Publisher: Cambridge University Press   (Total: 386 journals)

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 High Power Laser Science and EngineeringJournal Prestige (SJR): 0.901 Citation Impact (citeScore): 3Number of Followers: 3     Open Access journal ISSN (Print) 2095-4719 - ISSN (Online) 2052-3289 Published by Cambridge University Press  [386 journals]
• Rapid growth of a long-seed KDP crystal

• Authors: Duanyang Chen; Bin Wang, Hu Wang, Xiangyu Zhu, Ziyuan Xu, Yuanan Zhao, Shenghao Wang, Kaizao Ni, Lili Zheng, Hui Zhang, Hongji Qi, Jianda Shao
Abstract: To reduce the seed length while maintaining the advantages of the cuboid KDP-type crystal, a long-seed KDP crystal with size $471~\text{mm}\times 480~\text{mm}\times 400~\text{mm}$ is rapidly grown. With almost the same high cutting efficiency to obtain third harmonic generation oriented samples, this long-seed KDP-type crystal can be grown with a shorter seed than that of the cuboid KDP-type crystal. The full width at half maximum of the high-resolution X-ray diffraction of the (200) crystalline face is 28.8 arc seconds, indicating that the long-seed KDP crystal has good crystalline quality. In the wavelength range of 377–1022 nm, the transmittance of the long-seed KDP crystal is higher than 90%. The fluence for the 50% probability of laser-induced damage (LID) is $18.5~\text{J}/\text{cm}^{2}$ (3 ns, 355 nm). Several test points survive when the laser fluence exceeds $30~\text{J}/\text{cm}^{2}$ (3 ns, 355 nm), indicating the good LID performance of the long-seed KDP crystal. At present, the growth of a long-seed DKDP crystal is under way.
PubDate: 2020-02-19T00:00:00.000Z
DOI: 10.1017/hpl.2019.54
Issue No: Vol. 8 (2020)

• Innovative education and training in high power laser plasmas (PowerLaPs)
for plasma physics, high power laser matter interactions and high energy
density physics: experimental diagnostics and simulations

• Authors: John Pasley; Georgia Andrianaki, Andreas Baroutsos, Dimitri Batani, Emmanouil P. Benis, Andrea Ciardi, Donna Cook, Vasilios Dimitriou, Brendan Dromey, Ioannis Fitilis, Giancarlo Gatti, Anastasios Grigoriadis, Marine Huault, Jose Antonio Pérez Hernández, Evaggelos Kaselouris, Ondrej Klimo, Michel Koenig, George Koundourakis, Milan Kucharik, Jiri Limpouch, Richard Liska, Carlos Salgado Lopez, Sophia Malko, Susana Olmos-Migueláñez, Yannis Orphanos, Valeria Ospina, Nektarios A. Papadogiannis, Stelios Petrakis, Jan Psikal, Maria Serena Rivetta, María-José Rodríguez-Conde, João Jorge Santos, Milan Sinor, Alexandros Skoulakis, Ioannis Tazes, Laura Tejada Pascual, Calliope Tsitou, Pavel Vachal, Luca Volpe, Jiri Vyskocil, Steven White, Mark Yeung, Ghassan Zerouli, Michael Tatarakis
Abstract: The second and final year of the Erasmus Plus programme ‘Innovative Education and Training in high power laser plasmas’, otherwise known as PowerLaPs, is described. The PowerLaPs programme employs an innovative paradigm in that it is a multi-centre programme, where teaching takes place in five separate institutes with a range of different aims and styles of delivery. The ‘in-class’ time is limited to 4 weeks a year, and the programme spans 2 years. PowerLaPs aims to train students from across Europe in theoretical, applied and laboratory skills relevant to the pursuit of research in laser plasma interaction physics and inertial confinement fusion. Lectures are intermingled with laboratory sessions and continuous assessment activities. The programme, which is led by workers from the Hellenic Mediterranean University and supported by co-workers from the Queen’s University Belfast, the University of Bordeaux, the Czech Technical University in Prague, Ecole Polytechnique, the University of Ioannina, the University of Salamanca and the University of York, has just finished its second and final year. Six Learning Teaching Training activities have been held at the Queen’s University Belfast, the University of Bordeaux, the Czech Technical University, the University of Salamanca and the Institute of Plasma Physics and Lasers of the Hellenic Mediterranean University. The last of these institutes hosted two 2-week-long Intensive Programmes, while the activities at the other four universities were each 5 days in length. In addition, a ‘Multiplier Event’ was held at the University of Ioannina, which will be briefly described. In this second year, the work has concentrated on training in both experimental diagnostics and simulation techniques appropriate to the study of plasma physics, high power laser matter interactions and high energy density physics. The nature of the programme will be described in detail, and some metrics relating to the activities carried out will be presented. In particular, this paper will focus on the overall assessment of the programme.
PubDate: 2020-02-18T00:00:00.000Z
DOI: 10.1017/hpl.2020.4
Issue No: Vol. 8 (2020)

