Effect of laser light on matter. Laser plasmas

Effect of electron–ion collisions on the spectrum of THz radiation from a plasma in a magnetic field exposed to a femtosecond laser pulse

K. N. Ovchinnikov

P. N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow

Abstract: We examine the effect of electron–ion collisions on the generation of THz radiation from a magnetoactive plasma exposed to a femtosecond laser pulse when the laser frequency exceeds that of the plasma. The frequency ranges for which collisions must be taken into account are identified. The total energy of low-frequency radiation is found to reduce down to 30% due to collisions in the most interesting case for generation, where the laser pulse duration is on the order of the inverse plasma frequency.

Keywords: THz radiation, femtosecond laser pulse, magnetoactive plasma, electron–ion collisions, ponderomotive potential.

Received: 29.11.2024
Revised: 17.04.2025
Accepted: 25.04.2025

 English version: Quantum Electronics, 2025, 52:suppl. 5, S510–S519