通过固态烧结制备的透明Tm:LuAlO陶瓷的光谱学及二极管泵浦激光运行

Spectroscopy and diode-pumped laser operation of transparent Tm:LuAlO ceramics produced by solid-state sintering.

作者信息

Yue Fangxin, Loiko Pavel, Chen Mengting, Serres Josep Maria, Wang Yicheng, Li Jiang, Basyrova Liza, Dunina Elena, Kornienko Alexey, Fomicheva Liudmila, Dai Shibo, Chen Zhenqiang, Bae Ji Eun, Park Tae Gwan, Rotermund Fabian, Jambunathan Venkatesan, Lucianetti Antonio, Mocek Tomas, Aguiló Magdalena, Díaz Francesc, Griebner Uwe, Petrov Valentin, Mateos Xavier

出版信息

Opt Express. 2020 Sep 14;28(19):28399-28413. doi: 10.1364/OE.400802.

DOI:10.1364/OE.400802

PMID:32988111

Abstract

A transparent Tm:LuAlO ceramic is fabricated by solid-state reactive sintering at 1830 °C for 30 h using commercial α-AlO and LuO/TmO powders and sintering aids - MgO and TEOS. The ceramic belongs to the cubic system and exhibits a close-packed structure (mean grain size: 21 µm). The in-line transmission at ∼1 µm is 82.6%, close to the theoretical limit. The spectroscopic properties of the ceramic are studied in detail. The maximum stimulated-emission cross-section is 2.37×10 cm at 1749nm and the radiative lifetime of the F state is about 10 ms. The modified Judd-Ofelt theory accounting for configuration interaction is applied to determine the transition probabilities of Tm, yielding the intensity parameters Ω = 2.507, Ω = 1.236, Ω = 1.340 [10 cm] and α = 0.196×10 cm. The effect of excited configurations on lower-lying interconnected states with the same J quantum number is discussed. First laser operation is achieved under diode-pumping at 792 nm. A 4 at.% Tm:LuAlO ceramic laser generated 3.12 W at 2022-2035nm with a slope efficiency of 60.2%. The ceramic is promising for multi-watt lasers at >2 µm.

摘要

采用商用α-AlO和LuO/TmO粉末以及烧结助剂MgO和TEOS，通过在1830℃下进行30小时的固态反应烧结制备了一种透明的Tm:LuAlO陶瓷。该陶瓷属于立方晶系，呈现密堆积结构（平均晶粒尺寸：21 µm）。在~1 µm处的直线传输率为82.6%，接近理论极限。对该陶瓷的光谱特性进行了详细研究。在1749nm处的最大受激发射截面为2.37×10 cm，F态的辐射寿命约为10 ms。应用考虑组态相互作用的修正Judd-Ofelt理论来确定Tm的跃迁概率，得出强度参数Ω = 2.507、Ω = 1.236、Ω = 1.340 [10 cm]和α = 0.196×10 cm。讨论了激发组态对具有相同J量子数的较低能级相互连接态的影响。在792 nm的二极管泵浦下实现了首次激光运转。一个4 at.%的Tm:LuAlO陶瓷激光器在2022 - 2035 nm处产生了3.12 W的功率，斜率效率为60.2%。该陶瓷有望用于大于2 µm的多瓦激光器。