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学者姓名：李强
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| GB/T 7714 | Li, Guotai , Han, Jiakun , Li, Shuai et al. Nonlinear-mirror mode-locked crystal waveguide laser by intracavity fourth-harmonic loss modulation (vol 48, pg 6064, 2024) [J]. | OPTICS LETTERS , 2024 , 49 (7) : 1810-1810 . |
| MLA | Li, Guotai et al. "Nonlinear-mirror mode-locked crystal waveguide laser by intracavity fourth-harmonic loss modulation (vol 48, pg 6064, 2024)" . | OPTICS LETTERS 49 . 7 (2024) : 1810-1810 . |
| APA | Li, Guotai , Han, Jiakun , Li, Shuai , Zhao, Jing , Zhu, Zhanda , Hui, Yongling et al. Nonlinear-mirror mode-locked crystal waveguide laser by intracavity fourth-harmonic loss modulation (vol 48, pg 6064, 2024) . | OPTICS LETTERS , 2024 , 49 (7) , 1810-1810 . |
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Abstract ：
We report an effective method to reduce the impact of polarization state changes caused by thermal birefringence in intra-cavity frequency-doubled laser. The laser consists of a diode side pumped Nd:YAG module, an acousto-optic modulator Q-switch, and an LBO crystal used for SHG generation in 532 nm laser. The effect of thermal birefringence originated by the Nd:YAG rod with concave-shape end surfaces on SHG efficiency is compensated by the insertion of a lambda/8 plate into the cavity. At the repetition frequency of 9 kHz, the 532 nm laser achieves a maximum output power of 23.8 W, a pulse duration of 60 ns (FWHM), and a beam quality factor of Mx 2 x My 2 = 1.52 x 1.43. Compared with the lambda/4 plate and without plate, the maximum average power of the laser with the lambda/8 plate has increased by 22.7% and 66.4%, respectively, the beam quality factor has also been greatly improved correspondingly. This method provides a new solution for lasers to compensate thermally induced birefringence.
Keyword ：
intra-cavity frequency doubling intra-cavity frequency doubling power escalation power escalation birefringence compensation birefringence compensation
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| GB/T 7714 | Li, Shuai , Fang, Zijun , Peng, Majun et al. Power scaling of intra-cavity Nd:YAG/LBO laser at 532 nm by birefringence compensation [J]. | LASER PHYSICS LETTERS , 2024 , 21 (8) . |
| MLA | Li, Shuai et al. "Power scaling of intra-cavity Nd:YAG/LBO laser at 532 nm by birefringence compensation" . | LASER PHYSICS LETTERS 21 . 8 (2024) . |
| APA | Li, Shuai , Fang, Zijun , Peng, Majun , Zhu, Zhanda , Lei, Hong , Li, Qiang . Power scaling of intra-cavity Nd:YAG/LBO laser at 532 nm by birefringence compensation . | LASER PHYSICS LETTERS , 2024 , 21 (8) . |
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Abstract ：
目前1.5μm激光二极管(Laser Diode,LD)泵浦的铒镱共掺玻璃/晶体被动调Q微型激光器广泛应用于激光测距、激光雷达等领域。随着激光器输出重频的增加，玻璃面临突出的热效应问题，晶体的热导率是玻璃的10倍以上，有望能够实现比玻璃基质更高重频的激光输出。报道了一种通过LD脉冲端面泵浦Er~(3+)/Yb~(3+):Lu_2Si_2O_7晶体的百kHz人眼安全激光器。通过实验优化增益介质掺杂浓度和长度、泵浦光斑尺寸和调Q晶体初始透过率等实验参数，同时适当缩短脉宽，优化泵浦占空比，提高了输出重频的稳定性。最终获得了重频为100 kHz、单脉冲能量0.7μJ、脉冲宽度240 ns、光束质量M~2=1.61的1 537 nm脉冲激光输出。实现了输出脉冲频率与泵浦的一致，保证了输出重频的稳定性，有效解决了输出重频具有随机性、不稳定、不可控等问题。
