Growth and spectroscopic analysis of Yb3+-doped Y3Al5O12 fiber single crystals

Abstract

Two major fiber crystal growth methods have been applied for the synthesis and spectroscopic characterizations of Yb3+-doped Y3Al5O12 (Yb:YAG) to show the feasibility of a flexible single crystal fiber laser. One is the micropulling-down (μ-PD) method and the other is the laser heated pedestal growth (LHPG) method. 500 mm length fiber with no Yb segregation has been grown by the μ-PD method. A detailed analysis of Yb:YAG spectroscopy is made to contribute to the discussion on the determination of energy levels. On the other hand, a combinatorial chemistry approach has been applied on concentration gradient crystal fibers grown by the LHPG method allowing the measurement of the intrinsic radiative lifetime and the analysis of concentration quenching processes of Yb3+ ions in YAG.

Spectroscopic properties of Yb3+: LuLiF4 crystal grown by the Czochralski method for laser applications and evaluation of quenching processes: a comparison with Yb3+: YLiF4

“…Besides, the experimental decay time value is increasing with the increase of the temperature contrary to the oxide hosts which reveals again a strong self-trapping. Similar increase of the decay time with the concentration was observed up to 17%Yb 3+ in CaF 2 grown either by LHPG method or by simple melting method [22], which is a higher value with respect to sesquioxides and YAG about 5%Yb 3+ for instance [23][24][25][26][27]. Fig.…”

“…7. In LLF, where the distance between two Lu ions is in the order of 3.7 Å as for YLF, it was rather difficult to observe the cooperative emission comparing with other materials as Y 2 O 3 [25], YAG [27], GGG [36] and CaF 2 [22] studied in the group in which the pair distances are comparable. The observation of the energy transfer by up-conversion effect compared to the pair luminescence or the cooperative luminescence is indeed, much more probable of several orders of magnitude and so the cooperative emission is covered by the up conversion one.…”

Why so deep research on Yb3+-doped optical inorganic materials?

“…Schematic Yb 3+ energy levels for 4f 13 and 4f 12 -5d configurations and location of the charge transfer band (O 2 −2 ) → 4f are shown in Fig. 1.…”

“…1. The ground electronic configuration of Yb 3+ is 4f 13 , which corresponds to a single hole in the complete 4f electronic shell. This electronic configuration has a unique spectral term, 2 F that is split by the spin-orbit interaction in two energy manifolds, 2 F 7/2 (ground manifold) and 2 F 5/2 ; in crystal fields of symmetry lower than cubic the ground manifold is split in four Stark levels and the excited manifold in three levels as shown schematically in Fig.…”

Synthesis and Study of the Infrared Luminescence of Solid Solutions (Y1-Xybx)3al5o12 With Laser Excitation

“…В пользу этого предположения свидетельствуют данные работ [14][15][16][17][18], посвященных изучению меха-низма концентрационного тушения люминесценции ионов иттербия в других матрицах.…”