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Efficient dual-stage all-solid-state post-compression for 100 W level ultrafast lasers 用于 100 W 级超快激光器的高效双级全固态后压缩技术
IF 4.8 1区 物理与天体物理 Q1 OPTICS Pub Date : 2024-08-27 DOI: 10.1017/hpl.2024.26
Zichen Gao, Jie Guo, Yongxi Gao, Yuguang Huang, Zhihua Tu, Xiaoyan Liang

We demonstrate efficient and economical all-solid-state post-compression based on dual-stage periodically placed thin fused silica plates driven by a more than 100 W ytterbium-doped yttrium aluminum garnet Innoslab amplifier seeded by a fiber frontend. Not only is a more than eight-fold pulse compression with 94% transmission achieved, but also the pulse quality and spatial mode are improved, which can be attributed to the compensation for the residual high-order dispersion and the spatial mode self-cleaning effect during the nonlinear process. It enables a high-power ultrafast laser source with 64 fs pulse duration, 96 W average power at 175 kHz repetition rates and good spatiotemporal quality. These results highlight that this all-solid-state post-compression can overcome the bandwidth limitation of Yb-based lasers with exceptional efficiency and mitigate the spatiotemporal degradation originating from the Innoslab amplifier and fiber frontend, which provides an efficient and economical complement for the Innoslab laser system and facilitates this robust and compact combination as a promising scheme for high-quality higher-power few-cycle laser generation.

我们展示了高效、经济的全固态后压缩技术,该技术基于双级周期性放置的熔融石英薄板,由光纤前端播种的功率超过 100 W 的掺镱钇铝石榴石 Innoslab 放大器驱动。不仅实现了超过 8 倍的脉冲压缩和 94% 的传输率,而且脉冲质量和空间模式也得到了改善,这归功于非线性过程中对残余高阶色散的补偿和空间模式自清洁效应。它实现了高功率超快激光源,脉冲持续时间为 64 fs,在 175 kHz 重复频率下平均功率为 96 W,并具有良好的时空质量。这些结果表明,这种全固态后压缩技术能够以卓越的效率克服掺镱激光器的带宽限制,并减轻 Innoslab 放大器和光纤前端产生的时空劣化,从而为 Innoslab 激光系统提供了高效、经济的补充,并使这种坚固耐用的紧凑型组合成为产生高质量、高功率、少周期激光的理想方案。
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引用次数: 0
Compression and acceleration processes of spherical shells in gold cones 金锥中球壳的压缩和加速过程
IF 4.8 1区 物理与天体物理 Q1 OPTICS Pub Date : 2024-04-29 DOI: 10.1017/hpl.2024.24
Huigang Wei, Dawei Yuan, Shaojun Wang, Ye Cui, Xiaohu Yang, Yanyun Ma, Zhe Zhang, Xiaohui Yuan, Jiayong Zhong, Neng Hua, Yutong Li, Jianqiang Zhu, Gang Zhao, Jie Zhang

Double-cone ignition [Zhang et al., Phil. Trans. R. Soc. A 378, 20200015 (2020)] was proposed recently as a novel path for direct-drive inertial confinement fusion using high-power lasers. In this scheme, plasma jets with both high density and high velocity are required for collisions. Here we report preliminary experimental results obtained at the Shenguang-II upgrade laser facility, employing a CHCl shell in a gold cone irradiated with a two-ramp laser pulse. The CHCl shell was pre-compressed by the first laser ramp to a density of 3.75 g/cm3 along the isentropic path. Subsequently, the target was further compressed and accelerated by the second laser ramp in the cone. According to the simulations, the plasma jet reached a density of up to 15 g/cm3, while measurements indicated a velocity of 126.8 ± 17.1 km/s. The good agreements between experimental data and simulations are documented.

