红外与激光工程
2023, 52(4): 20220885
山东大学新一代半导体材料研究院, 山东大学晶体材料国家重点实验室, 济南
报道了脉冲半导体激光器侧面泵浦Nd:YAG同步声光调Q纳秒激光器。采用连续输出50 W的Nd:YAG侧面泵浦模块, 当半导体激光器泵浦脉宽250 μm、重复频率1 kHz、声光Q开关延时270 μm时, 实现了平均输出功率2.27 W、脉冲宽度71 ns的稳定调Q脉冲输出。
侧面泵浦 声光调Q 同步调制 side-pump acoustic-optic Q-switched synchronous modulation
山东大学新一代半导体材料研究院, 山东大学晶体材料国家重点实验室, 济南
脉冲半导体激光(LD)泵浦被动调Q微片激光器是产生小型化、大能量(mJ量级)、亚纳秒激光脉冲的主要技术途径。基于速率方程理论推导了脉冲LD泵浦被动调Q微片激光器首脉冲建立时间及多脉冲间隔时间方程, 数值求解并分析了泵浦功率、泵浦脉宽等参数对亚纳秒激光输出脉冲数目的影响规律, 在此基础上搭建了脉冲LD端面泵浦YAG/Nd:YAG/Cr4+:YAG微片激光器, 实现了单脉冲能量1.2 mJ、脉冲宽度574 ps、峰值功率2.1 MW, 光束质量因子M2=1.21的1 064 nm近衍射极限亚纳秒脉冲激光输出。
微片激光器 YAG/Nd:YAG/Cr4+:YAG晶体 被动调Q 速率方程 microchip laser YAG/Nd:YAG/Cr4+:YAG crystal passive Q-switching rate equation
Author Affiliations
Abstract
1 State Key Laboratory of Crystal Materials, Institute of Novel Semiconductors, Shandong University, Jinan 250100, China
2 Key Laboratory of Laser & Infrared System, Ministry of Education, Shandong University, Qingdao 266237, China
3 Collaborative Innovation Center of Light Manipulations and Applications, Shandong Normal University, Jinan 250358, China
4 State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics of CAS, Xi’an 710119, China
In this paper, a high-power and high-efficiency mid-infrared (MIR) optical parametric oscillator (OPO) based on (ZGP) crystal is demonstrated. An acousto-optically Q-switched laser operating at with a maximum average output power of 35 W and pulse width of 38 ns at a repetition rate of 15 kHz is established and employed as the pump source. A doubly resonant OPO is designed and realized with the total MIR output power of 13.27 W, including the signal and idler output power of 2.65 W at and 10.62 W at . The corresponding total optical-to-optical and slope efficiencies are 37.9% and 67.1%, respectively. The shortest pulse width, beam quality factor, and output power instability are measured to be 36 ns, , , and at 8 h, respectively. Our results pave a way for designing high-power and high-efficiency 4– MIR laser sources.
mid-infrared laser optical parametric oscillator nonlinearity Chinese Optics Letters
2022, 20(1): 011403
红外与激光工程
2021, 50(8): 20210436
Author Affiliations
Abstract
1 State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
2 Key Laboratory of Laser & Infrared System, Ministry of Education, Shandong University, Qingdao 266237, China
Mid-infrared (MIR) laser sources operating in the 2.7–3 µm spectral region have attracted extensive attention for many applications due to the unique features of locating at the atmospheric transparency window, corresponding to the “characteristic fingerprint” spectra of several gas molecules, and strong absorption of water. Over the past two decades, significant developments have been achieved in 2.7–3 µm MIR lasers benefiting from the sustainable innovations in laser technology and the great progress in material science. Here, we mainly summarize and review the recent progress of MIR bulk laser sources based on the rare-earth ions-doped crystals in the 2.7–3 µm spectral region, including -, -, and -doped crystalline lasers. The outlooks and challenges for future development of rare-earth-doped MIR bulk lasers are also discussed.
