Author Affiliations
Abstract
1 Key Laboratory of Laser & Infrared System, Ministry of Education, Shandong University, Qingdao 266237, China
2 School of Information Science and Engineering, Shandong Provincial Key Laboratory of Laser Technology and Application, Shandong University, Qingdao 266237, China
3 Institute of Novel Semiconductors, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
4 Leibniz-Institut für Kristallzüchtung (IKZ), Berlin 12489, Germany
We present our efforts towards power scaling of Er:Lu2O3 lasers at 2.85 µm. By applying a dual-end diode-pumped resonator scheme, we achieve an output power of 14.1 W at an absorbed pump power of 59.7 W with a slope efficiency of 26%. In a single-end pumped resonator scheme, an output power of 10.1 W is reached under 41.9 W of absorbed pump power. To the best of our knowledge, this is the first single crystalline mid-infrared rare-earth-based solid-state laser with an output power exceeding 10 W at room temperature.
high-power continuous-wave laser mid-infrared laser dual-end pump scheme Chinese Optics Letters
2024, 22(1): 011403
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
山东大学 晶体材料国家重点实验室, 山东 济南 250100
单晶光纤是具有准一维结构的功能晶体材料, 结合了体块单晶优异的物化性能和传统光纤材料比表面积大的结构优势, 是一种极具潜力的激光增益介质。目前单晶光纤激光的研究主要集中于连续激光输出, 关于脉冲激光性能的研究相对较少。我们采用微下拉法(μ-PD)制备的Yb∶LuAG单晶光纤(SCF)作为增益介质, 获得了输出功率大于4 W、斜效率21.66%、光束质量因子M2接近于1的连续激光输出。在此基础上, 采用MoTe2作为可饱和吸收体, 实现了Yb∶LuAG SCF最高单脉冲能量3.39 μJ的被动调Q脉冲激光输出。该工作为Yb∶LuAG SCF在全固态高功率连续和脉冲激光器中的应用提供了参考。
单晶光纤 脉冲激光 被动调Q single crystal fiber Yb∶LuAG Yb∶LuAG pulsed laser MoTe2 MoTe2 passive Q-switched
1 北京市激光应用技术工程技术研究中心,北京 100124
2 北京工业大学跨尺度激光成型制造技术教育部重点实验室,北京 100124
3 北京工业大学激光工程研究院,北京 100124
4 山东大学晶体材料国家重点实验室,山东 济南 250100
5 暨南大学光子技术研究院,广东 暨南510632
为了研究空芯反谐振光纤的中红外激光传输能力,使用自制的无节点空芯反谐振光纤进行了2.60~4.35 μm的中红外激光传输实验。该空芯反谐振光纤包层由七根平均壁厚为800 nm的玻璃毛细管组成,光纤外径为365 μm,纤芯直径为115 μm。使用中红外可调谐光参量振荡器作为光源,测试了光纤在2.60,3.27,3.41,3.80,4.08,4.21,4.35 μm七个波段的激光传输及损耗特性。结果显示,该光纤可实现2.6~4.08 μm波段低损耗导光,在3.27 μm传输损耗最低,为0.037 dB/m。光纤在4.08 μm和4.35 μm处的传输损耗分别为3.200 dB/m 和0.788 dB/m,而该波段熔融石英吸收损耗分别高达1000 dB/m 和3000 dB/m。研究结果证明,空芯反谐振光纤在中红外激光柔性传输领域拥有巨大潜力。
光纤光学 空芯反谐振光纤 中红外激光 激光传输 激光与光电子学进展
2022, 59(3): 0306004
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