Abstract

High-quality, oriented crystals of BaY_1.5Yb_0.49Er_0.01F₈ have been grown under hydrogen fluoride from BaYYbF₈ seed crystals by a gradient-freeze, stationary-solidification modification of the vertical Bridgman method. Emission spectra obtained parallel and perpendicular to [010] show marked anisotropy. The room-temperature upconversion laser threshold for the ⁴F_9/2–⁴I_15/2 transition at 670 nm (with 960-nm pumping from a titanium:sapphire laser) with the output propagating perpendicular to [010] is approximately two thirds that when propagating parallel to [010], consistent with the differences observed in fluorescence emission spectra obtained for the two polarizations.

© 1994 Optical Society of America

Orientation-dependent fluorescence studies and spectroscopic analysis of doped barium yttrium fluoride upconversion laser crystals (BaY_2−x−yYb_xTm_yF₈)

Jonathan J. Owen, Anthony K. Cheetham, and Ross A. McFarlane
J. Opt. Soc. Am. B 15(2) 684-693 (1998)

Upconversion laser emission from Yb³⁺-sensitized Tm³⁺ in BaY₂F₈

R. J. Thrash and L. F. Johnson
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Upconversion laser in BaY₂F₈:Er 5% pumped by ground-state and excited-state absorption

R. A. McFarlane
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Excitation scheme for the upper energy levels in a Tm:Yb:BaY₂F₈ laser crystal

M. A. Noginov, M. Curley, P. Venkateswarlu, A. Williams, and H. P. Jenssen
J. Opt. Soc. Am. B 14(8) 2126-2136 (1997)

Selective sensitization of 480-nm blue upconversion by Tm³⁺–Er³⁺ energy transfer in tellurite glass

S. Tanabe, K. Suzuki, N. Soga, and T. Hanada
J. Opt. Soc. Am. B 11(5) 933-942 (1994)