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学者姓名：李强
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Abstract ：
We report what we believe to be a novel circular-clad large- size rectangular core crystalline waveguide Yb:YAG laser. The waveguide has a rectangular core of Yb:YAG with 400 x 400 mu m2 and a thin rod-shaped cladding of Er:YAG with a diameter of 1.2 mm and a length of 65 mm. The circular-clad structure has improved the pump absorption efficiency of the waveguide. A concave-convex cavity is designed to overcome the power limitation of thermal lens effect on the large-size rectangular core single-mode waveguide. A waveguide oscillator obtains a 1030 nm laser with an average power of 110 W and a beam quality factor of Mx2xMy2 =1.07 x 1.05, with optical-optical efficiency and slope efficiency of 54% and 67%, respectively. The laser performance is attributed to the double-clad structure and the good thermal management. The results confirm that the waveguide has high potential in power expansion and pulse laser amplification. (c) 2025 Optica Publishing Group. All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.
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| GB/T 7714 | Li, Shuai , Huang, Yukun , Nie, Xiaolu et al. High-efficiency and high-brightness circular-clad , large-size, rectangular core crystalline waveguide Yb:YAG laser [J]. | OPTICS LETTERS , 2025 , 50 (5) : 1665-1668 . |
| MLA | Li, Shuai et al. "High-efficiency and high-brightness circular-clad , large-size, rectangular core crystalline waveguide Yb:YAG laser" . | OPTICS LETTERS 50 . 5 (2025) : 1665-1668 . |
| APA | Li, Shuai , Huang, Yukun , Nie, Xiaolu , Zhao, Ding , Zhu, Zhanda , Lei, Hong et al. High-efficiency and high-brightness circular-clad , large-size, rectangular core crystalline waveguide Yb:YAG laser . | OPTICS LETTERS , 2025 , 50 (5) , 1665-1668 . |
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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 ：
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 ：
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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| 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 ：
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 ：
Objective Laser diode (LD)-pumped neodymium-doped yttrium aluminum garnet (Nd: YAG) Q-switched laser has the advantages of small volume, lightweight, long service life, and high conversion efficiency. It is widely used in material processing, lidar, and laser ranging. Recently, the development of laser technology has necessitated an increase in the efficiency and output energy of Nd: YAG Q-switched laser. Presently, the output optical-to-optical conversion efficiency of LD-pumped Nd: YAG electro-optical Q-switched laser has been maintained at ~20%. Improving the optical-to-optical conversion efficiency of the laser can effectively reduce the volume and weight of the laser under the same energy output conditions. Various approaches to improve the optical-to-optical conversion efficiency have been reported. One way is to enhance the pump energy absorption. Another way is to reduce energy loss by suppressing amplified spontaneous emission (ASE) and parasitic oscillation to enhance the output optical-to-optical conversion efficiency of Q-switched laser. In this study, we propose a high-efficiency LD corner-side-pumped Nd: YAG electro-optical Q-switched laser using a composite slab laser crystal. By improving the pump light absorption efficiency and suppressing ASE, we improve the output optical-to-optical conversion efficiency of the Nd: YAG electro-optical Q-switched laser. We hope that our research can be helpful in improving the output energy and efficiency of Q-switched solid-state lasers. Methods This study is based on a composite slab laser crystal. First, the gain medium is a Nd: YAG crystal with atomic fraction of 0.1% and cross section size of 4 mm×4 mm. Four pieces of Sm: YAG crystals with atomic fraction of 3% and thickness of 1 mm are thermally bonded around the side surfaces of the Nd: YAG crystal to inhibit ASE and parasitic oscillation. Next, undoped YAG bulk crystals are sequentially bonded to the Sm: YAG crystal. Then, we determin the size of the composite slab laser crystal. Note that using an improved corner-side hybrid pump structure achieves a high absorption efficiency for the pump light by crossing through the active media Nd: YAG 13 times. Next, from the ray-tracing method, we analyse the absorption efficiency and pump uniformity of the pump light using the non-sequential mode of ZEMAX simulation software. The electro-optical Q-switched system is used to study the output of the Q-switching experiment. Furthermore, the variation between free output and Q-switched output energy versus input current is studied. The optical-to-optical conversion efficiency of Q-switched output at different input currents and the dynamic-to-static ratio at the highest output efficiency are calculated. Finally, the pulse width, beam quality, and far-field spot of the laser are measured. Results and Discussions The free-running and Q-switched pulse outputs of the laser are measured when the pump pulse width is 230 μs and the repetition rate is 5 Hz. When the pump current is 180 A, the laser operates freely and obtains the maximum output single pulse energy of 124 mJ. With the increase in pump current, the output optical-to-optical conversion efficiency of the Q-switched pulse laser increases and then decreases. At the pump current of 170 A, we obtain the highest optical-to-optical efficiency which is 30.1%. Furthermore, the dynamic-to-static ratio is as high as 94. 