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Thermal Line Shift and Broadening of Ho(3+) in Y3AI5O12 and Lu3AIO12The interaction between the active ion and the host lattice manifests itself in two distinct ways: the static interaction with the crystal field that causes the splitting of the free ion energy levels and the active interaction through the surrounding phonon system that produces temperature dependent characteristics in the optical spectrum of the ion (e.g. line broadening and line shift). The strength of the splitting depends heavily on the electronic configuration of the atom. The model give by McCumber and Sturge describes the thermal effects on line width and position above 77 K with Raman scattering of Debye model phonons. These processes predict a Lorentzian line shape. However, below 77 K the principal contributions are from crystal inhomogeneities that result in a Gaussian line shape. We have investigated the experimental Stark levels as well as the thermal effects on the line width and the position of trivalent holmium ions in both yttrium aluminum garnet, Y3Al5O12 (YAG) and lutetium aluminum garnet, Lu3Al5O12 (LuAG) crystals. We have compared the Stark levels of the (5)I(6) state, and the thermal line shift and broadening of an isolated transition (Z2 to X13) between the (5)I(8) and (5)I(6) stark levels in these crystals. This transition occurs in the near infrared region at approximately 1117 nm.
Document ID
19960003460
Acquisition Source
Headquarters
Document Type
Conference Paper
Authors
Snoke, Elizabeth R.
(North Carolina Univ. Chapel Hill, NC., United States)
Armagan, Guzin
(College of William and Mary Williamsburg, VA., United States)
Grew, Gary W.
(NASA Langley Research Center Hampton, VA, United States)
Barnes, Norman P.
(NASA Langley Research Center Hampton, VA, United States)
Walsh, Brian M.
(Boston Coll. Chestnut Hill, MA., United States)
Date Acquired
September 6, 2013
Publication Date
October 1, 1995
Publication Information
Publication: Second Annual Research Center for Optical Physics (RCOP) Forum
Subject Category
Solid-State Physics
Accession Number
96N13469
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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