New laser properties and spectroscopy of orthorhombic crystals YAlO3:Er3+. Intensity luminescence characteristics, stimulated emission, and full set of squared reduced-matrix elements |〈α[SL]J| |U(t)||α′[S′ L′]J′〉|2 for Er3+ Ions

Abstract

New laser data on orthorhombic YAlO3:Er3+ crystals are obtained. Stimulated emission in the 4S3/2 →5I15/2 channel and cascase lasing of the sequential intermanifold 4S3/2 → 4I11/2 → 4I13/2 transitions are excited at ≈︁ 110 K with Xe‐flashlamp pumping. Intensity absorption and luminescence characteristics of Er3+ ions in the YAlO3 crystal are experimentally determined and quantitatively analyzed in terms of the known semiempirical method. The intensity spectroscopic parameters Ωt obtained (Ω2 = 0.95, Ω4 = 0.58, and Ω6 = 0.55 (in 10−20 cm2)) nicely describe band‐area intensities in the absorption spectrum of the YAlO3:Er3+ crystal in the spectral region below 30000 cm−1. A full set of reduced‐matrix elements for the Er3+ ions is calculated involving all 41 J‐manifolds of the 4f11 configuration lying in energy up to 97000 cm−1. Using these data, the earlier reported intensity parameter Ωt for the YAlO3:Er3+ crystal are revised and it is shown that involving highly excited levels of Er3+ ions into intensity spectroscopic analysis leads to an overestimation of the parameters Ωt because of the possible presence of some additional absorption sources in the YAlO3 host.

Laser crystals and ceramics: recent advances

“…(4) should lead to contradictions more often than is actually the case. Since the energy intervals between the excited 4f N −1 5d 1 configuration and the high-and lowlying 4f N manifolds differ significantly from one another, [58,59]). e) This SE channel is included in the table conditionally because in [60] no scientific explanation for its identification was given.…”

“…Nd 3+ and Er 3+ ) in crystalline materials could be expanded into the vacuum UV region because the corresponding required reduced matrix elements …||U (t) ||… have been calculated (see, e.g. [18,57,59]). …”

Synthesis and spectral analysis of Sm:BaB4O7 microfibers embedded in borate glass

“…The J-O model basically describes the perturbation of the 4f n states by opposite parity 4f n À 1 5d on the basis of three parameters Ω λ ¼ 2,4,6 [28]. Since the admixing of the 4f n states in Ln ion is the function of local crystal field, symmetry, bonding nature etc, J-O parameters in turn yield information on the local interactions of Ln 3 þ with the surrounding environment.…”

Growth and anisotropic spectral properties of Er:YAlO3 crystal

“…The values of the squared reduced matrix elements for the chosen Er 3+ transitions have been numerically evaluated and tabulated in Ref. [15].…”

“…Based on the nonpolarized absorption spectra, the spectroscopic properties of Er 3+ -doped YAP crystals have been investigated by Weber et al [14], Kaminskii et al [15], and Sardar et al [16]. However, because Er:YAP crystals are biaxial and anisotropic, polarized spectroscopic properties should be used to evaluate their laser performances.…”