双锥点火[Zhang 等人,Phil. Trans. R. Soc. A 378, 20200015 (2020)]是最近提出的利用大功率激光器直接驱动惯性约束聚变的新途径。在这个方案中,碰撞需要高密度和高速度的等离子体射流。在此,我们报告了在神光-II 升级版激光设备上获得的初步实验结果,该设备采用了在金锥体中使用双斜坡激光脉冲照射 CHCl 壳体的方法。CHCl 壳体在第一个激光斜坡沿等熵路径被预压缩到 3.75 g/cm3 的密度。随后,目标在锥体中被第二个激光斜坡进一步压缩和加速。根据模拟结果,等离子体射流的密度高达 15 g/cm3,而测量结果显示其速度为 126.8 ± 17.1 km/s。实验数据与模拟结果之间的良好一致性得到了证实。
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引用次数: 0
Precise mode control of mid-infrared high-power laser diodes using on-chip advanced sawtooth waveguide designs 利用片上先进锯齿波导设计实现中红外高功率激光二极管的精确模式控制
IF 4.8 1区 物理与天体物理 Q1 OPTICS Pub Date : 2024-04-26 DOI: 10.1017/hpl.2024.23
Jianmei Shi, Chengao Yang, Yihang Chen, Tianfang Wang, Hongguang Yu, Juntian Cao, Zhengqi Geng, Zhiyuan Wang, Haoran Wen, Hao Tan, Yu Zhang, Dongwei Jiang, Donghai Wu, Yingqiang Xu, Haiqiao Ni, Zhichuan Niu

Power scaling in conventional broad-area (BA) lasers often leads to the operation of higher-order lateral modes, resulting in a multiple-lobe far-field profile with large divergence. Here, we report an advanced sawtooth waveguide (ASW) structure integrated onto a wide ridge waveguide. It strategically enhances the loss difference between higher-order modes and the fundamental mode, thereby facilitating high-power narrow-beam emission. Both optical simulations and experimental results illustrate the significant increase in additional scattering loss of the higher-order modes. The optimized ASW lasers achieve an impressive output power of 1.1 W at 4.6 A at room temperature, accompanied by a minimal full width at half maximum lateral divergence angle of 4.91°. Notably, the far-field divergence is reduced from 19.61° to 11.39° at the saturation current, showcasing a remarkable 42% improvement compared to conventional BA lasers. Moreover, the current dependence of divergence has been effectively improved by 38%, further confirming the consistent and effective lateral mode control capability offered by our design.

传统宽域(BA)激光器的功率扩展通常会导致高阶横向模式的运行,从而产生具有较大发散的多叶远场轮廓。在此,我们报告了一种集成到宽脊波导上的先进锯齿波导(ASW)结构。它从战略上增强了高阶模式与基频模式之间的损耗差,从而促进了高功率窄波束发射。光学模拟和实验结果都表明,高阶模式的额外散射损耗显著增加。优化后的 ASW 激光器在室温下 4.6 A 的输出功率达到了惊人的 1.1 W,全宽半最大横向发散角为 4.91°。值得注意的是,在饱和电流下,远场发散角从 19.61° 减小到 11.39°,与传统 BA 激光器相比显著提高了 42%。此外,发散的电流依赖性也有效改善了 38%,进一步证实了我们的设计具有稳定有效的横向模式控制能力。
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引用次数: 0
Design and optimization methods towards a 10 kW high beam quality fiber laser based on the counter tandem pumping scheme 基于反串联泵浦方案的 10 kW 高光束质量光纤激光器的设计和优化方法
IF 4.8 1区 物理与天体物理 Q1 OPTICS Pub Date : 2024-04-26 DOI: 10.1017/hpl.2024.21
Ruixian Li, Hanshuo Wu, Hu Xiao, Zilun Chen, Jinyong Leng, Liangjin Huang, Zhiyong Pan, Pu Zhou

In this study, we investigated the influence of fiber parameters on stimulated Raman scattering (SRS) and identified a unique pattern of SRS evolution in the counter tandem pumping configuration. Our findings revealed that the SRS threshold in counter-pumping is predominantly determined by the length of the output delivery fiber rather than the gain fiber. By employing the counter tandem pumping scheme and optimizing the fiber parameters, a 10 kW fiber laser was achieved with beam quality M2 of 1.92. No mode instability or severe SRS limitation was observed. To our knowledge, this study achieved the highest beam quality in over 10 kW fiber lasers based on conventional double-clad Yb-doped fiber.

