Affiliation:
1. Shandong Normal University
2. National University of Defense Technology
Abstract
Cascade transitions of Ho3+:5I6→5I7 and 5I7→5I8 provide a platform for a dual-wavelength mid-infrared (MIR) laser. In this paper, a continuous wave cascade MIR Ho:YLF laser operating at 2.1 and 2.9 µm is realized at room temperature. The total output power of 929 mW with 778 mW at 2.9 µm and 151 mW at 2.1 µm is obtained under the absorbed pump power of 5 W. Compared to the non-cascade mode, 2.9-µm lasing threshold is reduced by 10.3% and the slope efficiency is increased by 76.1% with the supports of cascade lasing at 2.1 µm. However, 2.9-µm lasing is the key population accumulation of the 5I7 level, which thus efficiently reduces the threshold and improves the output power of the 2.1-µm laser. Our results put forward a way for generating cascade dual-wavelength MIR lasing in Ho3+-doped crystals.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Shandong Province
China Postdoctoral Science Foundation
Postdoctoral Innovation Project of Shandong Province
Open Research Fund of State Key Laboratory of Pulsed Power Laser Technology
Youth Cross Innovation Group of Shandong University
Financial Support from Qilu Young Scholar of Shandong University
Subject
Atomic and Molecular Physics, and Optics
Cited by
6 articles.
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