Contents
2020
Volume: 8 Issue 4
15 Article(s)

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Letters
Mid-infrared optical frequency comb in the 2.7–4.0 μm range via difference frequency generation from a compact laser system
Lian Zhou, Yang Liu, Gehui Xie, Chenglin Gu, Zejiang Deng, Zhiwei Zhu, Cheng Ouyang, Zhong Zuo, Daping Luo, Bin Wu, Kunfeng Chen, and Wenxue Li
We report on the generation of a mid-infrared (mid-IR) frequency comb with a maximum average output power of 250 mW and tunability in the 2.7–4.0 μm region. The approach is based on a single-stage difference frequency generation (DFG) starting from a compact Yb-doped fiber laser system. The repetition rate of the near-infrared (NIR) comb is locked at 75 MHz. The phase noise of the repetition rate in the offset-free mid-IR comb system is measured and analyzed. Except for the intrinsic of NIR comb, environmental noise at low frequency and quantum noise at high frequency from the amplifier chain and nonlinear spectral broadening are the main noise sources of broadening the linewidth of comb teeth, which limits the precision of mid-IR dual-comb spectroscopy.
High Power Laser Science and Engineering
  • Publication Date: Oct. 09, 2020
  • Vol.8 Issue, 4 04000e32 (2020)
Greater than 2 kW all-passive fiber Raman amplifier with good beam quality
Yizhu Chen, Tianfu Yao, Hu Xiao, Jinyong Leng, and Pu Zhou
We report a 2 kW all-fiberized Raman fiber amplifier with efficient brightness enhancement based on the graded-index fiber. The maximum power output reaches up to 2.034 kW centered at 1130 nm, with a conversion efficiency of 79.35% with respect to the injected pump power. To the best of our knowledge, this is the highest conversion efficiency obtained for any Raman laser system using graded-index fiber. An optimized fiber combiner adopting graded-index fiber as the pigtail fiber was fabricated, enabling the preservation of the seeding brightness in the core-pumped Raman fiber amplifier, and further enhancing the ultimate brightness of the output laser after amplification. At the maximum power output, the beam quality parameter M2 is 2.8, corresponding to a signal-to-pump brightness enhancement factor of 11.2. As far as we know, we obtain the highest brightness enhancement among Raman fiber lasers of over 100 W, and the best beam quality for graded-index Raman fiber lasers of over 150 W.
High Power Laser Science and Engineering
  • Publication Date: Oct. 09, 2020
  • Vol.8 Issue, 4 04000e33 (2020)
Research Articles
Ultra-broadband all-OPCPA petawatt facility fully based on LBO | Editors' Pick
Mario Galletti, Pedro Oliveira, Marco Galimberti, Munadi Ahmad, Giedre Archipovaite, Nicola Booth, Emerald Dilworth, Andy Frackiewicz, Trevor Winstone, Ian Musgrave, and Cristina Hernandez-Gomez
A petawatt facility fully based on noncollinear optical parametric chirped pulse amplification (NOPCPA) technology, Vulcan OPPEL (Vulcan OPCPA PEtawatt Laser), is presented. This system will be coupled with the existing hybrid-CPA/OPCPA VULCAN laser system (500 J, 500 fs beamline; 250 J, ns regime beamline) based on Nd:glass amplification. Its pulse duration (20 times shorter) combined with the system design will allow the auxiliary beamline and its secondary sources to be used as probe beams for longer pulses and their interactions with targets. The newly designed system will be mainly dedicated to electron beam generation, but could also be used to perform a variety of particle acceleration and optical radiation detection experimental campaigns. In this communication, we present the entire beamline design discussing the technology choices and the design supported by extensive simulations for each system section. Finally, we present experimental results and details of our commissioned NOPCPA picosecond front end, delivering 1.5 mJ, ~180 nm (1/e2) of bandwidth compressed to sub-15 fs.
High Power Laser Science and Engineering
  • Publication Date: Oct. 09, 2020
  • Vol.8 Issue, 4 04000e31 (2020)
Gamma-ray generation from ultraintense laser-irradiated solid targets with preplasma
Xiang-Bing Wang, Guang-Yue Hu, Zhi-Meng Zhang, Yu-Qiu Gu, Bin Zhao, Yang Zuo, and Jian Zheng
In the laser plasma interaction of quantum electrodynamics (QED)-dominated regime, γ-rays are generated due to synchrotron radiation from high-energy electrons traveling in a strong background electromagnetic field. With the aid of 2D particle-in-cell code including QED physics, we investigate the preplasma effect on the γ-ray generation during the interaction between an ultraintense laser pulse and solid targets. We found that with the increasing preplasma scale length, the γ-ray emission is enhanced significantly and finally reaches a steady state. Meanwhile, the γ-ray beam becomes collimated. This shows that, in some cases, the preplasmas will be piled up acting as a plasma mirror in the underdense preplasma region, where the γ-rays are produced by the collision between the forward electrons and the reflected laser fields from the piled plasma. The piled plasma plays the same role as the usual reflection mirror made from a solid target. Thus, a single solid target with proper scale length preplasma can serve as a manufactural and robust γ-ray source.
