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Spatial dispersion of intense terahertz generation in lithium niobate
Author(s): Shusu Chai; Xiaojun Wu; Jinglong Ma; Baolong Zhang; Liming Chen; Yutong Li
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Paper Abstract

Tilted pulse front technique in lithium niobate has been widely used for strong-field terahertz generation in laboratories and with this method, lots of strong terahertz field induced phenomena have been observed. However, for mJ-level pulse energy, focused electric field >10 MV/cm solid state terahertz sources, there are still many scientific and technical challenges waiting to be explored. For real applications, the properties of intense terahertz source is very important, such as spatial chirp effect. In this work, we systematically investigate the spatial dispersion of intense terahertz generation process in lithium niobate. We also observe obvious non-uniform spatial terahertz frequency distribution with respect to the emission plane using a knife-edge measurement. Higher frequency generation is obtained when the emission spot is far away from the cutting edge of the crystal, while lower frequency emission is detected when the emission spot is close to the crystal edge. This phenomenon is contrary to the original predicts, of which higher frequencies will experience longer propagation distance resulting in weak contribution. The possible mechanism is the nonlinear distortion effect caused by high energy laser pumping. Our study is very important and useful for building intense terahertz systems with the applications in extreme terahertz science, and time-resolved nonlinear spectroscopy.

Paper Details

Date Published: 9 November 2018
PDF: 5 pages
Proc. SPIE 10826, Infrared, Millimeter-Wave, and Terahertz Technologies V, 108261M (9 November 2018); doi: 10.1117/12.2502421
Show Author Affiliations
Shusu Chai, Beihang Univ. (China)
Xiaojun Wu, Beihang Univ. (China)
Jinglong Ma, Institute of Physics (China)
Baolong Zhang, Institute of Physics (China)
Liming Chen, Institute of Physics (China)
Yutong Li, Institute of Physics (China)


Published in SPIE Proceedings Vol. 10826:
Infrared, Millimeter-Wave, and Terahertz Technologies V
Cunlin Zhang; Xi-Cheng Zhang; Masahiko Tani, Editor(s)

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