Keyword ：
百kHz 百kHz 脉冲泵浦 脉冲泵浦 固体激光器 固体激光器 Er~(3+)/Yb~(3+):Lu_2Si_2O_7晶体 Er~(3+)/Yb~(3+):Lu_2Si_2O_7晶体 被动调Q 被动调Q
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| GB/T 7714 | 彭嘉宁 , 韩雪 , 聂霄璐 et al. LD脉冲泵浦Er~(3+)/Yb~(3+):Lu_2Si_2O_7晶体百kHz激光器 [J]. | 红外与激光工程 , 2024 , 53 (08) : 59-65 . |
| MLA | 彭嘉宁 et al. "LD脉冲泵浦Er~(3+)/Yb~(3+):Lu_2Si_2O_7晶体百kHz激光器" . | 红外与激光工程 53 . 08 (2024) : 59-65 . |
| APA | 彭嘉宁 , 韩雪 , 聂霄璐 , 高翔 , 朱占达 , 雷訇 et al. LD脉冲泵浦Er~(3+)/Yb~(3+):Lu_2Si_2O_7晶体百kHz激光器 . | 红外与激光工程 , 2024 , 53 (08) , 59-65 . |
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Abstract ：
报道了一种基于光谱合束的Nd:YAG固体激光器双波长光源。系统由两个固体Nd:YAG脉冲激光器通过光谱合束组合而成，两个固体Nd:YAG脉冲激光器可独立工作，有利于输出脉冲的波长调谐、功率调节和相对延迟调整。通过光栅的色散特性以及输出镜的共同外腔反馈将各个激光器锁定在不同波长，从而实现合束，获得的激光源中心波长锁定在1 061.5 nm和1 064.6 nm，两谱线中心间距为3.1 nm，组合光束的输出能量为173 mJ，组合光束的光束质量因子M~2为2.8×2.2；两个Nd:YAG激光器独立工作的输出能量分别为94 mJ和92 mJ，在合束方向上的光束质量因子M~2分别为2.7和2.1，在非合束方向上的光束质量因子M~2分别为2.2和1.9；组合光束的输出能量为两个Nd:YAG激光器能量总和的93%，组合光束的光束质量因子与单个Nd:YAG激光束的光束质量因子M~2基本相同。该双波长激光源满足波长间隔小、输出功率大小相近、同光轴等要求，在太赫兹波产生、测速激光雷达以及医疗仪器等应用领域具有重要作用。
Keyword ：
光谱合束 光谱合束 光束质量 光束质量 Nd:YAG激光器 Nd:YAG激光器 双波长 双波长 输出能量 输出能量
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| GB/T 7714 | 王路达 , 吴伟冲 , 朱占达 et al. 基于光谱合束的双波长输出Nd:YAG固体激光器 [J]. | 红外与激光工程 , 2024 , 53 (01) : 129-134 . |
| MLA | 王路达 et al. "基于光谱合束的双波长输出Nd:YAG固体激光器" . | 红外与激光工程 53 . 01 (2024) : 129-134 . |
| APA | 王路达 , 吴伟冲 , 朱占达 , 白振旭 , 惠勇凌 , 雷訇 et al. 基于光谱合束的双波长输出Nd:YAG固体激光器 . | 红外与激光工程 , 2024 , 53 (01) , 129-134 . |
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Abstract ：
为了抑制高功率非线性镜锁模激光器的调Q不稳定性，提出了一种双晶体二次倍频非线性镜结构，通过加入第二块非线性晶体将二次谐波倍频为四次谐波来产生损耗，从而实现非线性反射率的提前饱和。该结构降低了非线性镜锁模器件的饱和峰值功率密度和调制深度，从而降低连续锁模阈值，得到稳定的连续锁模输出。通过理论分析这种非线性镜结构抑制调Q不稳定性的原理和表达，并使用大芯径晶体方波导作为增益介质，进一步搭建实验，验证了这一结构的可行性。最终实验获得了功率为26.5 W、重复频率为32.2 MHz、脉宽为0.95 ps的连续锁模脉冲输出。实验结果表明，这种高功率非线性镜锁模激光器结构简单、稳定可靠，并且该器件在高功率锁模激光器的发展中具有巨大潜力。
Keyword ：
锁模 锁模 调Q 调Q 高功率 高功率 晶体波导 晶体波导 非线性镜锁模 非线性镜锁模 连续锁模 连续锁模
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| GB/T 7714 | 韩佳坤 , 李国泰 , 李帅 et al. 抑制调Q不稳定性的非线性镜锁模激光器 [J]. | 中国激光 , 2024 , 51 (14) : 54-61 . |
| MLA | 韩佳坤 et al. "抑制调Q不稳定性的非线性镜锁模激光器" . | 中国激光 51 . 14 (2024) : 54-61 . |
| APA | 韩佳坤 , 李国泰 , 李帅 , 赵静 , 朱占达 , 雷訇 et al. 抑制调Q不稳定性的非线性镜锁模激光器 . | 中国激光 , 2024 , 51 (14) , 54-61 . |
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Abstract ：
High slope efficiency 3 mu m laser output exceeding Stokes limit is demonstrated in Er:YAG crystals with lower doping concentration at room temperature. Based on cyclic cascaded cavity, several parameters affecting slope efficiency are optimized. Under the optimized configuration, slope efficiencies up to 36.5% and 37.2%, exceeding the Stokes efficiency of 33%, are achieved in 10at.% and 25at.% Er:YAG crystals, respectively. The realization of high slope efficiency paves the way for improving the average power of 3 mu m lasers.