High Power Laser Science and Engineering
  • Publication Date: Oct. 16, 2020
  • Vol.8 Issue, 4 04000e34 (2020)
A Yb:KGW dual-crystal regenerative amplifier
Huijun He, Jun Yu, Wentao Zhu, Xiaoyang Guo, Cangtao Zhou, and Shuangchen Ruan
High Power Laser Science and Engineering
  • Publication Date: Oct. 27, 2020
  • Vol.8 Issue, 4 04000e35 (2020)
Potential damage threats to downstream optics caused by Gaussian mitigation pits on rear KDP surface
Hao Yang, Jian Cheng, Zhichao Liu, Qi Liu, Linjie Zhao, Chao Tan, Jian Wang, and Mingjun Chen
To determine whether a potassium dihydrogen phosphate (KDP) surface mitigated by micro-milling would potentially threaten downstream optics, we calculated the light-field modulation based on angular spectrum diffraction theory, and performed a laser damage test on downstream fused silica. The results showed that the downstream light intensification caused by a Gaussian mitigation pit of 800 μm width and 10 μm depth reached a peak value near the KDP rear surface, decreased sharply afterward, and eventually kept stable with the increase in downstream distance. The solved peak value of light intensification exceeded 6 in a range 8–19 mm downstream from the KDP rear surface, which is the most dangerous for downstream optics. Laser damage sites were then induced on the fused silica surface in subsequent laser damage tests. When the distance downstream was greater than 44 mm with a downstream light intensification of less than 3, there were no potential damage threats to downstream optics. The study proves that a mitigated KDP surface can cause laser damage to downstream optical components, to which attention should be paid in an actual application. Through this work, we find that the current manufacturing process and the mitigation index still need to be improved. The research methods and calculation models are also of great reference significance for related studies like optics mitigation and laser damage.
High Power Laser Science and Engineering
  • Publication Date: Nov. 23, 2020
  • Vol.8 Issue, 4 04000e37 (2020)
Asymmetric pulse effects on pair production in polarized electric fields
Obulkasim Olugh, Zi-Liang Li, and Bai-Song Xie
Using the Dirac–Heisenberg–Wigner formalism, effects of the asymmetric pulse shape on the generation of electron-positron pairs in three typical polarized fields, i.e., linear, middle elliptical and circular fields, are investigated. Two kinds of asymmetries for the falling pulse length, short and elongated, are studied. We find that the interference effect disappears with the shorter pulse length and that the peak value of the momentum spectrum is concentrated in the center of the momentum space. In the case of the extending falling pulse length, a multiring structure without interference appears in the momentum spectrum. Research results show that the momentum spectrum is very sensitive to the asymmetry of the pulse as well as to the polarization of the fields. We also find that the number density of electron-positron pairs under different polarizations is sensitive to the asymmetry of the electric field. For the short falling pulse, the number density can be significantly enhanced by over two orders of magnitude. These results could be useful in planning high-power and/or high-intensity laser experiments.
High Power Laser Science and Engineering
  • Publication Date: Nov. 23, 2020
  • Vol.8 Issue, 4 04000e38 (2020)
Single-frequency and free-running operation of a single-pass pulsed Ho:YLF amplifier
Yunpeng Wang, Youlun Ju, Tongyu Dai, Dong Yan, and Baoquan Yao
High Power Laser Science and Engineering
  • Publication Date: Nov. 23, 2020
  • Vol.8 Issue, 4 04000e39 (2020)
Photonic crystal rod-based high-performance ultrafast fiber laser system
Zhiguo Lv, Zhi Yang, Qianglong Li, Feng Li, Yishan Wang, Wei Zhao, and Xiaojun Yang
In this paper, we innovatively conduct a Porro prism-based beam pointing stability promotion technique research and realize a high-performance rod-type photonic crystal fiber-based chirped pulse amplification (CPA) system, mainly including a frequency-reduced all-fiber pre-amplification stage, photonic crystal rod-based main amplification stage, and 1600 lines/mm transmission grating-pair compressor. Laser output with average power of 50 W, repetition rates of 500 kHz, pulse energy of 100 μJ, pulse duration of 830 fs, beam quality of M2<1.3, power fluctuation of 0.55% root mean square, and beam pointing drift of 19 μrad/°C over 8 h is realized. The high-performance laser system has an enormous application potential in fundamental research and precision manufacturing fields.
