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Appl. Sci. 2015, 5(4), 1484-1493; doi:10.3390/app5041484

Trichromatic π-Pulse for Ultrafast Total Inversion of a Four-Level Ladder System

1
Departament de Física, Universitat Politècnica de Catalunya, Colom 11, Terrassa (Barcelona) 08222, Spain
2
Escola Politècnica Superior, Universitat de Vic, Carrer de la Laura 13, Vic (Barcelona) 08500, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Totaro Imasaka
Received: 8 October 2015 / Revised: 14 November 2015 / Accepted: 24 November 2015 / Published: 30 November 2015
(This article belongs to the Section Optics and Lasers)
View Full-Text   |   Download PDF [975 KB, uploaded 30 November 2015]   |  

Abstract

We present a numerical solution for complete population inversion in a four-level ladder system obtained by using a full π-pulse illumination scheme with resonant ultrashort phase-locked Gaussian laser pulses. We find that a set of pulse areas such as √3π , √2π , and √3π completely inverts the four-level system considering identical effective dipole coupling coefficients. The solution is consistent provided the involved electric fields are not too strong and it is amply accurate also in the case of diverse transition dipole moments. We study the effect of detuning and chirp of the laser pulses on the complete population inversion using the level structure of atomic sodium interacting with ps and fs pulses as an example. Our result opens the door for multiple applications such as efficient ultrashort pulse lasing in the UV or the engineering of quantum states for quantum computing. View Full-Text
Keywords: ultrashort pulses; coherent control; quantum computing ultrashort pulses; coherent control; quantum computing
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Serrat, C.; Corbera, M.; Afa, J. Trichromatic π-Pulse for Ultrafast Total Inversion of a Four-Level Ladder System. Appl. Sci. 2015, 5, 1484-1493.

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