12:45 PM - 1:15 PM
▲ [19p-E215-1] [INVITED] Terahertz Pulses with High-Field Unipolar Precursors
Keywords:terahertz, optical rectification, unipolar
An ultrashort laser pulse undergoing optical rectification and multiphoton absorption in an electro-optic crystal can generate quasistatic electromagnetic fields (DC precursor) propagating ahead of the pulse. We propose a way to enhance the precursor’s fields by orders of magnitude by using tilted-pulse-front excitation scheme and higher orders of multiphoton absorption. For example, the electric and magnetic fields as high as 0.4 MV/cm and 0.13 T can be generated in a 5-mm-thick LiNbO3 crystal by a pulse (500 fs, 70 GW/cm2) from Yb-doped laser amplifier.