Keyword ：
Er Er Cyclic cascade Cyclic cascade YAG crystals YAG crystals Mid -infrared lasers Mid -infrared lasers
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| GB/T 7714 | Wang, Sibo , Tian, Ye , Qu, Bo et al. High slope efficiency 3?m Er:YAG cyclic cascade pulsed lasers [J]. | OPTICS AND LASER TECHNOLOGY , 2023 , 158 . |
| MLA | Wang, Sibo et al. "High slope efficiency 3?m Er:YAG cyclic cascade pulsed lasers" . | OPTICS AND LASER TECHNOLOGY 158 (2023) . |
| APA | Wang, Sibo , Tian, Ye , Qu, Bo , Zhu, Zhanda , Hui, Yongling , Lei, Hong et al. High slope efficiency 3?m Er:YAG cyclic cascade pulsed lasers . | OPTICS AND LASER TECHNOLOGY , 2023 , 158 . |
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Abstract ：
We present a dual-wavelength laser source obtained by spectral beam combining of two solid-state Nd:YAG pulsed lasers. The central wavelengths were locked at 1061.5 and 1064.6 nm. The output energy was the sum of the energy of the individually locked Nd:YAG lasers. The beam quality M2 of the combined beam is 2.8 x 2.2, which is nearly the same as that of a single Nd:YAG laser beam. This work should be helpful to provide an effective dual-wavelength laser source for applications. (c) 2023 Optica Publishing Group
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| GB/T 7714 | Zhu, Zhanda , Wu, Weichong , Wang, Luda et al. Dual-wavelength laser source by spectral beam combining of two Nd:YAG pulse lasers [J]. | APPLIED OPTICS , 2023 , 62 (8) : 1939-1942 . |
| MLA | Zhu, Zhanda et al. "Dual-wavelength laser source by spectral beam combining of two Nd:YAG pulse lasers" . | APPLIED OPTICS 62 . 8 (2023) : 1939-1942 . |
| APA | Zhu, Zhanda , Wu, Weichong , Wang, Luda , Hui, Yongling , Lei, Hong , Li, Qiang . Dual-wavelength laser source by spectral beam combining of two Nd:YAG pulse lasers . | APPLIED OPTICS , 2023 , 62 (8) , 1939-1942 . |
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Abstract ：
The nonlinear transmission curves of the Co2+ : MgAl2O4 crystal at 1.5 mu m are experimentally measured by the pump-probe technique. The measurement results demonstrate that the transition into the near-infrared absorption band is polarized not only along the C-3 local symmetry axis, but also along the direction perpendicular to the C-3 axis, arising from the distortion of oxygen tetrahedrons about the Co2+ ions along the four C-3 local symmetry axes. The obtained saturation curves are analyzed using a theoretical model taking into account the transition of Co2+ ions along two orthogonal directions. The ground-state absorption cross sections for polarization parallel and perpendicular to the C-3 axis are calculated to be 3.4 x 10(-19) cm(2) and 2.6 x 10(-20) cm(2), respectively. The excited-state absorption cross section for polarization parallel to the C-3 axis is estimated to be 4.2 x 10(-20) cm(2). (C) 2022 Optica Publishing Group
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| GB/T 7714 | Wang, Yu , Wu, Weichong , Zhu, Zhanda et al. Measurement of absorption cross sections of Co2+: MgAl2O4 crystals with transition of Co2+ ions along two orthogonal directions [J]. | APPLIED OPTICS , 2022 , 61 (8) : 1918-1923 . |
| MLA | Wang, Yu et al. "Measurement of absorption cross sections of Co2+: MgAl2O4 crystals with transition of Co2+ ions along two orthogonal directions" . | APPLIED OPTICS 61 . 8 (2022) : 1918-1923 . |
| APA | Wang, Yu , Wu, Weichong , Zhu, Zhanda , Hui, Yongling , Lei, Hong , Li, Qiang . Measurement of absorption cross sections of Co2+: MgAl2O4 crystals with transition of Co2+ ions along two orthogonal directions . | APPLIED OPTICS , 2022 , 61 (8) , 1918-1923 . |
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Abstract ：
