Abstract-Generation of a terahertz collimated top-hat beam by using two thin diffractive phase plates

Xi Ye, Feidi Xiang, Chengwu You, Kejia Wang, Zhengang Yang, Jinsong Liu, and Shenglie Wang

Fig. 1 Configuration of THz top-hat beam shaping system with two optical elements, (a). 3D-printed refractive aspheric lenses, (b). 3D-printed diffractive phase plates.

https://www.osapublishing.org/osac/abstract.cfm?uri=osac-1-4-1341

We propose an efficient approach for shaping a terahertz (THz) Gaussian beam to a collimated top-hat beam by using two thin diffractive phase plates. The phase plates are designed based on the phase retrieve algorithm and fabricated by well-developed 3D-printing technology. The designed THz top-hat beam is experimentally realized at 0.3-THz. Both the calculated root mean square (RMS) uniformity and fraction of the total beam power of the output top-hat beam are over 80%, respectively. Additionally, the comparison between our approach and the traditional system containing of two refractive aspheric lenses is performed, showing that our beam shaping system has higher energy utilization.

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