Stimulated Raman Adiabatic Passage via bright state in Lambda medium of unequal oscillator strengths

TL;DR

This paper investigates how unequal oscillator strengths affect population transfer efficiency in Lambda-type atomic media using b-STIRAP, revealing sensitivity to oscillator strength ratios and superluminal propagation of the mixing parameter.

Contribution

It provides a detailed analysis of propagation effects in b-STIRAP with unequal oscillator strengths, including a new criterion for adiabaticity and insights into superluminal behavior.

Findings

Population transfer efficiency depends on the ratio q_p/q_s.

Transfer is more efficient when q_p ≤ q_s.

The mixing parameter propagates superluminally.

Abstract

We consider the population transfer process in a Lambda-type atomic medium of unequal oscillator strengths by stimulated Raman adiabatic passage via bright-state (b-STIRAP) taking into account propagation effects. Using both analytic and numerical methods we show that the population transfer efficiency is sensitive to the ratio q_p/q_s of the transition oscillator strengths. We find that the case q_p>q_s is more detrimental for population transfer process as compared to the case where $q_p \leq q_s$. For this case it is possible to increase medium dimensions while permitting efficient population transfer. A criterion determining the interaction adiabaticity in the course of propagation process is found. We also show that the mixing parameter characterizing the population transfer propagates superluminally.