John K. Crane
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View article: Application of Yb:YAG short pulse laser system
Application of Yb:YAG short pulse laser system Open
A diode pumped, high power (at least 20W), short pulse (up to 2 ps), chirped pulse amplified laser using Yb:YAG as the gain material is employed for material processing. Yb:YAG is used as the gain medium for both a regenerative amplifier a…
View article: Development of a bright MeV photon source with compound parabolic concentrator targets on the National Ignition Facility Advanced Radiographic Capability (NIF-ARC) laser
Development of a bright MeV photon source with compound parabolic concentrator targets on the National Ignition Facility Advanced Radiographic Capability (NIF-ARC) laser Open
Compound parabolic concentrator (CPC) targets are utilized at the National Ignition Facility Advanced Radiographic Capability (NIF-ARC) laser to enhance the acceleration of electrons and production of high energy photons, for laser duratio…
View article: 10-kJ Status and 100-kJ Future for NIF PetaWatt Technology
10-kJ Status and 100-kJ Future for NIF PetaWatt Technology Open
We discuss the status of the NIF ARC, an 8-beam 10-kJ class high-energy petawatt laser, and the future upgrade path of this and similar systems to 100-kJ-class with coherent phasing of multiple apertures.
View article: Scaling to Ultra-High Intensities by High-Energy Petawatt Beam Combining
Scaling to Ultra-High Intensities by High-Energy Petawatt Beam Combining Open
The output pulse energy from a single-aperture high-energy laser amplifier (e.g. fusion lasers such as NIF and LMJ) are critically limited by a number of factors including optical damage, which places an upper bound on the operating fluenc…
View article: Short-pulse Laser Capability on the Mercury Laser System
Short-pulse Laser Capability on the Mercury Laser System Open
Applications using high energy ''petawatt-class'' laser drivers operating at repetition rates beyond 0.01 Hz are only now being envisioned. The Mercury laser system is designed to operate at 100 J/pulse at 10 Hz. We investigate the potenti…
View article: A dual high-energy radiography platform with 15 <i>μ</i>m resolution at the National Ignition Facility
A dual high-energy radiography platform with 15 <i>μ</i>m resolution at the National Ignition Facility Open
To study matter at extreme densities and pressures, we need mega laser facilities such as the National Ignition Facility as well as creative methods to make observations during timescales of a billionth of a second. To facilitate this, we …
View article: Spatio-temporal focal spot characterization and modeling of the NIF ARC kilojoule picosecond laser
Spatio-temporal focal spot characterization and modeling of the NIF ARC kilojoule picosecond laser Open
The advanced radiographic capability (ARC) laser system, part of the National Ignition Facility (NIF) at Lawrence Livermore National Laboratory, is a short-pulse laser capability integrated into the NIF. The ARC is designed to provide adju…
View article: Injection laser system for Advanced Radiographic Capability using chirped pulse amplification on the National Ignition Facility
Injection laser system for Advanced Radiographic Capability using chirped pulse amplification on the National Ignition Facility Open
We report on the design, performance, and qualification of the injection laser system designed to deliver joule-level chirped pulse beamlets arranged in dual rectangular beam formats into two main laser amplifier beamlines of the National …
View article: Laser Materials Processing Final Report CRADA No. TC-1526-98
Laser Materials Processing Final Report CRADA No. TC-1526-98 Open
This CRADA project was a joint effort between Lawrence Livermore National Laboratory (LLNL) and United Technologies Corporation (UTC)/Pratt & Whitney (P&W) to demonstrate process capability for drilling holes in turbine airfoils using LLNL…
View article: High-energy (&gt;70 keV) x-ray conversion efficiency measurement on the ARC laser at the National Ignition Facility
High-energy (>70 keV) x-ray conversion efficiency measurement on the ARC laser at the National Ignition Facility Open
The Advanced Radiographic Capability (ARC) laser system at the National Ignition Facility (NIF) is designed to ultimately provide eight beamlets with a pulse duration adjustable from 1 to 30 ps, and energies up to 1.5 kJ per beamlet. Curre…
View article: Performance measurements on NIF beamlines for future experiments to support polar direct drive
Performance measurements on NIF beamlines for future experiments to support polar direct drive Open
We are studying the implementation of polar direct drive (PDD) ignition experiments on the National Ignition Facility (NIF) laser system. Part of this preparation involves testing the performance of the NIF laser system over a broader span…