On the possibility of inversion-free amplification of light by dichroic molecules in an external orienting field

Abstract

The possibility of inversion free amplification of light by dichroic molecules that can be oriented selectively over states by application of an external field is analyzed. The effect of the relation between the life time of the excited state and the time of stabilization of orientation equilibrium on the amplification factor is considered on the basis of the coupled system of Boltzmann equations for the ground and excited states, which are characterized by different energies of interaction with the orienting field.

Amplification of Light by Molecules with Selectively Oriented States in the Pulsed Electric Field

“…Curve (1) corresponds to the situation in which the external electric field E 0 = 1M V /sm and curve (2) corresponds to the situation in which the external electric field pulse E 0 = 2M V /sm. The orientation parameters of the assumed field E 0 are the same value as the dipole moments µ 1 and µ 2 , that are used in papers [4,5,9]. Note that, in the first case, p 2 /p 1 = 4 and external field is a static the parameter α is negative (absorption) and its maximum value is α max = −0.019.…”

“…These ideas were subsequently developed by the authors in [4,5] in which on the basis of the coupled system of kinetic Boltzmann equations for the ground and excited states the effect of the relation between τ ef f 2 and τ 0 on gain α is numerically analyzed. The authors have shown that to achieve the inversionless amplification the value of alignment electric field ⃗ E 0 must be close to or above the breakdown threshold of existing environments, where the studied molecules can be placed.…”