Author Affiliations
Abstract
1 School of Information Science and Engineering, Shandong University, Qingdao 266237, China
2 School of Physics and Technology, University of Jinan, Jinan 250022, China
We report VOx nanocomposite as a novel saturable absorber for the first time, to the best of our knowledge. The efficient nonlinear absorption coefficient and the modulation depth are determined by the Z-scan technology. As a saturable absorber, a passively Q-switched Nd-doped bulk laser at 1.34 µm is demonstrated, producing the shortest pulse duration of 129 ns at a repetition rate of 274 kHz. In the passively Q-switched Tm:YLF laser with the prepared saturable absorber, the shortest pulse duration was 292 ns with a repetition rate of 155 kHz. Our work confirmed the saturable absorption in VOx for possible optical modulation in the near-infrared region.
nonlinear optical properties saturable absorber VOx/NaVO3 composite Q-switching Chinese Optics Letters
2022, 20(5): 051601
1 山东大学信息科学与工程学院, 山东 青岛 266237
2 山东大学晶体材料研究所, 山东 济南 250100
时至今日,非线性光学材料在光电子、通信、信息处理等领域的重要作用日益突出,发展新型、优良的非线性光学材料迫在眉睫。与传统的无机非线性光学材料相比,有机非线性光学材料在损伤阈值、响应时间和非线性光学系数上具有决定性优势。沸石咪唑酯骨架结构材料(ZIFs)是一类以咪唑或其衍生物为配体的特殊金属有机骨架结构材料,其以结构多样性、高度的热学和化学稳定性,近年来受到了国内外研究者的关注。本文总结了沸石咪唑酯骨架结构材料制备方法以及非线性光学特性的研究进展,并就沸石咪唑酯骨架结构材料在非线性光学领域的应用前景进行了展望。
材料 非线性光学材料 纳米材料 金属有机纳米骨架 沸石咪唑酯骨架结构 调Q 中国激光
2021, 48(12): 1203001
商景诚 1,2,3刘一州 1,2赵圣之 1,2冯天利 1,2,3,*[ ... ]李涛 1,2,3,**
1 山东大学信息科学与工程学院, 山东 青岛 266237
2 山东大学山东省激光技术与应用重点实验室, 山东 青岛 266237
3 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
4 山东大学晶体材料研究所, 山东 济南 250100
光参量啁啾脉冲放大器(OPCPA)在实现高功率、大能量、光学周期量级的超短激光脉冲输出方面极具优势。对具有高脉冲重复频率(≥1 kHz)的OPCPA系统展开研究讨论,全面介绍OPCPA系统的组成;针对不同波段的OPCPA系统,对泵浦源、前端、光参量放大级和压缩器等关键模块分别进行对比和讨论,对限制OPCPA系统性能提升的因素进行分析;最后总结不同输出波长的高重复频率OPCPA系统的研究现状,并对未来的发展方向进行展望。
激光技术 光参量啁啾脉冲放大器 超快激光 高功率 高重复频率 光学周期 中国激光
2021, 48(12): 1201004
Author Affiliations
Abstract
1 School of Information Science and Engineering, and Shandong Provincial Key Laboratory of Laser Technology and Application, Shandong University, Qingdao 266237, China
2 Key Laboratory of Micro-Nano Measurement-Manipulation and Physics (Ministry of Education), Department of Applied Physics, Beihang University, Beijing 100191, China
3 Shenzhen Research Institute of Shandong University, Shenzhen 518057, China
4 State Key Laboratory of Crystal Materials, Institute of Crystal Materials, Shandong University, Jinan 250100, China
5 Key Laboratory of Transparent and Opto-Functional Inorganic Materials, Artificial Crystal Research Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, China
6 School of Physics Science and Engineering, Institute for Advanced Study, Tongji University, Shanghai 200092, China
A dual-wavelength synchronously mode-locked homogeneously broadened bulk laser operating at 1985.6 and 1989 nm is presented for the first time, to the best of our knowledge, which delivers a maximum output power of 166 mW and a repetition rate of 85 MHz. The pulse duration was measured to be 16.8 ps by assuming a pulse shape. The recorded autocorrelation trace showed frequency beating signals with an interval of 3.8 ps and a full width at half-maximum duration of 2 ps, corresponding to an ultrahigh beating frequency of about 0.26 THz, which agrees well with the frequency difference of the emitted two spectral peaks. The results indicated that such a kind of dual-wavelength mode-locked Tm:YAlO3 laser could be potentially used for generating terahertz radiations.
140.4050 Mode-locked lasers 140.3580 Lasers, solid-state 140.3070 Infrared and far-infrared lasers Chinese Optics Letters
2019, 17(9): 091401
Author Affiliations
Abstract
1 School of Information Science and Engineering, and Shandong Provincial Key Laboratory of Laser Technology and Application, Shandong University, Qingdao 266237, China
2 Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
Gold nanorods (GNRs) with two different aspect ratios were successfully utilized as saturable absorbers (SAs) in a passively Q-switched neodymium-doped lutetium lithium fluoride (Nd:LLF) laser emitting at 1.34 μm. Based on the GNRs with an aspect ratio of five, a maximum output power of 1.432 W was achieved, and the narrowest pulse width was 328 ns with a repetition rate of 200 kHz. But, in the case of the GNRs with the aspect ratio of eight, a maximum output power of 1.247 W was achieved, and the narrowest pulse width was 271 ns with a repetition rate of 218 kHz. Our experimental results reveal that the aspect ratios of GNRs have different saturable absorption effects at a specific wavelength. In other words, for passively Q-switched lasers at a given wavelength, we are able to select the most suitable GNRs as an SA by changing their aspect ratio.
