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A 6-17 μm tunable and high-pulse-energy far-infrared laser based on a BaGa4Se7 optical parametric oscillator |
| Kejun Wang(王柯君)1,2,3, Hui Kong(孔辉)1,2,3,†, Xiaoxia Li(李晓霞)1,2,3,‡, Dongbo Lv(吕东博)1,2,3,, and Peng Xie(谢鹏)1,2,3 |
1 State Key Laboratory of Pulsed Power Laser Technology, College of Electronic Engineering, National University of Defense Technology, Hefei 230037, China;
2 Advanced Laser Technology Laboratory of Anhui Province, Hefei 230037, China;
3 Nanhu Laser Laboratory, National University of Defense Technology, Changsha 410073, China |
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Abstract Tunable mid-infrared and far-infrared laser output was demonstrated based on BaGa4Se7 crystals and an optical parametric oscillator (OPO). With a 1.06 μm Nd:YAG laser and a double-pass singly resonant OPO cavity, a laser energy output of 2.2 mJ at 10 μm was obtained. By tuning the angle and temperature, a tunable laser output covering the wavelength range from 6 μm to 17 μm was obtained with a tuning precision better than 3 nm. The corresponding optical-to-optical conversion efficiency was 2.8%, and the slope efficiency was 4.4%. The damage effect of the output laser on detectors was also investigated, and point damage to the detector occurred at an output energy of 16.4 μJ. The laser system has the advantages of miniaturization, a wide tuning range, high energy and high tuning resolution. Its broadband laser characteristics make it highly valuable for applications in atmospheric detection, infrared spectroscopy and electro-optical countermeasures.
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Received: 01 July 2025
Revised: 24 July 2025
Accepted manuscript online: 06 August 2025
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PACS:
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42.70.Mp
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(Nonlinear optical crystals)
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42.65.Yj
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(Optical parametric oscillators and amplifiers)
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42.15.Eq
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(Optical system design)
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| Fund: This work was supported by Independent Innovation Science Foundation of National University of Defense Technology (Grant No. 23-ZZCX-JDZ-44). |
Corresponding Authors:
Hui Kong, Xiaoxia Li
E-mail: konghui17@nudt.edu.cn;Lixiaoxia17@nudt.edu.cn
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Cite this article:
Kejun Wang(王柯君), Hui Kong(孔辉), Xiaoxia Li(李晓霞), Dongbo Lv(吕东博), and Peng Xie(谢鹏) A 6-17 μm tunable and high-pulse-energy far-infrared laser based on a BaGa4Se7 optical parametric oscillator 2026 Chin. Phys. B 35 014210
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