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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 15, Iss. 2 — Feb. 1, 1998
  • pp: 684–693

Orientation-dependent fluorescence studies and spectroscopic analysis of doped barium yttrium fluoride upconversion laser crystals (BaY2−xyYbxTmyF8)

Jonathan J. Owen, Anthony K. Cheetham, and Ross A. McFarlane  »View Author Affiliations


JOSA B, Vol. 15, Issue 2, pp. 684-693 (1998)
http://dx.doi.org/10.1364/JOSAB.15.000684


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Abstract

Crystals of BaY1.75Yb0.24Tm0.01F8,BaY1.50Yb0.49Tm0.01F8, and BaY1.00Yb0.99Tm0.01F8 grown by the gradient-freeze method under a hydrogen fluoride atmosphere operate as lasers at 348, 456, 482, 512, and 649 nm when upconversion pumped at 960 nm. The 649-nm red lasers show a clear orientation dependence; lasing is observed only when propagation is perpendicular to the crystallographic [010] direction. The orientation dependence of the red fluorescence confirms that the laser transition is exclusively polarized parallel to [010]. Ellipsoidal representations of intensities are determined from fluorescence data for several red and blue transitions. A crystal with composition BaY1.75Yb0.20Tm0.05F8 is considered as representative of the upconversion laser media. Stark levels for the 3H6,3F4,3H5,3H4,3F3,3F2,1G4,1D2, and 1I6 states are determined from absorption and fluorescence over a range of temperatures from 10 to 298 K. A Judd–Ofelt analysis that averages data for three orthogonal polarizations is also performed.

© 1998 Optical Society of America

OCIS Codes
(140.5680) Lasers and laser optics : Rare earth and transition metal solid-state lasers
(140.7300) Lasers and laser optics : Visible lasers
(160.5690) Materials : Rare-earth-doped materials
(300.1030) Spectroscopy : Absorption
(300.6280) Spectroscopy : Spectroscopy, fluorescence and luminescence

Citation
Jonathan J. Owen, Anthony K. Cheetham, and Ross A. McFarlane, "Orientation-dependent fluorescence studies and spectroscopic analysis of doped barium yttrium fluoride upconversion laser crystals (BaY2–x–yYbxTmyF8)," J. Opt. Soc. Am. B 15, 684-693 (1998)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-15-2-684

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