The basic spectroscopic parameters of Ho3+-doped fluoroindate glass for emission at 3.9 μm
The basic spectroscopic parameters of Ho3+-doped fluoroindate glass for emission at 3.9 μm
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DOI：
10.1016/j.optmat.2016.08.019
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发表时间：
2016-10-01
影响因子：
3.9
通讯作者：
Jackson, Stuart D.
中科院分区：
文献类型：
--
作者：
Gomes, Laercio;Fortin, Vincent;Jackson, Stuart D.
本报告详细介绍了第一次研究的基本光谱特性的一种新的光学材料的应用前景作为增益介质的光纤激光器发射在3.9 μ m。利用时间分辨荧光光谱研究了单掺Ho ~（3+）的InF_3（fluoroindate）玻璃中I-5（5）→ I-5（6）跃迁激发态的衰减过程。玻璃中的HoF 3浓度为10摩尔%。我们分别在1982 nm和1150 nm处使用选择性激发来激发I-5（7）和I-5（6）能级。我们已经建立了一个强大的能量转移上转换过程的方式，众所周知的偶极-偶极-两个钬离子之间的相互作用激发到I-5（6）的水平填充的I-5（5）（上激光）的3.9 μ m跃迁的水平。I-5（6）和I-5（5）能级发射的发光的测量峰值分别位于2.85 μ m和3.92 μ m，这些发射的发光效率分别为78%和0.2%。数值模拟的结果表明，在889 nm波长的激光直接上能级泵浦后，在很短的时间内（t < 100 μ s），Ho ~（3+）离子浓度达到3.9 gm跃迁的粒子数反转。(C)© 2016 Elsevier B. V.版权所有。
This report details the first study of the fundamental spectroscopic properties of a new optical material for prospective application as a gain medium for fiber laser emission at 3.9 mu m. We have investigated the decay processes that are relevant to the excited states of the I-5(5) -> I-5(6) transition in singly Ho3+-doped InF3 (fluoroindate) glass using time-resolved fluorescence spectroscopy. The HoF3 concentration in the glass was 10 mol.%. We excited the I-5(7) and I-5(6) energy levels using selective excitation at 1982 nm and 1150 nm, respectively. We have established that a strong energy-transfer upconversion process by way of the well-known dipole-dipole-interaction between two holmium ions excited to the I-5(6) level populate the I-5(5) (upper laser) level of the 3.9 mu m transition. The I-5(6) and I-5(5) energy levels emit luminescence with measured peaks located at 2.85 mu m and 3.92 mu m, respectively and the luminescence-efficiencies of these emissions are 78% and 0.2%, respectively. Results from numerical simulations show that for this high Ho3+ concentration, a population inversion for the 3.9 gm transition is reached only for a short time (t < 100 mu s) after direct upper laser level pumping at a wavelength of 889 nm. (C) 2016 Elsevier B.V. All rights reserved.