[19p-E215-1~17] 4.5 Terahertz Photonics

▲ [19p-E215-1] [INVITED] Terahertz Pulses with High-Field Unipolar Precursors

〇Michael Bakunov¹, Maxim Tsarev² (1.Nizhny Novgor. Univ., 2.Ludwig-Maxim.-Univ.)

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.