Optical decoherence, spectroscopy, and magnetic g tensors for the 1.5-µm I15/24−I13/24 transitions of Er3+ dopants at the C2-symmetry site in Y2O3,Physical Review B

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Optical decoherence, spectroscopy, and magnetic g tensors for the 1.5-µm I15/24−I13/24 transitions of Er3+ dopants at the C2-symmetry site in Y2O3
Physical Review B ( IF 3.2 ) Pub Date : 2024-07-17 , DOI: 10.1103/physrevb.110.045132
Thomas Böttger ₁ , T. L. Harris ₁ , G. D. Reinemer ₁ , C. W. Thiel ₁ , R. L. Cone ₁

Affiliation

Erbium-doped solids are a promising platform for quantum technology due to the

E r^{3 +}

1.5-µm optical transition in the telecom C band that can offer long coherence times. To characterize the intrinsic

C_{2}

site of

E r^{3 +}

Y_{2} O_{3}

for quantum information and photonic signal-processing applications, absorption and site-selective fluorescence spectroscopy were used to assign the

E r^{3 +} {}^{4}I_{15 / 2}

\leftrightarrow

{}^{4}I_{13 / 2}

transitions. The lowest-to-lowest transition occurs at 1535.608 nm and laser absorption determined an inhomogeneous linewidth of 780 MHz in a 0.005%-doped crystal at 3.4 K. Time-resolved fluorescence established an upper limit for the excited-state lifetime of 8.5 ms. Angular-dependent Zeeman absorption was used to determine ground- and excited-state

g

tensors. The

C_{2}

-site

g

tensor components for the ground state are

g_{x} = 1.60

g_{y} = 4.71

, and

g_{z} = 11.93

with a tipping angle of α =

2 . 06^{\circ}

, whereas for the excited state the components are

g_{x} = 1.08

g_{y} = 4.36

, and

g_{z} = 10.07

with a tipping angle of α =

- 11 . 7^{\circ}

. Optical decoherence can be suppressed by the application of a magnetic field parallel to

〈 111 〉

crystal axes where all

C_{2}

sites become nearly magnetically equivalent with large

g

values so that spin flips of neighboring

E r^{3 +}

ions can be simultaneously suppressed. Using this magnetic field direction, two-pulse photon echoes gave a homogeneous linewidth of 5 kHz for an applied magnetic field of 0.5 T, narrowing and saturating at 2.5 kHz at 3.5 T. Decoherence over intermediate magnetic fields was described by spectral diffusion due to

E r^{3 +} − E r^{3 +}

magnetic dipole interactions driven by the direct phonon process. With

E r^{3 +}

Y_{2} O_{3}

absorption at a convenient telecom laser wavelength and the ability to fabricate waveguides, our study suggests that this is a promising material system for quantum information and spectral hole-burning signal-processing applications.

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