Media type: E-Article Title: A Model of Terahertz Parametric Process Including Spontaneous Parametric Down-conversion Contributor: Qin, Yu; Li, Zeyu; Yan, Qiang; Zhou, Xun; Zou, Mingrui; Kong, Weipeng imprint: Springer Science and Business Media LLC, 2021 Published in: Journal of Infrared, Millimeter, and Terahertz Waves Language: English DOI: 10.1007/s10762-021-00778-7 ISSN: 1866-6892; 1866-6906 Keywords: Electrical and Electronic Engineering ; Condensed Matter Physics ; Instrumentation ; Radiation Origination: Footnote: