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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 17 — Jun. 10, 2009
  • pp: 3225–3231

Effect of doping concentration on spectroscopic and structural properties of Nd : Na Y ( W O 4 ) 2 crystal

Mohit Tyagi, S. Govind Singh, and Sangeeta  »View Author Affiliations


Applied Optics, Vol. 48, Issue 17, pp. 3225-3231 (2009)
http://dx.doi.org/10.1364/AO.48.003225


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Abstract

The optical and structural properties of Na Nd x Y 1 x ( W O 4 ) 2 (NYW) single crystals grown from melt containing 1–10 at. % of Nd have been investigated. Optical absorption, photoluminescence, x-ray diffraction, and x-ray florescence studies have been carried out on grown crystals. The crystal is found to exhibit a broad absorption peak of 16 nm width at 806 nm for 6 at. % of Nd doping. A decrease in fluorescence lifetime from 150 to 80 μs with an increase in Nd 3 + concentration is observed for 1.06 μm emission. Spectroscopic quality parameters ( Ω 4 / Ω 6 ) and quantum efficiency calculated from the above measurements and application of Judd–Ofelt theory are found to be 1.1 and 68%, respectively. Structural analysis through Rietveld refinement of x-ray diffraction data showed that the oxygen sublattice of NYW is not affected by changes in Nd dopant concentration, though the lattice dimensions are found to increase proportionately. The study for the first time shows that the high doping levels do not introduce any strain into the lattice. As a consequence the optical quality of the crystal does not deteriorate at high doping levels. The selection of doping concentration is therefore solely governed by the decay time requirement for a particular application.

© 2009 Optical Society of America

OCIS Codes
(140.3580) Lasers and laser optics : Lasers, solid-state
(160.5690) Materials : Rare-earth-doped materials
(300.6280) Spectroscopy : Spectroscopy, fluorescence and luminescence

ToC Category:
Spectroscopy

History
Original Manuscript: March 4, 2009
Revised Manuscript: May 15, 2009
Manuscript Accepted: May 18, 2009
Published: June 5, 2009

Citation
Mohit Tyagi, S. Govind Singh, and Sangeeta, "Effect of doping concentration on spectroscopic and structural properties of Nd:NaY(WO4)2 crystal," Appl. Opt. 48, 3225-3231 (2009)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-48-17-3225


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