64% (Fig. 4). We detect the Q-switched pulse waveform using a photodetector at an output energy of 106 mj and the detected pulse width is 15 ns [Fig. 5 (a) ]. Additionally, we use a wedge prism to sample the output laser beam with repetition rate of 5 Hz and a single pulse energy of 106 mJ, and the output beam is focused by a lens with a focal length of 150 mm. Also, a charge-coupled device beam analyzer is used to measure the beam quality factor. After the measurement, the beam quality factors of M2X = 4.43 and M2y=4.79 are obtained [Fig. 5 (b) ]. Conclusions In this paper, we investigate and experimentally design an LD corner-side-pumped Nd: YAG electro-optical Q-switched laser, and we realize a high-efficiency 1064 nm pulse laser output. The use of a novel corner-side hybrid pump structure gives high absorption efficiency of pump light. Furthermore, four pieces of Sm: YAG crystals are bounded around the active medium Nd: YAG to suppress parasitic oscillation and effectively reduce ASE. Finally, we obtain a single pulse energy of 106 mJ and pulse width of 15 ns in the Q-switching mode under conditions of a pulse repetition rate of 5 Hz and a pump width of 230 μs. Also, the optical-to-optical conversion efficiency is 30.1% and the dynamic-to-static ratio is 94.64%. The experimental results show that the composite slab laser crystal structure realizes high-efficiency absorption of pump light and effectively suppresses ASE and parasitic oscillation. Thus, our proposed method provides an effective method for high-efficiency 1064 nm Q-switched pulse laser output. © 2022 Science Press. All rights reserved.
Keyword ：
amplified spontaneous radiation amplified spontaneous radiation lasers lasers electro-optical Q-switching electro-optical Q-switching Nd:YAG Nd:YAG
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| GB/T 7714 | Lv, S. , Zhu, Z. , Liu, D. et al. High-Efficiency LD Corner-Side-Pumped Nd∶YAG Electro-Optical Q-Switched Laser [高效率LD角侧泵浦Nd∶YAG电光调Q激光器] [J]. | Chinese Journal of Lasers , 2022 , 49 (17) . |
| MLA | Lv, S. et al. "High-Efficiency LD Corner-Side-Pumped Nd∶YAG Electro-Optical Q-Switched Laser [高效率LD角侧泵浦Nd∶YAG电光调Q激光器]" . | Chinese Journal of Lasers 49 . 17 (2022) . |
| APA | Lv, S. , Zhu, Z. , Liu, D. , Hui, Y. , Lei, H. , Li, Q. . High-Efficiency LD Corner-Side-Pumped Nd∶YAG Electro-Optical Q-Switched Laser [高效率LD角侧泵浦Nd∶YAG电光调Q激光器] . | Chinese Journal of Lasers , 2022 , 49 (17) . |
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Abstract ：
Cascaded mid-infrared (MIR) Er : YAG pulsed lasers at room temperature are reported. The characteristic wavelength of the cascaded emission is experimentally observed to be 1469 nm, and that of the excited-state absorption is determined as 1676 nm. Er: YAG crystals with doping concentrations (atomic number fractions) of 7.5% and 10% are adopted to compare the MIR output energy under the cascade and non-cascade conditions. For the Er: YAG with a doping concentration of 7. 5 , the maximum single pulse energy of MIR laser increases from 0.62 mJ (non-cascade) to 0. 99 mJ (cascade), increasing by about 59. 7%, and for Er : YAG with a doping concentration of 10%, that increases from 1. 04 mJ (non-cascade) to 1. 51 mJ (cascade), increasing by about 45.2%. The experimental results confirm the existence of cascade output at room temperature in low-doped Er: YAG crystals. The cascade is helpful to improve the single pulse energy of the mid-infrared laser.
Keyword ：
Er3+ laser Er3+ laser excited-state absorption excited-state absorption mid-infrared laser mid-infrared laser lasers lasers cascade cascade
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| GB/T 7714 | Wang Sibo , Tian Ye , Qu Bo et al. Experimental Exploration of Er: YAG Cascaded Pulsed Laser at Room Temperature [J]. | ACTA OPTICA SINICA , 2022 , 42 (9) . |
| MLA | Wang Sibo et al. "Experimental Exploration of Er: YAG Cascaded Pulsed Laser at Room Temperature" . | ACTA OPTICA SINICA 42 . 9 (2022) . |
| APA | Wang Sibo , Tian Ye , Qu Bo , Zhu Zhanda , Hui Yongling , Lei Hong et al. Experimental Exploration of Er: YAG Cascaded Pulsed Laser at Room Temperature . | ACTA OPTICA SINICA , 2022 , 42 (9) . |
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