Open AccessThe quantum coherent left handness of Λ-type four level system in Er3+：YAlO3 crystal
Author(s) -
Chunxu Liu,
Jisen Zhang,
Junye Liu,
Jin Guang
Publication year - 2009
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.58.5778
Subject(s) - electromagnetically induced transparency , refractive index , crystal (programming language) , ion , absorption (acoustics) , physics , atomic physics , negative refraction , materials science , optics , quantum mechanics , computer science , programming language
We first calculated the negative refractive index on the solid Er3+YAlO3 crystal with a Λ-type four-level scheme proposed for atomic vapour by Thommen and Mandel and Kastel using quantum interference and electromagnetically induced transparency EIT. It is shown that the frequency band with the negative index is wider 1 MHz than that reported previously. UsuallyImn is always positivecorresponding to absorptionand the ratio of refraction to absorption|Ren/Imn|is only of the order of unity. In our case the ratio |Ren/Imn|=4.6which indicates that the absorption has been well suppressed by EIT approach. The negative Imn may be related to the stimulated emission of 4I13/2→4I15/2 of rare earth ion Er3+. It indicates that the rare earth ion doped material with abundant energy levels and various electric and magnetic transitions is an outstanding and practical candidate for electromagnetically induced negative refractive index material.