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Applied Physics Letters / Volume 86 / Issue 15 / STRUCTURAL, MECHANICAL, THERMODYNAMIC, AND OPTICAL PROPERTIES OF CONDENSED MATTER

Appl. Phys. Lett. 86, 151911 (2005); http://dx.doi.org/10.1063/1.1901815 (3 pages)

Tb3+-doped KPb2Br5: Low-energy phonon mid-infrared laser crystal

U. N. Roy1, R. H. Hawrami1, Y. Cui1, S. Morgan1, A. Burger1, Krishna C. Mandal2, Caleb C. Noblitt2, S. A. Speakman3, K. Rademaker4, and S. A. Payne4

1Center of Excellence in Physics and Chemistry of Materials, Fisk University, Nashville, Tennessee 37208-3051
2EIC Laboratories, Incorporated, 111 Downey Street, Norwood, Massachusetts 02062
3Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6064
4Lawrence Livermore National Laboratory, University of California, L-580, Livermore, California 94550

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(Received 15 September 2004; accepted 8 March 2005; published online 6 April 2005)

Crystals of potassium lead bromide (KPB), a moisture-insensitive low-energy phonon laser host, were synthesized and purified. High-quality undoped and Tb3+-doped (nominal doping concentration was 5 mol % TbBr3) KPb2Br5 were grown by the vertical Bridgman technique. X-ray diffraction measurements indicated that, at room temperature, the material was monoclinic with space group P21/c, while at a high temperature the phase transformed to orthorhombic form. A reversible phase transition was observed around 256 °C upon the heating and cooling cycle from differential scanning calorimetric measurements. The material was found to be transparent in the broad range from ∼ 0.4 μm to 25 μm and above. The transmission spectrum of a Tb3+-doped crystal showed different absorption bands of Tb3+ at 4.5 μm, 3 μm, 2.3 μm, and 2 μm corresponding to math–math transitions, for α = 2–5. The maximum phonon energy of undoped KPb2Br5 at room temperature was determined to be 134 cm−1 from Raman scattering spectrum.

© 2005 American Institute of Physics

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KEYWORDS and PACS

Keywords

potassium compounds, lead compounds, terbium, solid lasers, crystal growth from melt, phonon spectra, Raman spectra, space groups, X-ray diffraction, differential scanning calorimetry, solid-state phase transformations, crystal structure

PACS

  • 42.55.Rz

    Doped-insulator lasers and other solid state lasers

  • 42.70.Hj

    Laser materials

  • 81.10.Fq

    Growth from melts; zone melting and refining

  • 64.70.K-

    Solid-solid transitions

  • 81.30.Hd

    Constant-composition solid-solid phase transformations: polymorphic, massive, and order-disorder

  • 78.30.Hv

    Other nonmetallic inorganics

  • 63.20.-e

    Phonons in crystal lattices

  • 61.66.Fn

    Inorganic compounds

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.1901815

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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    References

    R. Balda, F. Fernandez, A. Mendioroz, M. Voda, and M. Al-Saleh, Phys. Rev. B 68, 165101 (2003).


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