A novel technique has been demonstrated for the generation of intense terahertz electromagnetic wave that enables high-field near-single-cycle terahertz (THz) pulse via non-collinear χ⁽²⁾ process in LiNbO₃ with both phase-front and spectral angular dispersion. Using this technique we are able to generate a single cycle (broadband) terahertz pulse up to an electric field of 750 kV/cm. We have also demonstrated the potential of this intense THz pulse for 3D THz imaging, which is 13-times higher than that of previous system based on collinear optical rectification in ZnTe crystal. The main advantage of the proposed method relies on real-time THz line projection providing 10 ms acquisition time of 2D-ST THz image. Therefore, 3D THz CT has been performed in only 6 minutes, representing a significant improvement compared with common systems. Finally, demonstration of 3D images clearly indicated a high potential for sensing, non-destructive inspection and material characterization in real world applications.

Dr. Mukesh Jewariya received his M.Sc. in Physics from IIT Roorkee in 2003, M.Tech. in Laser Technology from Devi Ahilya Vishwavidyalaya, Indore, in 2006, and D.Sc. in Physics from Kyoto University, Japan, in 2010. Following his doctoral studies, he held research and academic positions at Osaka University and The University of Tokushima, Japan, and later served as a Visiting Scientist at the Korea Atomic Energy Research Institute (KAERI), South Korea. Since 2012, he has been working as a Senior Scientist at CSIR–National Physical Laboratory (CSIR-NPL), New Delhi. He is a recipient of the Monbukagakusho Fellowship (Japan), JSPS KAKENHI Fellowship, and Korean Research Fellowship. Dr. Jewariya has published more than 73 research articles, 5 book chapters, and over 100 conference papers. He serves on the editorial boards of several international journals and regularly reviews manuscripts for leading journals, including Physical Review Letters, Physical Review B, JOSA A, JOSA B, and Optics Letters. His research interests include terahertz (THz) science and technology, encompassing high-power THz pulse generation, THz spectroscopy and imaging, THz frequency metrology, dimensional and length metrology, THz detector materials, and ultrafast spectroscopy. His current research focuses on realizing the SI unit metre using quantum standards based on optical frequency combs. He currently serves as the Mission Coordinator of the National Terahertz Mission and is also the Nodal Officer for the Skill India Programme at CSIR-NPL.