle noise, which we demonstrate in this paper
We have recorded a complex hologram of a diffusely reflecting (DR) object using optical scanning holography (OSH) operating in the incoherent mode of operation. This shows that using OSH, we can record the hologram of a DR object without speckle noise which has been a severe drawback of 3D digital holographic imaging
Summary
Digital holographic imaging has a long standing history [1,2,3,4] and holographic display systems based on computer-generated holography (CGH) have been proposed for 3D display [5,6,7,8,9]. In OSH, a DR object is scanned by a time-dependent Fresnel zone pattern (interfering between a spherical wave and a plane wave of different temporal frequencies) and the reflected light from the DR object is detected by a spatially integrating photo-detector tuned to the difference between the different temporal frequencies. These features make up the incoherent mode of operation of OSH [16] and make it possible to generate a complex hologram of a DR object without speckle noise, which we demonstrate in this paper. In the optical reconstruction stage, the off-axis hologram is reconstructed using an amplitude-only spatial light modulator (SLM)
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