1 research outputs found
High Verdet Constant Glass for Magnetic Field Sensors
Due to the high transparency, high Verdet constant, as
well as
easy processing properties, rare-earth ion-doped glasses have demonstrated
great potential in magneto-optical (MO) applications. However, the
variation in the valence state of rare-earth ions (Tb3+ to Tb4+) resulted in the decreased effective concentration
of the paramagnetic ions and thus degraded MO performance. Here, a
strategy was proposed to inhibit the oxidation of Tb3+ into
Tb4+ as well as improve the thermal stability by tuning
the optical basicity of glass networks. Moreover, the depolymerization
of the glass network was modulated to accommodate more Tb ions. Thus,
a record high effective concentration (14.19 × 1021/cm3) of Tb ions in glass was achieved, generating a high
Verdet constant of 113 rad/(T·m) at 650 nm. Lastly, the first
application of MO glass for magnetic field sensors was demonstrated,
achieving a sensitivity of 0.139 rad/T. We hope our work provides
guidance for the fabrication of MO glass with high performance and
thermal stability and could push MO glass one step further for magnetic
sensing applications