1 State Key Laboratory of Nuclear Physics and Technology and Institute of Heavy Ion Physics, School of Physics, Peking University, Beijing 100871, China
2 Key Laboratory of Particle Acceleration Physics & Technology, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
3 Spallation Neutron Source Science Center, Dongguan 523803, Guangdong , China
In this paper we report a compact and robust regenerative amplifier developed as the pump laser for a high repetition rate terahertz parametric amplifier. With properly chosen pump source and carefully designed cavity, Nd∶YVO4 crystal, and laser beam collimator, a maximum output pulse energy of 480 μJ has been achieved at the repetition rate of 10 kHz. The output laser has a nearly Gaussian transverse profile and a narrow bandwidth of 0.2 nm. Long-term monitoring shows an root mean square power fluctuation of about 1%. These characteristics satisfy all requirements for high repetition rate terahertz parametric amplifier.
regenerative amplifier terahertz parametric amplifiers thermal lens 激光与光电子学进展
2022, 59(21): 2136001
强激光与粒子束
2022, 34(10): 104018
强激光与粒子束
2022, 34(10): 104011
强激光与粒子束
2022, 34(10): 104014
1 北京大学 核物理与核技术国家重点实验室,北京 100871
2 北京大学 物理学院 重离子物理研究所,北京 100871
3 中国科学院 高能物理研究所,北京 100049
4 德国电子同步加速器研究中心,德国 汉堡 22603
现代光源的发展不断推动着人们从更深层次上理解物质的基本结构和动力学行为。X射线自由电子激光作为最先进的光源,其超高的峰值功率、超短的脉冲长度和优良的相干性,为人们以原子级时空分辨率探测和操控物质中的超快过程提供了可能。目前全世界已有多个X射线自由电子激光装置建成并投入使用,在原子分子物理、化学、生命科学、材料科学等各学科应用中都显示出了重要价值。同时大量的研究工作也集中于继续提高X射线自由电子激光的性能,包括把脉冲持续时间从fs量级进一步缩短至as量级,这将为超快科学的发展带来新突破。以超快脉冲产生为主线,综述了近年来超快X射线自由电子激光产生方案的研究进展,从产生原理、方案特性、最新成果等方面介绍了各类产生方案,总结对比了各方案的优缺点,最后对超快X射线自由电子激光的未来发展方向进行了展望。
X射线 自由电子激光 超快光学 阿秒脉冲 X-ray free-electron laser ultrafast optics attosecond pulse 强激光与粒子束
2022, 34(5): 054001
Author Affiliations
Abstract
1 State Key Laboratory of Nuclear Physics and Technology and Institute of Heavy Ion Physics, School of Physics, Peking University, Beijing100871, China
2 Deutsches Elektronen-Synchrotron (DESY), 22603Hamburg, Germany
High-gain harmonic generation (HGHG) is effective to produce fully coherent free-electron laser (FEL) pulses for various scientific applications. Due to the limitation of seed lasers, HGHG typically operates at a low repetition rate. In this paper, a harmonic-enhanced HGHG scheme is proposed to relax the peak power requirement for the seed laser, which can therefore operate at megahertz and a higher repetition rate. Moreover, the setup of the scheme is compact and can be adopted in an existing single-stage HGHG facility to extend the shortest achievable wavelength. Simulations show that FEL emission at 13.5 nm (20th harmonic) can be obtained with a 270 nm, 1 MW (peak power) seed laser.
coherent radiation extreme ultraviolet free-electron laser high-gain harmonic generation high repetition rate High Power Laser Science and Engineering
2022, 10(1): 010000e4
1 中国科学院 高能物理研究所,北京 100049
2 中国科学院大学,北京 100049
3 华中科技大学 电气与电子工程学院,武汉 430074
4 南京大学 现代工程与应用科学学院,南京 210023
5 北京大学 重离子物理研究所&核物理与核技术国家重点实验室,北京 100871
6 中国科学院 上海高等研究院,上海 201204
7 散裂中子源科学中心,广东 东莞 523803
机器学习技术在近十几年发展迅猛,并被广泛地用于解决复杂的科学和工程问题。最近十年间,基于机器学习的粒子加速器相关研究也开始呈现出井喷式发展趋势。国际上许多加速器实验室开始尝试用机器学习和大数据技术处理加速器中的海量复杂数据,以期解决加速器及其子系统中的诸多物理和技术问题。不过,迄今为止,机器学习在加速器中的应用仍处于初步探索阶段,不同机器学习算法在解决具体加速器问题的效果及其适用范围尚待摸索,机器学习在实际加速器中的应用仍非常有限。因此,有必要对加速器领域中的机器学习研究做一个整体回顾和总结。将回顾机器学习在大型粒子加速器(以储存环加速器和直线加速器为主)中的加速器技术、束流物理以及加速器整体性能优化等研究方向中已取得的研究成果,并探讨机器学习在加速器领域的未来发展方向和应用前景。
机器学习 粒子加速器 大科学装置 大数据 加速器技术 束流物理 machine learning particle accelerator large scientific facilities big data accelerator technology beam physics 强激光与粒子束
2021, 33(9): 094001
Author Affiliations
Abstract
State Key Laboratory of Nuclear Physics and Technology and Institute of Heavy Ion Physics, School of Physics, Peking University, Beijing 100871, China
A high repetition rate, picosecond terahertz (THz) parametric amplifier with a LiNbO3 (LN) crystal has been demonstrated in this work. At a 10 kHz repetition rate, a peak power of 200 W and an average power of 12 μW have been obtained over a wide range of around 2 THz; at a 100 kHz repetition rate, a maximum peak power of 18 W and an average power of 10.8 μW have been obtained. The parametric gain of the LN crystal was also investigated, and a modified Schwarz–Maier model was introduced to interpret the experimental results.
far infrared or terahertz nonlinear optics parametric processes parametric oscillators and amplifiers Chinese Optics Letters
2020, 18(5): 051901
Author Affiliations
Abstract
Institute of Heavy Ion Physics, School of Physics, Peking University, Beijing, China
In order to improve the precision of the laser–radio-frequency (RF) synchronization system from sub-picosecond to femtosecond (fs), a synchronization system between a picosecond laser and a 1.3 GHz RF generator has been developed based on a fiber-loop optical-microwave phase detector (FLOM-PD). Synchronization with fs-level (3.8 fs) rms jitter, integrated from 10 Hz to 1 MHz, is achieved for the first time, to the best of our knowledge, in this kind of configuration. This system will be used for the superconducting RF accelerator at Peking University.
060.5625 Radio frequency photonics 320.7090 Ultrafast lasers 350.4010 Microwaves Chinese Optics Letters
2018, 16(1): 010607