Terahertz waves have shown great application potential in many fields, but they are limited by modulation devices. Currently, the dynamic modulator based on optical controlled devices show better performance, but is still far away from the actual application. In this work, a THz SLM system based on bare silicon wafers pumping with a continuous wave laser is built, the modulation performance on different thickness of the wafer and different pumping energy is analyzed. Over 80% modulation depth can be obtained at a pump power density of 2.5W/cm2. The modulation of structured patterns can also be implemented in our system.
KEYWORDS: 3D displays, Spatial light modulators, Holography, Multiplexing, Holograms, Displays, 3D image reconstruction, 3D image processing, Time division multiplexing, Modulation
Holography is considered to be the ultimate solution for 3D display, because which can provide realistic 3D perception and solve the dizziness and fatigue symptoms. The full-color holographic 3D display system usually requires 3 SLMs, which will result in a large, expensive and complex display system. To solve such problems, numerous research works for full-color display using single SLM are proposed. In this work, a series of such methods are surveyed, such as the time division multiplexing, spatial division multiplexing, frequency division multiplexing method, etc. The principles of such methods are explained and the characteristic will also be discussed.
Holographic AR display is an augmented reality display technology with important application prospects for its ability of real 3D display. In this project, the feasibility of AR holographic display is analyzed by the information quantity conservation of optical imaging system. And an AR display system with free-form lens as combiner is designed and carried out based on LED illumination. The light emitted by the LED is collimated by a lens, and then partially reflected by the beam splitter to illuminate the LCOS. The diffracted light modulated by hologram on LCOS is filtered by a 4f optical system and reflected into free-form lens combiner by a mirror for augment reality display. Optical experiments show that the proposed system can achieve high quality imaging at different depth without speckle noise.
A single SLM full-color holographic 3-D display based on sampling and selective frequency-filtering methods is proposed. Sampled R, G and B-holograms provide periodic 3×3 arrays of their frequency spectrums. By allocating three groups of three spectrums to each color hologram, and selectively filtering out those spectrums with their own spectrum filtering masks, frequency-filtered R, G and B-holograms can be obtained. These holograms are then multiplexed into a single hologram and reconstructed into a full-color 3-D image on a 4-f lens system. With the Fourier-optical analysis and experiments with 3-D objects the feasibility of the proposed system is finally confirmed.
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