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High gain preamplifier module (PAM) engineering prototype for the National Ignition Facility (NIF) laser system

Description: We describe recent results and developments in the preamplifier module (PAM) engineering prototype located in NIF� s front end or Optical Pulse Generation (OPG) system. This prototype uses the general laser design developed on a physics testbed and integrates NIP type packaging as well as controls and diagnostics. We will present laser, mechanical and electrical hardware designed and built to date as well as laser energetics measurements.
Date: October 29, 1998
Creator: Braucht, J; Browning, D; Crane, J K; Crawford, J; Deadrick, F J; Hawkins, S et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Diffraction-limited, high average power phase-locking of four 30J beams from discrete Nd:glass zig-zag amplifiers

Description: A single ND:YLF oscillator beam is amplified in four discrete Nd:glass, flashiamp-pumped, zig-zag amplifiers. The resulting four 30J beams are phase- locked using SBS phase conjugation, resulting in near diffraction-limited 120J pulses from a single aperture at up to a 1 OHz pulse repetition frequency.
Date: April 24, 1997
Creator: Dane, C. B.; Wintemute, J. D.; Bhachu, B. & Hackel, L. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Status of the National Ignition Facility project

Description: The ultimate goal of worldwide research in inertial confinement fusion (ICF) is to develop fusion as an inexhaustible, economic, environmentally safe source of electric power. Following nearly thirty years of laboratory and underground fusion experiments, the next step toward this goal is to demonstrate ignition and propagating burn of fusion fuel in the laboratory. The National Ignition Facility(NIF) Project is being constructed at Lawrence Livermore National Laboratory (LLNL), for just this p… more
Date: April 1, 1997
Creator: Paisner, J.A.; Lowdermilk, W.H.; Boyes, J.D.; Sorem, M.S. & Soures, J.M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Observation of stimulated raman scattering in an optical fiber at the Fermilab A0 photoinjector

Description: We have observed stimulated Raman scattering in a 2 km long optical fiber injected with an 81 MHz train of {approximately}80 ps pulses from a modelocked Nd:YLF oscillator operating at {lambda} = 1054 nm.
Date: September 1, 1998
Creator: Fry, A. R.; Taylor, B.; Fitch, M. J. & Melissinos, A. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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250 watt average power electro-quality Q-switched diode pumped power oscillator

Description: We describe an electro-optically Q-switched, diode-pumped ND:YAG slab laser oscillator operating at an average power of greater than 250 watts. More than 100 watts of frequency doubled light has been demonstrated.
Date: April 1, 1994
Creator: Velsko, S. P.; Ebbers, C. A.; Comaskey, B.; Albrecht, G. F. & Mitchell, S. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Trident as an ultrahigh irradiance laser

Description: The Trident Nd:glass ICF laser at Los Alamos may be operated in a mode that produces high ultrashort pulses by the chirp/compression method. The 125-ps pulses from a standard moderated, ND:YLF oscillator are first frequency-broadened to 3-nm bandwidth, chirped in a quartz fiber, and then compressed with a grating pair to 1.5 ps. A second quartz fiber then provides nonlinear polarization rotation for background and satellite suppression and to further broaden the spectrum to >7 nm. Pulses are ch… more
Date: February 1, 1995
Creator: Johnson, R. P.; Moncur, N. K.; Cobble, J. A.; Watt, R. G. & Gibson, R. B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Optically induced surface flashover switching for the dielectric wall accelerator

Description: Fast, low jitter command triggered switching is key to the successful implementation of the dielectric wall accelerator (DWA). We are studying a UV induced vacuum surface flashover switch for this purpose. We present our initial data using a Nd:YAG laser incident onto a high gradient insulator surface at 1{omega}, 2{omega}, and 4{omega}. Best 1{sigma} jitter was <1 ns with no degradation of the switch after 500 shots.
Date: April 27, 1995
Creator: Sampayan, S.; Caporaso, G.; Carder, B.; Norton, M.; Trimble, D. & Elizondo, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Thermal analysis of the large close packed amplifiers in the National Ignition Facility (NIF)

