Harmonic generation in the multiphoton excitation of a two-level system by a powerful noise field

Gennady M. Krochik, N. M. Krochik

N. A. Iskanderov

R. Parzyński, T. Kopyciuk

In the limits of weak and strong excitation, we solve analytically the Riccati-type differential equation for a two-level system in the field of two different lasers and then use these solutions to find easy to handle formulae for the induced electric-dipole moment of the system.We apply these formulae to describe the effects of strong excitation in both the higher harmonics generation and multiphoton frequency mixing, namely the diminishing of the generation of harmonics of a given laser when an additional laser is turned on and the diminishing of the radiation at mixed frequencies with increasing strength of lasers under the condition of multiphoton excitation.

H. K. Avetissian, B. R. Avchyan, G. F. Mkrtchian

The theory of coherent radiation emission in two-level quantum systems with permanent dipole moments at the multiphoton resonant excitation by moderately strong laser fields is presented. A simple analytic formula for the expectation value of a dipole moment operator is obtained. The spectrum corresponding to harmonic generation and low-frequency radiation on the generalized Rabi frequency is investigated both analytically and numerically. The effect of dynamic Stark shift on a dipole spectrum under direct multiphoton resonant excitation is considered.

Arindum Mukherjee, Nandini Mukherjee, J.-C. Diels +1 more

H. K. Avetissian, B. R. Avchyan, G. F. Mkrtchian

Coherent light scattering by a three-level atom due to multiphoton resonant excitation by laser radiation is studied towards the coherent shortwave radiation generation. The spectrum corresponding to harmonics generation is investigated both analytically and numerically.