在这项研究中,我们研究了光纤参数对受激拉曼散射(SRS)的影响,并确定了反串联泵浦配置中 SRS 演变的独特模式。我们的研究结果表明,反向泵浦中的 SRS 阈值主要由输出传输光纤的长度而非增益光纤决定。通过采用反串联泵浦方案和优化光纤参数,实现了 10 kW 光纤激光器,光束质量 M2 为 1.92。没有观察到模式不稳定或严重的 SRS 限制。据我们所知,这项研究在基于传统双包层掺镱光纤的 10 kW 光纤激光器中实现了最高的光束质量。
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引用次数: 0
New grating compressor designs for XCELS and SEL-100 PW projects 用于 XCELS 和 SEL-100 PW 项目的新型光栅压缩机设计
IF 4.8 1区 物理与天体物理 Q1 OPTICS Pub Date : 2024-04-01 DOI: 10.1017/hpl.2024.18
Efim Khazanov

The problem of optimizing the parameters of a laser pulse compressor consisting of four identical diffraction gratings is solved analytically. The goal of optimization is to obtain maximum pulse power, completely excluding both beam clipping on gratings and the appearance of spurious diffraction orders. The analysis is carried out in a general form for an out-of-plane compressor. Two particular ‘plane’ cases attractive from a practical point of view are analyzed in more detail: a standard Treacy compressor (TC) and a compressor with an angle of incidence equal to the Littrow angle (LC). It is shown that in both cases the LC is superior to the TC. Specifically, for 160-cm diffraction gratings, optimal LC design enables 107 PW for XCELS and 111 PW for SEL-100 PW, while optimal TC design enables 86 PW for both projects.

通过分析解决了由四个相同衍射光栅组成的激光脉冲压缩器的参数优化问题。优化的目标是获得最大脉冲功率,同时完全排除光栅上的光束削波和杂散衍射阶次的出现。分析以平面外压缩机的一般形式进行。更详细地分析了从实用角度来看具有吸引力的两种特殊 "平面 "情况:标准特雷西压缩器(TC)和入射角等于利特罗角(LC)的压缩器。结果表明,在这两种情况下,LC 都优于 TC。具体地说,对于160厘米衍射光栅,最佳LC设计可使XCELS获得107 PW,SEL-100 PW获得111 PW,而最佳TC设计可使这两个项目获得86 PW。
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引用次数: 0
High-repetition-rate source of nanosecond duration kA-current pulses driven by relativistic laser pulses 由相对论激光脉冲驱动的纳秒级 kA 电流脉冲高重复率源
IF 4.8 1区 物理与天体物理 Q1 OPTICS Pub Date : 2024-03-14 DOI: 10.1017/hpl.2024.14
Michael Ehret, Jakub Cikhardt, Philip Wykeham Bradford, Iuliana-Mariana Vladisavlevici, Tomas Burian, Diego de Luis, Jose Luis Henares, Rubén Hernández Martín, Jon Imanol Apiñaniz, Roberto Lera, José Antonio Pérez-Hernández, João Jorge Santos, Giancarlo Gatti

We report the first high-repetition-rate generation and simultaneous characterization of nanosecond-scale return currents of kA-magnitude issued by the polarization of a target irradiated with a PW-class high-repetition-rate titanium:sapphire laser system at relativistic intensities. We present experimental results obtained with the VEGA-3 laser at intensities from $5times {10}^{18}$ to $1.3times {10}^{20}$ W cm${}^{-2}$. A non-invasive inductive return-current monitor is adopted to measure the derivative of return currents of the order of kA ns${}^{-1}$ and analysis methodology is developed to derive return currents. We compare the current for copper, aluminium and Kapton targets at different laser energies. The data show the stable production of current peaks and clear prospects for the tailoring of the pulse shape, which is promising for future applications in high-energy-density science, for example, electromagnetic interference stress tests, high-voltage pulse response measurements and charged particle beam lensing. We compare the target discharge of the order of hundreds of nC with theoretical predictions and a good agreement is found.

