Characterization of the plasma mirror system at the J-KAREN-P facility

Kon, Akira; Nishiuchi, Mamiko; Fukuda, Yuji; Kondo, Kotaro; Sagisaka, A.; Miyasaka, Yasuhiro; Dover, N. P.; Kobayashi, Masaki; Pirozhkov, Alexander S.; Daito, I.; Chang, Liu; Choi, Il Woo; Nam, Chang Hee; Ziegler, Tim; Schlenvoigt, Hans-Peter; Zeil, Karl; Schramm, U.; Kiriyama, Hiromitsu

doi:10.1017/hpl.2022.15

Cited by 7 publications

(4 citation statements)

References 69 publications

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“…Figures 1 and 2 show the schematic diagram of the J-KAREN-P laser system, and the view of the J-KAREN-P laser [28,29] and target chambers [30], respectively. The system consists of two CPA stages.…”

Section: Overall J-karen-p Laser System Architecture and Output Perfo...mentioning

confidence: 99%

“…As shown in Figure 12a, a single plasma mirror configuration can improve contrast by three orders of magnitude [30]. However, the current temporal contrast measurement system was limited to approximately 12 orders of magnitude and actual measurements are not possible.…”

Section: Residual Pre-pulsesmentioning

confidence: 99%

“…In Germany, approximately 11-12 orders of magnitude contrast at tens of picoseconds in DRACO-1PW facility using single plasma mirror was also reported. In Korea, in the 4 PW facility, approximately 17 orders of magnitude contrast using double plasma mirror was achieved [30].…”

Section: Residual Pre-pulsesmentioning

confidence: 99%

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Laser Output Performance and Temporal Quality Enhancement at the J-KAREN-P Petawatt Laser Facility

Kiriyama,

Miyasaka,

Kon

et al. 2023

Photonics

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We described the output performance and temporal quality enhancement of the J-KAREN-P petawatt laser facility. After wavefront correction using a deformable mirror, focusing with an f/1.3 off-axis parabolic mirror delivered a peak intensity of 1022 W/cm2 at 0.3 PW power levels. Technologies to improve the temporal contrast were investigated and tested. The origins of pre-pulses generated by post-pulses were identified and the elimination of most pre-pulses by removal of the post-pulses with wedged optics was achieved. A cascaded femtosecond optical parametric amplifier based on the utilization of the idler pulse rather than the signal pulse was developed for the complete elimination of the remaining pre-pulses. The orders of magnitude enhancement of the pedestal before the main pulse were obtained by using a higher surface quality of the convex mirror in the Öffner stretcher. A single plasma mirror was installed in the J-KAREN-P laser beam line for further contrast improvement of three orders of magnitude. The above developments indicate, although it has not been directly measured, the contrast can be as high as approximately 1015 up to 40 ps before the main pulse. We also showed an overview of the digital transformation (DX) of the system, enabling remote and automated operation of the J-KAREN-P laser facility.

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Section: Overall J-karen-p Laser System Architecture and Output Perfo...mentioning

confidence: 99%

Section: Residual Pre-pulsesmentioning

confidence: 99%

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Laser Output Performance and Temporal Quality Enhancement at the J-KAREN-P Petawatt Laser Facility

Kiriyama,

Miyasaka,

Kon

et al. 2023

Photonics

Self Cite

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“…Nowadays, PW-and 10 PW-level femtosecond lasers based on the Ti:sa CPA technique have been built and operated worldwide, and the corresponding focused peak intensities have reached 10 22 and even 10 23 W/cm 2 [8][9][10][11][12][13][14][15]. Such superintense lasers can create extreme conditions and provide unprecedented means for high-field sciences [16][17][18][19][20][21]. On the other hand, the OPCPA technique also has wide application prospects due to its outstanding advantages, such as high single-pass gain, low thermal loading, broad bandwidth, and wavelength tunability [22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

A Promising Route to Compact and Economic Sub-15 fs, PW-Level Ti:Sapphire Lasers

Wu,

Hu,

Zhang

et al. 2024

Photonics

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In quest of achieving compact and economic PW-level Ti:Sapphire (Ti:sa) lasers with a sub-15 fs pulse duration, a modified hybrid amplification scheme, which combines the optical parametric chirped pulse amplifier (OPCPA) and the chirped pulse amplifier (CPA), is presented and numerically investigated in this paper. The key characteristic of this scheme is that the conventional Ti:sa regenerative amplifier and preamplifier are replaced by a dual-crystal OPCPA front-end, which is spectrally matched with the upstream seed source and the downstream Ti:sa amplifiers and, therefore, can realize a broader spectrum. Moreover, some useful laser techniques are also applied to suppress the spectral gain narrowing and redshift in the Ti:sa CPA chain and to control the residual dispersion in the laser system. This way, fewer amplification stages and pump lasers are required to reach PW-level peak power compared with traditional all-CPA Ti:sa lasers. Numerical results indicate that pulse energy and spectral bandwidth can reach up to ∼22 J and ∼125 nm at full width at half maximum (FWHM), respectively, only by employing three-stage amplifiers. After compression, PW-level lasers with a ∼13.3 fs pulse duration are expected. This work can offer a promising route for the development of compact and economic PW-level Ti:sa lasers.

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Optimization of laser-driven quantum beam generation and the applications with artificial intelligence

Kuramitsu,

Taguchi,

Nikaido

et al. 2024

Physics of Plasmas

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We have investigated space and astrophysical phenomena in nonrelativistic laboratory plasmas with long high-power lasers, such as collisionless shocks and magnetic reconnections, and have been exploring relativistic regimes with intense short pulse lasers, such as energetic ion acceleration using large-area suspended graphene. Increasing the intensity and repetition rate of the intense lasers, we have to handle large amounts of data from the experiments as well as the control parameters of laser beamlines. Artificial intelligence (AI) such as machine learning and neural networks may play essential roles in optimizing the laser and target conditions for efficient laser ion acceleration. Implementing AI into the laser system in mind, as the first step, we are introducing machine learning in ion etch pit analyses detected on plastic nuclear track detectors. Convolutional neural networks allow us to analyze big ion etch pit data with high precision and recall. We introduce one of the applications of laser-driven ion beams using AI to reconstruct vector electric and magnetic fields in laser-produced turbulent plasmas in three dimensions.

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Characterization of the plasma mirror system at the J-KAREN-P facility

Cited by 7 publications

References 69 publications

Laser Output Performance and Temporal Quality Enhancement at the J-KAREN-P Petawatt Laser Facility

Laser Output Performance and Temporal Quality Enhancement at the J-KAREN-P Petawatt Laser Facility

A Promising Route to Compact and Economic Sub-15 fs, PW-Level Ti:Sapphire Lasers

Optimization of laser-driven quantum beam generation and the applications with artificial intelligence

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