Effective unidirectional pumping for steady-state amplification without inversion

TL;DR

This paper explores a method for steady-state amplification without population inversion in a three-level cascade system using effective unidirectional pumping through bidirectional incoherent pumps, providing analytical solutions and parameter conditions.

Contribution

It introduces a novel approach for achieving amplification without inversion by employing effective unidirectional pumping in a three-level cascade scheme, supported by analytical steady-state solutions.

Findings

Demonstrates the feasibility of inversionless amplification with proper parameter choices.

Provides analytical steady-state solutions for population and coherence.

Identifies conditions under which amplification without inversion can occur.

Abstract

We discuss an opportunity to achieve amplification without inversion in three-level cascade scheme using an effective unidirectional pumping via bidirectional incoherent pump. Analytical solution to the population and the coherence are obtained in the steady-state regime. With a proper choice of the parameters, obtained here, the possibility for amplification without inversion is presented.