Quantum Electronics

Inhomogeneous broadening and splitting of lines in spectra of YAG : Tm

Marina N. Popova, E. P. Chukalina, С. А. Климин, M.-Ch. Chou

Published Mar 1, 2020• 4 citations

Abstract

Abstract The shape and fine structure of lines due to Tm3+ f −f electronic transitions in multifunctional Y3Al5O12 garnet crystals have been studied by high-resolution spectroscopy. The observed inhomogeneously broadened lines have a Lorentzian shape, suggesting that point defects make a predominant contribution to the inhomogeneous broadening. Moreover, YAl antisite defects, which are formed during high-temperature melt growth, produce spectral satellites near the main lines.

DOI: 10.1070/qel17271

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Quantum Electronics

Inhomogeneous broadening and splitting of lines in spectra of YAG : Tm

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Published Mar 1, 2020• 4 citations

Publisher

Abstract

DOI: 10.1070/qel17271

Related papers

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0.6\phantom{\rule{4.pt}{0ex}}\text{GHz}

, which temperature dependence and pump-probe spectroscopy indicate is likely a homogeneous effect, suggesting inhomogeneity is well below the GHz scale.

Spectroscopy and Coherence of an Excited-State Transition in Tm

^{3+}

:YAlO

_3

at Telecommunication Wavelength

We characterize spectroscopic and coherence properties of the 1451.37 nm excited-state zero-phonon line (ZPL) between the

^{3}F_{4}

and the

^{3}H_{4}

manifolds of a thulium-doped yttrium aluminum perovskite (Tm

^{3+}

:YAlO

_3

) crystal at temperatures around 1.5 K. We measure the absorption spectrum between the

^{3}H_{6}

^{3}F_{4}

and

^{3}F_{4}

^{3}H_{4}

manifolds, the inhomogeneous broadening of the

^{3}F_{4}

^{3}H_{4}

(excited-state) ZPL, and the lifetimes of the higher-lying and lower-lying excited states. We also investigate level shifts caused by the quadratic Zeeman interaction as well as spectral hole-burning spectra with varying magnetic fields, providing insights into hyperfine interactions. Using again spectral holes but also optical free induction decays (FIDs), we assess optical coherence times, finding a maximum of

4.75 \pm 0.07~μs

at B=2T and low ion concentration in the

^{3}F_{4}

level. Our results -- the first to demonstrate coherence of an excited-state transition in a rare-earth crystal -- suggest the possibility of exploiting such transitions for quantum technology.