mid-infrared laser 2.7–3 µm spectral region Er3+, Ho3+, and Dy3+-doped crystal Chinese Optics Letters
2021, 19(9): 091407
Author Affiliations
Abstract
1 State Key Laboratory of Crystal Materials, Institute of Novel Semiconductors, Shandong University, Jinan 250100, China
2 Key Laboratory of Crystal Materials, Ningbo University, Ningbo 315211, China
3 Collaborative Innovation Center of Light Manipulations and Applications, Shandong Normal University, Jinan 250358, China
In this paper, the absorption and fluorescence spectra of , co-doped (Er,Pr:YLF) crystal were measured and analyzed. The co-doping was proved to effectively enhance the mid-infrared transition at the 2.7 μm with 74.1% energy transfer efficiency from to . By using the Judd–Ofelt theory, the stimulated emission cross section was calculated to be at 2685 nm and at 2804.6 nm. Moreover, a diode-end-pumped Er,Pr:YLF laser operating at 2659 nm was realized for the first time, to the best of our knowledge. The maximum output power was determined to be 258 mW with a slope efficiency of 7.4%, and the corresponding beam quality factors and . Our results suggest that Er,Pr:YLF should be a promising material for 2.7 μm laser generation.
mid-infrared lasers laser materials solid-state lasers Chinese Optics Letters
2021, 19(8): 081404
1 山东大学新一代半导体材料研究院晶体材料国家重点实验室, 山东 济南 250100
2 南京大学固体微结构物理国家重点实验室, 江苏 南京 210093
基于光学超晶格的光参量振荡技术是研制2~5 μm波段中红外相干光源的有效技术手段,在遥感探测、精密测量、环境监测、医疗诊断、科学研究和****等领域具有非常重要的应用价值。总结了光学超晶格2~5 μm中红外光参量振荡器的国内外研究进展,重点分析了连续波、纳秒脉冲以及皮秒脉冲等不同运转模式下光参量振荡器的结构特点、优势和发展前景。并对光学超晶格中红外光参量振荡器的发展趋势进行了展望,指出高功率、宽调谐、低功耗、小型化和轻量化是光学超晶格光参量振荡器的重要发展方向,而高质量大尺寸(厚度)的光学超晶格晶体、性能优异的泵浦源和可靠的工程化样机设计是未来光参量振荡器发展的核心技术。
激光光学 光学超晶格晶体 光参量振荡器 中红外激光
1 山东大学晶体材料国家重点实验室, 新一代半导体材料研究院, 山东 济南 250100
2 山东大学激光与红外系统集成技术教育部重点实验室, 山东 青岛 266237
基于光学超晶格的光参量振荡技术是产生2~5 μm中红外光源的有效途径,在大气环境监测、医疗诊断、精密光谱分析、光电对抗等领域具有重要的应用价值。针对小型化中红外激光器应用需求,开展了结构紧凑、高效率、宽调谐的纳秒光纤激光泵浦的周期极化掺镁铌酸锂光学超晶格(MgO∶PPLN)光参量振荡器(OPO)的研究。采用1.06 μm纳秒光纤激光泵浦多周期(29~31.6 μm)MgO∶PPLN晶体,结合周期和温度调谐,实现了闲频光2.37~4.01 μm连续调谐中红外激光输出。当泵浦功率为9.95 W时,2.37~3.75 μm平均输出功率均大于1.7 W,其中3.4 μm平均输出功率最大,相应的功率和光光转化效率分别为3.68 W和37%。重点讨论了在2.4、2.7、3.8和4.0 μm处的中红外激光输出特性,最大平均输出功率可分别达到2.87、2.45、1.87和1.22 W,相应的光光转化效率分别为17.2%、19.8%、11.2%和8.6%。本文的研究结果为小型化宽调谐中红外激光器的研发提供了重要的实验依据。
激光器 中红外激光 光参量振荡器 MgO∶PPLN 晶体; 宽调谐