我们首次报告了在相对论强度下用 PW 级高重复率钛蓝宝石激光系统照射目标时产生的高重复率纳秒级返回电流,并同时对其进行了表征。我们介绍了使用 VEGA-3 激光器在 5 美元/次 {10}^{18}$ 到 1.3 美元/次 {10}^{20}$ W cm${}^{-2}$ 的强度下获得的实验结果。我们采用了一种非侵入式感应回波电流监测器来测量 kA ns${}^{-1}$ 量级的回波电流导数,并开发了一套分析方法来推导回波电流。我们比较了不同激光能量下铜、铝和 Kapton 靶件的电流。数据显示了电流峰值的稳定产生以及定制脉冲形状的清晰前景,这对未来高能量密度科学的应用大有可为,例如电磁干扰应力测试、高压脉冲响应测量和带电粒子光束透镜。我们将数百 nC 量级的目标放电与理论预测进行了比较,发现两者吻合得很好。
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引用次数: 0
Generation of polarized electron beams through self-injection in the interaction of a laser with a pre-polarized plasma 在激光与预偏振等离子体的相互作用中通过自注入产生偏振电子束
IF 4.8 1区 物理与天体物理 Q1 OPTICS Pub Date : 2024-02-22 DOI: 10.1017/hpl.2024.7
L. R. Yin, X. F. Li, Y. J. Gu, N. Cao, Q. Kong, M. Büscher, S. M. Weng, M. Chen, Z. M. Sheng

Polarized electron beam production via laser wakefield acceleration in pre-polarized plasma is investigated by particle-in-cell simulations. The evolution of the electron beam polarization is studied based on the Thomas–Bargmann–Michel–Telegdi equation for the transverse and longitudinal self-injection, and the depolarization process is found to be influenced by the injection schemes. In the case of transverse self-injection, as found typically in the bubble regime, the spin precession of the accelerated electrons is mainly influenced by the wakefield. However, in the case of longitudinal injection in the quasi-1D regime (for example, F. Y. Li et al., Phys. Rev. Lett. 110, 135002 (2013)), the direction of electron spin oscillates in the laser field. Since the electrons move around the laser axis, the net influence of the laser field is nearly zero and the contribution of the wakefield can be ignored. Finally, an ultra-short electron beam with polarization of $99%$ can be obtained using longitudinal self-injection.

通过粒子入胞模拟研究了在预极化等离子体中通过激光汪场加速产生的极化电子束。根据横向和纵向自注入的托马斯-巴格曼-米歇尔-特莱格迪方程研究了电子束极化的演变,发现去极化过程受注入方案的影响。在横向自注入的情况下,正如在典型的气泡机制中发现的那样,加速电子的自旋前驱主要受到唤醒场的影响。然而,在准一维系统中的纵向注入情况下(例如,F. Y. Li 等人,Phys.110, 135002 (2013)),电子自旋方向会在激光场中摆动。由于电子围绕激光轴运动,激光场的净影响几乎为零,因此可以忽略唤醒场的贡献。最后,利用纵向自注入可以获得偏振为99%$的超短电子束。
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引用次数: 0
Generation of millijoule-level sub-5fs violet laser pulses 产生毫焦耳级亚 5fs 紫激光脉冲
IF 4.8 1区 物理与天体物理 Q1 OPTICS Pub Date : 2023-12-22 DOI: 10.1017/hpl.2023.100
Xinhua Xie, Yi Hung, Yunpei Deng, Adrian L. Cavalieri, A. Baltuška, Steven L. Johnson
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引用次数: 0
Distortions in focusing laser pulses due to spatio-temporal couplings–An analytic description 时空耦合导致的聚焦激光脉冲失真--分析描述
IF 4.8 1区 物理与天体物理 Q1 OPTICS Pub Date : 2023-12-18 DOI: 10.1017/hpl.2023.96
K. Steiniger, Fabia Dietrich, D. Albach, M. Bussmann, A. Irman, M. Loeser, R. Pausch, T. Püschel, Roland Sauerbrey, S. Schöbel, Ulrich Schramm, Mathias Siebold, K. Zeil, A. Debus
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引用次数: 0
High-repetition-rate and High-power Efficient Picosecond Thin-disk Regenerative Amplifier 高重复率和高功率高效皮秒薄盘再生放大器
IF 4.8 1区 物理与天体物理 Q1 OPTICS Pub Date : 2023-12-15 DOI: 10.1017/hpl.2023.97
Sizhi Xu, Yubo Gao, Xing Liu, Yewang Chen, D. Ouyang, Junqing Zhao, Minqiu Liu, Xu Wu, C. Guo, Cangtao Zhou, Qitao Lve, Shuangchen Ruan
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引用次数: 0
期刊
High Power Laser Science and Engineering
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