• Generation and imaging of a tunable ultrafast intensity-rotating optical
field with a cycle down to femtosecond region

• Authors: Xuanke Zeng; Shuiqin Zheng, Yi Cai, Hongyu Wang, Xiaowei Lu, Honggeng Wang, Jingzhen Li, Weixin Xie, Shixiang Xu
Abstract: A tunable ultrafast intensity-rotating optical field is generated by overlapping a pair of 20 Hz, 800 nm chirped pulses with a Michelson interferometer (MI). Its rotating rate can be up to 10 trillion radians per second ( $\text{Trad}/\text{s}$ ), which can be flexibly tuned with a mirror in the MI. Besides, its fold rotational symmetry structure is also changeable by controlling the difference from the topological charges of the pulse pair. Experimentally, we have successfully developed a two-petal lattice with a tunable rotating speed from $3.9~\text{Trad}/\text{s}$ up to $11.9~\text{Trad}/\text{s}$ , which is confirmed by our single-shot ultrafast frame imager based on noncollinear optical-parametric amplification with its highest frame rate of 15 trillion frames per second (Tfps). This work is carried out at a low repetition rate. Therefore, it can be applied at relativistic, even ultrarelativistic, intensities, which usually operate in low repetition rate ultrashort and ultraintense laser systems. We believe that it may have application in laser-plasma-based accelerators, strong terahertz radiations and celestial phenomena.
PubDate: 2020-02-14T00:00:00.000Z
DOI: 10.1017/hpl.2020.1
Issue No: Vol. 8 (2020)

• ++++++++ ++++++++ ++++++++++++ ++++++++++++++++$1~\text{PW}/0.1~\text{Hz}$ ++++++++++++ ++++++++ +++++laser+beamline+in+SULF+facility&rft.title=High+Power+Laser+Science+and+Engineering&rft.issn=2095-4719&rft.date=2020&rft.volume=8&rft.aulast=Zhang&rft.aufirst=Zongxin&rft.au=Zongxin+Zhang&rft.au=Fenxiang+Wu,+Jiabing+Hu,+Xiaojun+Yang,+Jiayan+Gui,+Penghua+Ji,+Xingyan+Liu,+Cheng+Wang,+Yanqi+Liu,+Xiaoming+Lu,+Yi+Xu,+Yuxin+Leng,+Ruxin+Li,+Zhizhan+Xu&rft_id=info:doi/10.1017/hpl.2020.3">The $1~\text{PW}/0.1~\text{Hz}$ laser beamline in SULF facility

