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Proceedings Paper

Materials development and optical properties of Pr-doped ternary lead halides (TlPb2Br5, KPb2Br5, CsPbCl3) for infrared laser applications (Conference Presentation)
Author(s): Sudhir B. Trivedi; Uwe Hömmerich; Al Amin Kabir; Althea G. Bluiett

Paper Abstract

The development of novel crystals with low-phonon-energies continues to be an active area of research for laser applications in the mid-infrared (MIR) region [1-3]. In this work, the material purification, synthesis, crystal growth, and spectroscopic characterization of Pr3+ doped ternary lead halides including Pr: TlPb2Br5 (Pr: TPB), Pr: KPb2Br5 (Pr: KPB), and Pr: CsPbCl3 will be presented. The synthesis of the studied materials was based on the purification of commercial starting materials including directional freezing, multi-pass translation in a zone-melting system and halogenation. The growth of the purified materials was then carried out through vertical Bridgman technique using a two-zone furnace. The trivalent praseodymium ion (Pr3+) offers several intra-4f transitions of interest for laser applications. Using the output of a ~1.5 m fiber laser as excitation source, IR emissions centered at ~1.6 m (3F4/3F33H4) ~2.4 m (3F2/3H63H4), and ~4.6 μm (3H53H4) were observed from all samples at room-temperature. The decay-times of the two bromide crystals Pr: TPB and Pr: KPB were in the millisecond range, whereas Pr: CsPbCl3 exhibited a significantly shorter lifetime of only ~20 s at room-temperature. The short MIR emission lifetime of Pr: CsPbCl3 indicates strong emission quenching, which is most likely through a combination of multi-phonon-relaxation and impurity related quenching mechanism. Reference [1] S. R. Bowman, J. Ganem, B. J. Feldman, and A. W. Kueny, J. Ganem, "Infrared Laser Characteristics of Praseodymium-Doped Lanthum Trichloride", IEEE J. Quant. Electron. 30, (1994) 2925. [2] N. Ter-Gabrielyan, T. Sanamyan, and M. Dubinskii, “Resonantly pumped Pr3+-doped eye-safe laser at ~1.65µm" Opt. Lett. 34 (2009) 1949. [3] B. M. Walsh, U. Hommerich, A. Yoshikawa, A. "Toncelli, Mid-infrared spectroscopy of Pr-doped materials", Journal of Luminescence 197 (2018) 349.

Paper Details

Date Published: 14 May 2019
Proc. SPIE 10981, Laser Technology for Defense and Security XV, 1098105 (14 May 2019); doi: 10.1117/12.2521674
Show Author Affiliations
Sudhir B. Trivedi, Brimrose Corp. of America (United States)
Uwe Hömmerich, Hampton Univ. (United States)
Al Amin Kabir, Hampton Univ. (United States)
Althea G. Bluiett, Elizabeth City State Univ. (United States)

Published in SPIE Proceedings Vol. 10981:
Laser Technology for Defense and Security XV
Mark Dubinskiy; Timothy C. Newell, Editor(s)

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