Holographic three dimensional images of objects can be displayed via a device comprising micro holographic optical elements (MHOEs). A device for displaying holographic three dimensional images of objects can comprise a laser source, a spatial filter using a micro holographic optical element (MHOE) lens, a collimating MHOE lens, a spatial light modulator, and cylindrical MHOE lenses. A holographic three dimensional image of an object can be displayed using MHOEs by emitting a coherent light, filtering and expanding the light, aligning the expanded light, modulating the aligned expanded light, and focusing the modulated light.

 
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> Compact optical amplifier with a flattened gain profile

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