Forward Raman compression via photonic band gap in metals or warm dense matter

Abstract

The group velocity of a light pulse in photonic band gap material could considerably deviate from the speed of light in vacuum. A forward stoke and a pump pulse of different speeds would enable the Raman compression in metals or the warm dense matter. A small window of the parameter regime, where the compression is feasible via the forward Raman scattering, is identified.

Two-stream instabilities in degenerate quantum plasmas

“…We also have shown that the unstable Langmuir wave due to the two-stream instability can have the frequency as large as 1.7 ω pe , which is impossible in the classical plasmas. Theses findings in this paper can have major implications on the Backward Raman scattering [15][16][17][18][19][20][21][22] and the beam stopping by the dense background plasmas.…”

Backward Raman scattering in a relativistic electron beam and intense THz light

“…An estimation of the energy conversion efficiency of the pump to the seed pulse is as follows. Practical applications of the BRS compression of the visible-light lasers have demonstrated that a significant portion of the pump energy can be converted to the seed pulse [23,[26][27][28][29][30]. Denote the total energy of the pump laser by E p0 , which becomes E p1 = E p0 /2γ 0 in the co-traveling frame, and denote the conversion efficiency in the co-traveling frame by ǫ 1 .…”

THz radiation from two-colored lasers: Non-linear convection

“…The non-linear theory of the laser interaction in plasmas have been developed in the laser-plasma physics community for a few decades because of the relevance to the inertial confinement fusion [2], including the backward (forward) Raman (Brillouin) scattering [3][4][5][6][7]. When everything is co-propagating, the forward Raman scattering (FRS) is the appropriate physics.…”

“…More interesting ones are the third term on the right side of Eqs. (3), (4) and (5). They represents actual non-linear channeling between the lasers and THz light.…”