The performance of a novel, to the best of our knowledge, high-power Yb:YAG planar waveguide amplifier under thermal steady-state is studied numerically. We present a 3D thermal steady-state amplification model, which considers the effects of temperature on the Boltzmann occupation factors, pump absorption, and laser emission cross sections, in addition to reabsorption and pump saturation of Yb:YAG. The performance of a multipass-pumped planar waveguide amplifier under thermal steady-state was simulated considering the loss in the claddings, and a comparison with the simulated results under the ideal state was carried out. Our analysis results show that the core's temperature rise and the claddings' pump absorption lead to decreased pump absorption and optical-optical efficiencies. However, a high pump absorption efficiency (96%) and optical-optical efficiency (61.2%) are achieved when the pump power is 10 kW. Meanwhile, a lower fracture and minor thermal distortion can be expected in reality. (C) 2022 Optica Publishing Group
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| GB/T 7714 | Qu, Bo , Wang, Sibo , Zhu, Zhanda et al. Modeling of a high-power continuous wave Yb:YAG planar waveguide amplifier under thermal steady-state [J]. | APPLIED OPTICS , 2022 , 61 (9) : 2247-2255 . |
| MLA | Qu, Bo et al. "Modeling of a high-power continuous wave Yb:YAG planar waveguide amplifier under thermal steady-state" . | APPLIED OPTICS 61 . 9 (2022) : 2247-2255 . |
| APA | Qu, Bo , Wang, Sibo , Zhu, Zhanda , Hui, Yongling , Lei, Hong , Li, Qiang . Modeling of a high-power continuous wave Yb:YAG planar waveguide amplifier under thermal steady-state . | APPLIED OPTICS , 2022 , 61 (9) , 2247-2255 . |
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Abstract ：
Large core diameter crystal waveguides can absorb higher power pump light and achieve higher output power. At the same time, the peak power density in the core layer is relatively low during mode-locking operation, and the accumulation of nonlinear effects is reduced. Based on this, a passively mode-locked picosecond laser based on Yb: YAG large core diameter crystal square waveguide is constructed. In the experiment, firstly, the high mirror is used instead of the semiconductor saturable absorption mirror (SESAM), and the position and angle of the crystal waveguide are adjusted to match the pump light with the waveguide core layer under higher pump power. Then, the angle of the spherical mirror is carefully adjusted to couple the signal light into the waveguide core layer to minimize the loss in the cavity. The designed laser adopts a folded cavity structure, and achieves an average power of 10.2 W, pulse width of 65 ps, repetition rate of 30.15 MHz, and single pulse energy of 0.34 mu J without dispersion compensation device.
Keyword ：
crystal waveguide crystal waveguide lasers lasers semiconductor saturable absorption mirror semiconductor saturable absorption mirror mode locked laser mode locked laser solid-state laser solid-state laser
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| GB/T 7714 | Li Shuai , Li Guotai , Zhang Kailun et al. Semiconductor Saturable Absorption Mirror Mode-Locked Laser Based on Large Core Size Crystal Waveguide [J]. | ACTA OPTICA SINICA , 2022 , 42 (10) . |
| MLA | Li Shuai et al. "Semiconductor Saturable Absorption Mirror Mode-Locked Laser Based on Large Core Size Crystal Waveguide" . | ACTA OPTICA SINICA 42 . 10 (2022) . |
| APA | Li Shuai , Li Guotai , Zhang Kailun , Zhu Zhanda , Hui Yongling , Lei Hong et al. Semiconductor Saturable Absorption Mirror Mode-Locked Laser Based on Large Core Size Crystal Waveguide . | ACTA OPTICA SINICA , 2022 , 42 (10) . |
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