Submillimeter Radiation Production Using Two Unidentical Lasers in Hot Collisional Plasma

In this study, we investigate the generation of submillimeter radiation which lies in terahertz (THz) frequency range using two unidentical laser profiles in a hot, collisional, corrugated plasma. Utilizing a beat scheme methodology, we achieve resonance conditions that significantly enhance the THz-field amplitude. The novelty of our approach lies in leveraging the thermal velocity of electrons to mitigate collisional effects by increasing plasma nonlinearity and creating nonequilibrium state of plasma by application of external field that amplifies the THz field. Furthermore, the applied external periodic electrostatic field not only serves to enhance the THz radiation amplitude but also provides an additional tuning parameter in this scheme. Our findings reveal a 38% enhancement in efficiency when thermal velocity varying from 0% to 20% of <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</i> (speed of light). This enhancement is observed in both the beat-induced mechanisms and the coupling mechanism of individual lasers with external electrostatic field.