• Authors: Zongxin Zhang; Fenxiang Wu, Jiabing Hu, Xiaojun Yang, Jiayan Gui, Penghua Ji, Xingyan Liu, Cheng Wang, Yanqi Liu, Xiaoming Lu, Yi Xu, Yuxin Leng, Ruxin Li, Zhizhan Xu
Abstract: In this paper, we report the recent progress on the $1~\text{PW}/0.1~\text{Hz}$ laser beamline of Shanghai Superintense Ultrafast Laser Facility (SULF). The SULF-1 PW laser beamline is based on the double chirped pulse amplification (CPA) scheme, which can generate laser pulses of 50.8 J at 0.1 Hz after the final amplifier; the shot-to-shot energy fluctuation of the amplified pulse is as low as 1.2% (std). After compression, the pulse duration of 29.6 fs is achieved, which can support a maximal peak power of 1 PW. The contrast ratio at $-80~\text{ps}$ before main pulse is measured to be $2.5\times 10^{-11}$ . The focused peak intensity is improved by optimizing the angular dispersion in the grating compressor. The maximal focused peak intensity can reach $2.7\times 10^{19}~\text{W}/\text{cm}^{2}$ even with an $f/26.5$ off-axis parabolic mirror. The horizontal and vertical angular pointing fluctuations in 1 h are measured to be 1.89 and $2.45~\unicode[STIX]{x03BC}\text{rad}$ , respectively. The moderate repetition rate and the good stability are desirable characteristics for laser–matter interactions. The SULF-1 PW laser beamline is now in the phase of commissioning, and preliminary experiments of particle acceleration and secondary radiation under 300–400 TW/0.1 Hz laser condition have been implemented. The progress on the experiments and the daily stable operation of the laser demonstrate the availability of the SULF-1 PW beamline.
PubDate: 2020-02-14T00:00:00.000Z
DOI: 10.1017/hpl.2020.3
Issue No: Vol. 8 (2020)

• Transport of ultraintense laser-driven relativistic electrons in
dielectric targets

• Authors: X. H. Yang; C. Ren, H. Xu, Y. Y. Ma, F. Q. Shao
Abstract: Ultraintense laser-driven relativistic electrons provide a way of heating matter to high energy density states related to many applications. However, the transport of relativistic electrons in solid targets has not been understood well yet, especially in dielectric targets. We present the first detailed two-dimensional particle-in-cell simulations of relativistic electron transport in a silicon target by including the field ionization and collisional ionization processes. An ionization wave is found propagating in the insulator, with a velocity dependent on laser intensity and slower than the relativistic electron velocity. Widely spread electric fields in front of the sheath fields are observed due to the collective effect of free electrons and ions. The electric fields are much weaker than the threshold electric field of field ionization. Two-stream instability behind the ionization front arises for the cases with laser intensity greater than $5\times 10^{19}~\text{W}/\text{cm}^{2}$ that produce high relativistic electron current densities.
PubDate: 2020-02-13T00:00:00.000Z
DOI: 10.1017/hpl.2019.53
Issue No: Vol. 8 (2020)

• High-efficiency 50 W burst-mode hundred picosecond green laser

• Authors: Ning Ma; Meng Chen, Ce Yang, Shang Lu, Xie Zhang, Xinbiao Du
Abstract: We report high-energy, high-efficiency second harmonic generation in a near-infrared all-solid-state burst-mode picosecond laser at a repetition rate of 1 kHz with four pulses per burst using a type-I noncritical phase-matching lithium triborate crystal. The pulses in each burst have the same time delay ( ${\sim}1~\text{ns}$ ), the same pulse duration ( ${\sim}100~\text{ps}$ ) and different relative amplitudes that can be adjusted separately. A mode-locked beam from a semiconductor saturable absorber mirror is pulse-stretched, split into seed pulses and injected into a Nd:YAG regenerative amplifier. After the beam is reshaped by aspheric lenses, a two-stage master oscillator power amplifier and 4f imaging systems are applied to obtain a high power of ${\sim}100~\text{W}$ . The 532 nm green laser has a maximum conversion efficiency of 68%, an average power of up to 50 W and a beam quality factor $M^{2}$ of 3.5.
PubDate: 2020-01-31T00:00:00.000Z
DOI: 10.1017/hpl.2020.2
Issue No: Vol. 8 (2020)

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