The LEKKO VIII CO&amp;lt;inf&amp;gt;2&amp;lt;/inf&amp;gt;gas laser system

Yamanaka, Chiyoe; Nakai, S.; Matoba, M.; Fujita, Hisanori; Kawamura, Yoshiyuki; Daido, Hiroyuki; Inoue, Masamichi; Fukumaru, F.; Terai, Kiyoshi

doi:10.1109/jqe.1981.1071312

Cited by 32 publications

(7 citation statements)

References 48 publications

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“…Construction of the Antares CO 2 laser facility at Los Alamos National Laboratory for an inertial confinement fusion project [14] (commissioned in 1984) and a similar but less energetic laser, LEKKO VIII, at the Institute of Laser Engineering of Osaka University [15] (commissioned in 1981) were probably the culmination of the first two decades of the development of CO 2 lasers. The Antares laser produced up to a total of 30 kJ of energy in 24 beams combined on the target.…”

Section: S and 1980s: First Stepsmentioning

confidence: 99%

High-Peak-Power Long-Wave Infrared Lasers with CO2 Amplifiers

et al. 2021

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Long-wave infrared (LWIR) picosecond pulses with multi-terawatt peak power have recently become available for advanced high-energy physics and material research. Multi-joule pulse energy is achieved in an LWIR laser system via amplification of a microjoule seed pulse with high-pressure, mixed-isotope CO2 amplifiers. A chirped-pulse amplification (CPA) scheme is employed in such a laser to reduce the nonlinear interaction between the optical field and the transmissive elements of the system. Presently, a research and development effort is underway towards an even higher LWIR peak power that is required, for instance, for promising particle acceleration schemes. The required boost of the peak power can be achieved by reducing the pulse duration to fractions of a picosecond. For this purpose, the possibility of reducing the gain narrowing in the laser amplifiers and post-compression techniques are being studied. Another direction in research is aimed at the increased throughput (i.e., repetition rate), efficiency, and reliability of LWIR laser systems. The transition from a traditional electric-discharge pumping to an optical pumping scheme for CO2 amplifiers is expected to improve the robustness of high-peak-power LWIR lasers, making them suitable for broad implementation in scientific laboratory, industrial, and clinical environments.

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Section: S and 1980s: First Stepsmentioning

confidence: 99%

High-Peak-Power Long-Wave Infrared Lasers with CO2 Amplifiers

et al. 2021

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“…Combining Eqs ( 10), ( 12) and ( 13), we have (15) is the diffusion time of the bulk magnetic field.…”

Section: Homentioning

confidence: 99%

Magnetically insulated and inertially confined fusion — MICF

Hasegawa¹,

Nishihara²,

Daido³

et al. 1988

Nucl. Fusion

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By combining the benefits of magnetic and inertial fusion, a new fusion scheme is proposed. A plasma with a density of ≳1021 cm−3 is confined by the inertia of a heavy, cannonball-type metallic shell; its heat is insulated by a self-generated magnetic field of ≳100 T. The plasma and the magnetic field are produced by ablation due to direct impact of a laser (or particle) beam on solid fuel which constitutes the coating of the inner surface of the spherical metallic shell. Preliminary experimental and simulation results, using a 100 J CO2 laser on a target of a few millimetre parylene shell, gave nτ ≅ 5 · 1012 cm−3·S, with T ≅ 500 eV. A 1-D spherical hydrodynamic code, HISHO, with the radial heat conductivity reduced by an assumed magnetic field of 103 T, leads to ignition at an absorbed energy of the order of 20 MJ deposited during a confinement time of approximately 100 ns. These results provide supporting evidence for the feasibility of the scheme as a realistic reactor.

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“…1. A double-line CO2 laser beam comes from the LEKKO VIII electron-beam-controlled laser system [9]. A cw oscillator injects a 9.569-pm line to the oscillator cavity.…”

mentioning

confidence: 99%