Affiliation:
1. Prokhorov General Physics Institute of the Russian Academy of Sciences, 119991 Moscow, Russia
Abstract
Yttrium scandate crystals doped by Nd3+ and Tm3+ ions have been successfully grown in the form of fibers using the laser-heated pedestal growth (LHPG) technique. The selective laser spectroscopy methods have identified and distinguished three distinct types of optically active centers associated with Nd3+ and Tm3+ ions. The substitution of Y3+ and Sc3+ for rare-earth ions in the C2 structural site leads to the formation of two distinct basic long-time centers. In Nd3+:YScO3, another type of center (a short-lifetime one) is formed known as the Nd3+–Nd3+ aggregate pair. This center arises from the substitution of Y3+ or Sc3+ for Nd3+ cation in the adjacent MO6 polyhedra that share an edge. In Tm3+:YScO3, the third optical center is formed as a result of the substitution of Y3+ or Sc3+ for Tm3+ in the MO6 octahedra with the C3i site symmetry. The fluorescence decay lifetimes of Nd3+ and Tm3+ ions in the YScO3 crystal structure have been accurately measured and estimated. A Stark level diagram illustrating the splitting of 4F3/2, 4I11/2, and 4I9/2 multiplets of Nd3+ ions has been constructed to show features of the active optical centers with the C2 site symmetry.
Funder
Russian Science Foundation
Subject
General Materials Science
Reference40 articles.
1. Thermal Conductivity, Diffusivity, and Expansion of Y2O3, Y3Al5O12, and LaF3 in the Range 77°–300° K;Klein;J. Appl. Phys.,1967
2. Measurement of the Optical Constants of Yttrium Oxide;Nigara;Jpn. J. Appl. Phys.,1968
3. Petermann, K. (2013). Handbook of Solid-State Lasers: Materials, Systems and Applications, Elsevier.
4. New Oxide Crystals for Solid State Lasers;Fornasiero;Cryst. Res. Technol.,1999
5. Tm3+-Doped LuYO3 Mixed Sesquioxide Ceramic Laser: Effective 205 Μm Source Operating in Continuous-Wave and Passive Q-Switching Regimes;Zhou;Opt. Lett.,2017