▎ 摘　　要

NOVELTY - An adjustable terahertz radiation source comprises light source, first lens (2) and liquid crystal box (3). The liquid crystal box comprises first base plate (4), first photo-alignment layer (5), liquid crystal layer (6), second photo-alignment layer (7), graphene (8) and second base plate (9). The light source outputs femtosecond laser. The first lens is focused on liquid crystal box for generating terahertz wave. USE - The adjustable terahertz radiation source based on femtosecond laser induced liquid crystal is used for safety inspection, biological medicine, non-destructive detection and high speed communication fields. ADVANTAGE - The terahertz wave peak electric field intensity linearly changes with the pump light power. By adding electric field to the liquid crystal box, generating intensity, phase, and polarization can be adjusted. The second substrate uses a hemispherical structure, better realizing light beam focusing, no need to additionally place the lens. The liquid crystal layer is made of the material with double refractive index in the tera hertz wave band, at the same time, it has higher second order nonlinear coefficient. The first substrate is silicon dioxide integrated graphene or ITO glass and so on to femtosecond laser with high transmittance. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of adjustable terahertz radiation source based on femtosecond laser induced liquid crystal. First lens (2) Liquid crystal box (3) First base plate (4) First photo-alignment layer (5) Liquid crystal layer (6) Second photo-alignment layer (7) Graphene (8) Second base plate (9)