140.3480 Lasers, diode-pumped 140.3540 Lasers, Q-switched 140.3070 Infrared and far-infrared lasers Chinese Optics Letters
2019, 17(4): 041401
1 济南大学 理学院,山东 济南 250022
2 山东大学 信息科学与工程学院,山东 济南 250100
采用激光二极管( LD) 抽运c轴切割的Nd:GdVO4晶体,声光调制器作为主动调Q开关,Cr4+:YAG饱和吸收体作为被动调Q开关,实现了声光Cr4+:YAG 主被动双调Q 1.06 μm 激光运转。实验结果表明,通过改变声光调制器和Cr4+:YAG饱和吸收体在谐振腔内的位置,可以有效地控制脉冲宽度,同时获得了双调Q激光的单脉冲能量、峰值功率的变化范围。根据ABCD矩阵传输理论计算得出的腔内模式半径沿腔轴的变化关系,考虑腔内振荡光强的空间高斯分布以及声光调制的渡越时间,给出了LD抽运声光Cr4+:YAG主被动双调Q激光的耦合速率方程组,理论计算与实验结果相符。
激光技术 激光二极管抽运 声光调Q开关 脉冲宽度 高斯分布 速率方程组
1 山东大学 光学工程系,济南 251000
2 中国工程物理研究院 激光聚变研究中心,绵阳 621900
为了研究高功率光纤放大器的工作特性,采用两级光纤放大器对整形脉冲进行放大,得到放大后的脉冲能量为10μJ、峰值功率为2.4kW。发现当抽运功率高于1.4W时,输出功率变得很不稳定,甚至出现了能量很高的巨脉冲。模拟了掺Yb3+大模场光纤放大器,模拟结果与实验结果吻合较好。结果表明,信号光峰值功率放大到几千瓦时尚未饱和,光纤内仍有很多剩余储能,重新对放大器的设计进行优化,可以获得更高的能量。
光纤光学 掺Yb3+光纤 大模场光纤放大器 数值模拟 巨脉冲 fiber optics Yb-doped fiber large-mode-fiber amplifier simulation giant pulse
1 济南大学理学院, 山东 济南 250022
2 中材高新材料股份有限公司, 山东 淄博 255000
3 山东大学信息科学与工程学院, 山东 济南 250100
采用光纤耦合半导体激光抽运,实现了Cr4+∶Nd3+∶YAG自锁模自调Q激光器1.06 μm 激光输出。当抽运功率超过阈值2.83 W时,激光器便运转在调Q锁模状态,其锁模调制深度达到80%以上。当抽运功率最大为5.72 W时,平均输出功率为233 mW,相应调Q包络的单脉冲能量为16.5 μJ,调Q包络的脉冲宽度大约为120 ns。调Q包络中锁模脉冲之间的间隔为2.8 ns,这与光子在谐振腔内的往返时间相一致,对应的重复率为357 MHz,锁模脉冲宽度估计为560 ps。利用双曲正割函数,考虑腔内光子数密度的空间高斯分布、增益介质的受激辐射寿命和饱和吸收体的激发态寿命对激光特性的影响,建立了描述Cr4+∶Nd3+∶YAG晶体自调Q自锁模动力学过程的速率方程组。数值求解该方程组,与实验结果符合较好。
激光器 自锁模 自调Q Cr4+∶Nd3+∶YAG晶体 速率方程
1 山东大学威海分校 信息工程学院，威海 264209
2 山东大学 信息学院，济南 250100
为了研究调Q激光脉冲波型的对称性，利用电光调制和GaAs半导体饱和吸收体，实现了电光－GaAs主被动双调Q激光运转。与单一电光主动调Q或GaAs被动调Q激光对比，双调Q激光的脉冲宽度更窄、脉冲波型更对称，其脉冲宽度的压缩比大于40%。定义了一个对称因子来描述脉冲波型的对称性，对称性的改善优于10%。在平面波近似下，给出了双调Q激光运转的耦合方程组，数值求解方程组得到的理论值与实验结果相符。
激光技术 双调Q 脉冲宽度 脉冲对称性 数值解 laser technique double Q-switched pulse width pulse symmetry numerical solution
1 山东大学 信息学院，济南 250100
2 山大鲁能中晶公司，济南 250100
为了分析影响双块晶体电光开关消光比的各项因素，采用折射率椭球方法，进行了理论分析和实验验证。结果表明，两晶体通光方向偏差及偏振器件透振方向偏差对消光比影响较大，只要仔细调解上述两方面就能实现较好的电光调Q效果。
光学器件 消光比分析 折射率椭球法 双晶体 optical devices contrast-ratio analysis index-ellipsoid method double crystals
