High efficiency 125 J second-harmonic generation from CsLiB_6O_10 nonlinear crystal by diode-pumped Nd:glass laser

Sekine, Takashi; Sakai, Hiroshi; Yasuki, Tsuyoshi; Hatano, Y.; Kawashima, Toshiyuki; Kan, Hirofumi; Kawanaka, Junji; Miyanaga, Noriaki; Norimatsu, T.

doi:10.1364/oe.21.008393

Cited by 19 publications

(4 citation statements)

References 14 publications

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“…BEAT is a 10 Hz hybrid system via optical parametric chirped pulse amplification (OPCPA) and Ti:Al 2 O 3 multi-pass amplifiers [22,23]. KURE-1 is a second harmonic generation (SHG) 10 J/10 Hz DPSSL system based on a water-cooled Nd:glass zigzag path slab amplification scheme [24]. In KURE-1, a pulse through a nonlinear crystal (CsLiB 6 O 10 ) provides two beams: a converted SHG beam and the remainder fundamental beam.…”

Section: Tailored Hama Laser Systemmentioning

confidence: 99%

Fast heating of fuel assembled in a spherical deuterated polystyrene shell target by counter-irradiating tailored laser pulses delivered by a HAMA 1 Hz ICF driver

Mori

Nishimura²,

Hanayama

et al. 2017

Nucl. Fusion

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Fast heating is a method of heating an assembled high-density plasma into a hot state by irradiating it with short-duration (sub-picosecond), high-intensity ( W ) laser pulses before the plasma expands and dissolves hydrodynamically. In this paper, we present detailed experimental results of fast heating fuel assembled in a spherical deuterated polystyrene shell target of 500 m diameter and 7 μm thickness with counterbeam illumination by using a HAMA 1 Hz, 5.9 J inertial confinement fusion laser driver with pulse tailoring. These tailored pulses contain three pulses in sequence: a ‘foot’ pulse of 2.4 J/25 ns, a ‘spike’ pulse of 0.5 J/300 ps and a ‘heater’ pulse of 0.4 J/110 fs; these pulses are designed to assemble the fuel and heat it. By varying the energy of the foot pulse, we find that fast heating the fuel is achieved only if the fuel is weakly ablated by the foot pulse and then shock-assembled by the spike pulse into the target centre so that the heater pulse can access the fuel with a focal intensity greater than W . Without a foot pulse, the heater pulse contributes to assembling the fuel. For higher foot-pulse energies, the heater pulse drives a hydrodynamic motion with speeds of the order 107 cm with intensities of the order W , resulting in re-assembling and additional heating of the pre-assembled fuel. Once a shock-assembled core is achieved at the target centre, we succeed qualitatively in fast heating the core for shots in sequence with variations of laser energy within 18%. The coupling efficiency from the heating laser to the core is inferred to be % in total: % for the ionized bulk electrons and % for the bulk ions. The fusion neutron spectrum detected on the laser axis exhibits peaks at 1.0 MeV, 1.7 MeV and 3.8 MeV. These peaks are attributed to the N and He reactions induced by counterpropagating fast deuterons accelerated by the photon pressure of the heating pulses.

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Section: Tailored Hama Laser Systemmentioning

confidence: 99%

Fast heating of fuel assembled in a spherical deuterated polystyrene shell target by counter-irradiating tailored laser pulses delivered by a HAMA 1 Hz ICF driver

Mori

Nishimura²,

Hanayama

et al. 2017

Nucl. Fusion

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“…BEAT is a 10 Hz Ti : sapphire optical parametric chirped pulse amplification (OPCPA) system [7]. KURE-I is a green 10 J/10 Hz DPSSL system based on a watercooled Nd : glass zigzag path slab amplification scheme [8]. KURE-I pumps a Ti : sapphire crystal to amplify the seed beam from BEAT at a repetition of 1 Hz.…”

Section: Hama Laser Systemmentioning

confidence: 99%

“…A CLBO is used for frequency doubling from infrared at 1053 nm to green at 527 nm. This system is all-diode pumped and can operate at 10 J with a 10 Hz repetition rate [8]. The green pulse, with an aperture of 16 mm × 22 mm, is transported to the HAMA amplifier by a vacuum telescope with a length of 8 m.…”

Section: Pump Laser: Kure-imentioning

confidence: 99%

1 Hz fast-heating fusion driver HAMA pumped by a 10 J green diode-pumped solid-state laser

et al. 2013

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A Ti : sapphire laser HAMA pumped by a diode-pumped solid-state laser (DPSSL) is developed to enable a high-repetitive inertial confinement fusion (ICF) experiment to be conducted. To demonstrate a counter-irradiation fast-heating fusion scheme, a 3.8 J, 0.4 ns amplified chirped pulse is divided into four beams: two counter-irradiate a target with intensities of 6 × 1013 W cm−2, and the remaining two are pulse-compressed to 110 fs for heating the imploded target with intensities of 2 × 1017 W cm−2. HAMA contributed to the first demonstration by showing that a 10 J class DPSSL is adaptable to ICF experiments and succeeded in DD neutron generation in the repetition mode. Based on HAMA, we can design and develop an integrated repetitive ICF experiment machine by including target injection and tracking.

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“…Candidate pump sources are typically frequencydoubled 1-µm lasers based on neodymium or ytterbium in bulk hosts. Several demonstrations with Yb-doped crystals have achieved joule-class or greater frequency-doubled pulse energies [9][10][11]. Thermal management in these systems is of critical importance and typically limits the repetition rate to the ∼10 Hz range, although at least one system has been operated at 1 kHz through careful distribution of the thermal load over numerous amplification stages [12].…”

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confidence: 99%

Frequency-doubled Q-switched 4 × 4 multicore fiber laser system

et al. 2023

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Frequency doubling of a Q-switched Yb-doped rod-type 4 × 4 multicore fiber (MCF) laser system is reported. A second harmonic generation (SHG) efficiency of up to 52% was achieved with type I non-critically phase-matched lithium triborate (LBO), with a total SHG pulse energy of up to 17 mJ obtained at 1 kHz repetition rate. The dense parallel arrangement of amplifying cores into a shared pump cladding enables a significant increase in the energy capacity of active fibers. The frequency-doubled MCF architecture is compatible with high-repetition-rate and high-average-power operation and may provide an efficient alternative to bulk solid-state systems as pump sources for high-energy titanium-doped sapphire lasers.

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High efficiency 125 J second-harmonic generation from CsLiB_6O_10 nonlinear crystal by diode-pumped Nd:glass laser

Cited by 19 publications

References 14 publications

Fast heating of fuel assembled in a spherical deuterated polystyrene shell target by counter-irradiating tailored laser pulses delivered by a HAMA 1 Hz ICF driver

Fast heating of fuel assembled in a spherical deuterated polystyrene shell target by counter-irradiating tailored laser pulses delivered by a HAMA 1 Hz ICF driver

1 Hz fast-heating fusion driver HAMA pumped by a 10 J green diode-pumped solid-state laser

Frequency-doubled Q-switched 4 × 4 multicore fiber laser system

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