Abstract
New Approach to Generation and Amplification of the THz Radiation in Plasma Created by Intense Two-Color Laser Fields
Highlights
E(t) = f (t) (E cos( t) + E2 cos(2 t)), where the frequency of the Ti-Sa laser and f (t) is the envelope being the same for both pulses
It is known that irradiation of gas by intense two color ( + 2 ) laser pulse results in low-frequency polarization of the medium P ~ (3)E 2 E2 and THz emission [2] which arises from the four-wave mixing (FWM) process ( = '+ ''−2 ''') and in the limit of perturbation theory is governed by the cubic susceptibility (3) ( '+ ''−2 '') ( ', '' are the frequencies from the spectral width of the pulse with frequency ω while ''' is the frequency from the spectral width of second harmonic 2ω.)
In this paper we plan to study low frequency spontaneous background from gas or plasma irradiated by two-color laser field which could be further amplified according to the mechanism proposed in [3]
Summary
It is known that irradiation of gas by intense two color ( + 2 ) laser pulse results in low-frequency polarization of the medium P ~ (3)E 2 E2 and THz emission [2] which arises from the four-wave mixing (FWM) process ( = '+ ''−2 ''') and in the limit of perturbation theory is governed by the cubic susceptibility (3) ( '+ ''−2 '') ( ', '' are the frequencies from the spectral width of the pulse with frequency ω while ''' is the frequency from the spectral width of second harmonic 2ω.). In this paper we plan to study low frequency spontaneous background from gas or plasma irradiated by two-color laser field which could be further amplified according to the mechanism proposed in [3].
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