Magnetic circular polarization of luminescence in Bismuth-doped silica glass

TL;DR

This study investigates the magnetic circular polarization of near-infrared luminescence in bismuth-doped silica glass, revealing that the emission originates from a non-Kramers doublet and is most polarized at 1440 nm.

Contribution

It provides new insights into the magnetic polarization behavior of Bi-doped silica glass and identifies the electronic origin of the luminescence as a non-Kramers doublet.

Findings

Maximum circular polarization at 1440 nm emission

Luminescence originates from a non-Kramers doublet

Temperature and magnetic field dependence analyzed

Abstract

The magnetic field induced circular polarization of near infrared photoluminescence in Bi-doped pure silica glass was studied in the spectral range of 660 - 1600 nm covering three excited state levels. The highest degree of magnetic circular polarization of luminescence was observed in the lasing, first excited state (peak emission at 1440 nm). The results of variable temperature and variable magnetic field measurements allows to conclude that the near infrared luminescence originates from an isolated non-Kramers doublet of the even-electron system.