Controlled Stark shifts in Er3+-doped crystalline and amorphous waveguides for quantum state storage

We present measurements of the linear Stark effect on the 4I15/2 → 4I13/2 transition in an Er3+-doped proton-exchanged LiNbO3 crystalline waveguide and an Er3+-doped silicate fiber. The measurements were made using spectral hole burning techniques at temperatures below 4 K. We measured an effective Stark coefficient (Δμeχ)/(h) = 25 ± 1 kHz/V cm−1 in the crystalline waveguide and (Δμe¯χ)/(h)=15±1 kHz/V cm−1 in the silicate fiber. These results confirm the potential of erbium-doped waveguides for quantum state storage based on controlled reversible inhomogeneous broadening.