High Power Laser Science and Engineering
  • Publication Date: Jan. 05, 2021
  • Vol.8 Issue, 4 04000e40 (2020)
Laser-induced damage thresholds of ultrathin targets and their constraint on laser contrast in laser-driven ion acceleration experiments
Dahui Wang, Yinren Shou, Pengjie Wang, Jianbo Liu, Zhusong Mei, Zhengxuan Cao, Jianmin Zhang, Pengling Yang, Guobin Feng, Shiyou Chen, Yanying Zhao, Joerg Schreiber, and Wenjun Ma
High Power Laser Science and Engineering
  • Publication Date: Jan. 05, 2021
  • Vol.8 Issue, 4 04000e41 (2020)
High-energy hybrid femtosecond laser system demonstrating 2 × 10 PW capability | On the Cover
François Lureau, Guillaume Matras, Olivier Chalus, Christophe Derycke, Thomas Morbieu, Christophe Radier, Olivier Casagrande, Sébastien Laux, Sandrine Ricaud, Gilles Rey, Alain Pellegrina, Caroline Richard, Laurent Boudjemaa, Christophe Simon-Boisson, Andrei Baleanu, Romeo Banici, Andrei Gradinariu, Constantin Caldararu, Bertrand De Boisdeffre, Petru Ghenuche, Andrei Naziru, Georgios Kolliopoulos, Liviu Neagu, Razvan Dabu, Ioan Dancus, and Daniel Ursescu
We report on a two-arm hybrid high-power laser system (HPLS) able to deliver 2 × 10 PW femtosecond pulses, developed at the Bucharest-Magurele Extreme Light Infrastructure Nuclear Physics (ELI-NP) Facility. A hybrid front-end (FE) based on a Ti:sapphire chirped pulse amplifier and a picosecond optical parametric chirped pulse amplifier based on beta barium borate (BBO) crystals, with a cross-polarized wave (XPW) filter in between, has been developed. It delivers 10 mJ laser pulses, at 10 Hz repetition rate, with more than 70 nm spectral bandwidth and high-intensity contrast, in the range of 1013:1. The high-energy Ti:sapphire amplifier stages of both arms were seeded from this common FE. The final high-energy amplifier, equipped with a 200 mm diameter Ti:sapphire crystal, has been pumped by six 100 J nanosecond frequency doubled Nd:glass lasers, at 1 pulse/min repetition rate. More than 300 J output pulse energy has been obtained by pumping with only 80% of the whole 600 J available pump energy. The compressor has a transmission efficiency of 74% and an output pulse duration of 22.7 fs was measured, thus demonstrating that the dual-arm HPLS has the capacity to generate 10 PW peak power femtosecond pulses. The reported results represent the cornerstone of the ELI-NP 2 × 10 PW femtosecond laser facility, devoted to fundamental and applied nuclear physics research.
High Power Laser Science and Engineering
  • Publication Date: Jan. 05, 2021
  • Vol.8 Issue, 4 04000e43 (2020)
Strong-field effects induced in the extreme ultraviolet domain
I. Makos, I. Orfanos, E. Skantzakis, I. Liontos, P. Tzallas, A. Forembski, L. A. A. Nikolopoulos, and D. Charalambidis
High Power Laser Science and Engineering
  • Publication Date: Jan. 05, 2021
  • Vol.8 Issue, 4 04000e44 (2020)
A novel cleanliness control method for disk amplifiers
Yangshuai Li, Bingyan Wang, Panzheng Zhang, Yanli Zhang, Yanfeng Zhang, Shenlei Zhou, Weixin Ma, and Jianqiang Zhu
As the key part for energy amplification of high-power laser systems, disk amplifiers must work in an extremely clean environment. Different from the traditional cleanliness control scheme of active intake and passive exhaust (AIPE), a new method of active exhaust and passive intake (AEPI) is proposed in this paper. Combined with computational fluid dynamics (CFD) technology, through the optimization design of the sizes, shapes, and locations of different outlets and inlets, the turbulence that is unfavorable to cleanliness control is effectively avoided in the disk amplifier cavity during the process of AEPI. Finally, the cleanliness control of the cavity of the disk amplifier can be realized just by once exhaust. Meanwhile, the micro negative pressure environment in the amplifier cavity produced during the exhaust process reduces the requirement for sealing. This method is simple, time saving, gas saving, efficient, and safe. It is also suitable for the cleanliness control of similar amplifiers.
High Power Laser Science and Engineering
  • Publication Date: Jan. 05, 2021
  • Vol.8 Issue, 4 04000e45 (2020)