Coherent manipulation of four-level double lambda-like atomic system by a train of ultra-short few-cycle-optical pulses

TL;DR

This paper demonstrates near-complete coherence in a four-level atomic system using ultra-short pulse trains, analyzes Doppler effects, and proposes schemes with chirped pulses to control atomic states.

Contribution

It introduces a novel method for achieving high coherence in four-level systems with ultra-short pulses and explores Doppler broadening and atomic state manipulation.

Findings

Near-complete coherence achieved in four-level systems

Doppler broadening effects analyzed and mitigated

Chirped pulses enable control of atomic translational states

Abstract

We have demonstrated that near complete coherence can be achieved in a four level double lambda-like systems using a train of ultra-short optical pulses. The effect of the Doppler broadening has been analyzed and a scheme has been proposed for establishing high and uniform coherence across different velocity groups in the atomic ensemble. We have also presented a novel scheme of excitation using chirped pulses and shown that in addition to generating coherence in the system it is possible to alter the translational states of the atoms.