Anomalous Power-Dependent Absorption in Er3+-Doped Y2O3 Single Crystals

Gang Wang, Xue Yan, Jin‐Hui Wu +1 more

Tsuyoshi Okuno, Kōichiro Tanaka, Tohru Suemoto

Markus Pollnau, ERNST HEUMANN, Günter Huber

Haitao Zhang, Jun Mo Yang, Jason A. Brown +4 more

La3+ is used as an index modifier to tune the refractive index of Er3+ doped Y2O3 transparent ceramics without reducing the coherence lifetime of Er3+ 4I13/2−4I15/2 transition. La3+ and Er3+ are incorporated into Y2O3 through a solution-phase nanoparticle synthesis and nanoparticles are sintered into transparent ceramics by hot isostatic press. The maximum La3+ doping concentration is about 10%, which increases the refractive index of Y2O3 by 0.009 (Δn/n = 0.48%). La3+ doping doesn’t reduce Er3+ optical coherence lifetime. The homogeneous linewidth of Er3+(20 ppm) 4I13/2−4I15/2 transition in La3+ doped Y2O3 ceramics is about 10 kHz at 2 K and 0.65 T, which is close to the reported homogeneous linewidth in Er3+ doped Y2O3 ceramics and single crystals. Such La3+ Er3+ co-doped Y2O3 ceramics are proper materials to fabricate optical waveguides for quantum memory applications.

Isaac Richman, N. C. Chang

The ordinary fluorescence of Er3+ in Y2O3 and LaF3 crystals is observed when the crystals are excited with 6328-Å, He-Ne laser radiation. From the linear power dependence of the 6800-Å fluorescence and the quadratic power dependence of the 5640- and 3900-Å fluorescence on the 6328-Å excitation, a single-photon excitation for the 6800-Å fluorescence and a double-photon stepwise excitation for the 5640- and 3900-Å fluorescence were proposed. The calculated photon flux of the 5640-Å fluorescence based on the two-photon stepwise excitation agrees with the estimated observed value.

V I Zhekov, T. M. Murina, А. В. Попов +1 more