Abstract

A ${{\rm YVO}_4}$ single crystal doped with $^{142}{{\rm Nd}^{3 +}}$ ions is grown using the Czochralski method. We present systematic spectroscopy measurements of the $^4{{\rm I}_{9/2}} \to {^4}{{\rm F}_{3/2}}$ transition of $^{142}{{\rm Nd}^{3 +}}$ ions at a temperature of 1.5 K. An absorption coefficient of $3.0\;{{\rm mm}^{- 1}}$ is obtained, along with an inhomogeneous broadening below 0.5 GHz. Under a magnetic field of 0.3 T, the optical coherence time and population lifetime are measured as 64 µs and 120 µs, respectively. The ground-state spin relaxation time approaching 11.3 s is determined by spectral hole burning. These results demonstrate the potential for broadband quantum storage using the electron spin levels of this material.

© 2020 Optical Society of America

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