Working principle of coherent artifacts suppression by coherence tuning (IMAGE)

Light Publishing Center, Changchun Institute of Optics, Fine Mechanics And Physics, CAS

Working principle of coherent artifacts suppression by coherence tuning

Caption

Illustration of the tunable laser source, meta-hologram and projected holographic images.The laser is tuned by gradually translating a single lens inside the laser cavity (dashed circle), allowing to precisely control the laser beam coherence. The beam is focused by an imaging system to a meta-surface hologram (dotted circle) that shapes the beam into an image of a star (solid circle). When the in-cavity lens is translated to position (i) a single mode lases inside the cavity, producing a degraded image full of artifacts due to coherent interference [inset (i)]. When the lens is set to position (ii), the laser is tuned to produce an optimized amount of modes, leading to a holographic image that contains very little artifacts while maintaining its sharp details [inset (ii)].

Credit

by Yaniv Eliezer, Geyang Qu, Wenhong Yang, Yujie Wang, Hasan Yilmaz, Shumin Xiao, Qinghai Song and Hui Cao

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