Investigation of Coherent Optical Processes Using Short Duration Pulses in Gaseous Media.

V.V. Gritsyna, T. S. Kijan, A. G. Koval

Ashiqur Rahman, Joseph H. Eberly

I A Poluéktov, A. Nazarkin

A theoretical investigation is made of collinear propagation of high-power optical pulses through a medium under conditions of two-photon resonance ω 0 ± ω s ≈ ω 21 ( ω 0 and ω s are the pulse frequencies, ω 21 is the frequency of an atomic transition in the medium). It is assumed that the condition for coherent interaction τ 0 , τ s < T 2 is satisfied ( τ 0 and τ s are the pulse durations at the entrance, T 2 is the phase relaxation time of the medium). By means of numerical integration of equations for the fields and the medium, it is shown that efficient generation of the harmonics ω 1 = 2 ω 0 ± ω s , ω 2 = 2 ω s ± ω 0 is possible under short and ultrashort pulse conditions.

S. M. Hamadani

Nikolai G. Kalugin, Yuri V. Rostovtsev, Marlan O. Scully

We show that coherently driven atomic or molecular media potentially yield strong controllable short pulses of THz radiation. The method is based on excitation of maximal quantum coherence in a gas medium by optical pulses and coherent scattering of infra-red radiation to produce pulses of THz radiation. The pulses have the energies range from several nJ to $μ$J and time durations from several fs to ns at room temperature.

C. K. Rhodes