Description: Flashlamp pumping of the large aperture multi-segment NIF amplifiers will result in large amounts of energy being deposited as heat in the amplifier components. The magnitude of the heating and the nonuniform distribution result in a delay time between shots due to wavefront distortion and steering error. A NEF requirement is that the thermal wavefront recovery must occur in less than six hours. The principal cause of long-term wavefront distortion is the thermal gradient produced in the slab a… more
Date: May 1, 1995
Creator: Brown, D. L. & Mannell, G. T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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High-average-power diode-end-pumped intracavity-doubled Nd:YAG laser

Description: A compact diode-pumped ND:YAG laser was frequency-doubled to 0.532 {mu}m with an intracavity KTP or LBO crystal using a `V` cavity configuration. Two acousto-optic Q-switches were employed at repetition rates of 10-30 kHz. Dichroic fold and end mirrors were used to output two beams with up to 140 W of 0.532 {mu}m power using KTP and 116 W using LBO as the frequency doubling crystal. This corresponds to 66% of the maximum output power at 1.064 {mu}m obtained with an optimized output coupler refl… more
Date: February 12, 1998
Creator: Honea, E. C.; Ebbers, C. A.; Beach, R. J.; Speth, J. A.; Emanuel, M. S.; Skidmore, J. A. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Spatial filter lens design for the main laser of the National Ignition Facility

Description: The National Ignition Facility 0, being designed and constructed at Lawrence Livermore National Laboratory (LLNL), comprises 192 laser beams. The lasing medium is neodymium in phosphate glass with a fundamental frequency (Ice) of 1.053~. Sum frequency generation in a pair of conversion crystals (KDP/KD*P) will produce 1.8 megajoules of the third harmonic light (30 or bO.351~) at the target. The purpose of this paper is to provide the lens design community with the current lens design details of… more
Date: June 26, 1998
Creator: English, R E; Korniski, R J & Miller, J L
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Development of a micropump for microelectronic cooling

Description: To demonstrate a system integration process for Micro-Electro-Mechanical Systems (MEMS), we are building an active cooling MEMS unit for microelectronics applications. This integrated unit will incorporate a micropump, temperature sensors, microchannels, and heat exchange devices into a single unit. The first phase of this research project is to develop and test a micropump capable of moving the working fluid within the integrated device. This paper will discuss the design, development, testing… more
Date: October 1, 1996
Creator: Wong, C. C.; Adkins, D. R. & Chu, Dahwey
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Laser assisted non-consumable arc welding process development

Description: The employment of Laser Beam Welding (LBW) for many traditional arc welding applications is often limited by the inability of LBW to compensate for variations in the weld joint gap. This limitation is associated with fluctuations in the energy transfer efficiency along the weld joint. Since coupling of the laser beam to the workpiece is dependent on the maintenance of a stable absorption keyhole, perturbations to the weld pool can lead to decreased energy transfer and resultant weld defects. Be… more
Date: September 1, 1997
Creator: Fuerschbach, Phillip W. & Hooper, Frederick M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Design and performance of the main amplifier system for the National Ignition Facility

Description: This paper describes the design and performance of flashlamp-pumped, Nd:glass. Brewster-angle slab amplifiers intended to be deployed in the National Ignition Facility (NIF). To verify performance, we tested a full-size, three-slab-long, NIF prototype amplifier, which we believe to be the largest flashlamp-pumped Nd:glass amplifier ever assembled. Like the NIF amplifier design, this prototype amplifier had eight 40-cm-square apertures combined in a four-aperture-high by two-aperture-wide matrix… more
Date: February 16, 1999
Creator: Beullier, J; Erlandson, A; Grebot, E; Guenet, J; Guenet, M; Horvath, J et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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High-Throughput Laser Peening of Metals Using a High-Average-Power Nd: Glass Laser System

Description: Laser shot peening, a surface treatment for metals, is known to induce residual compressive stresses to depths of over 1 mm providing improved component resistance to various forms of failure. Recent information also suggests that thermal relaxation of the laser induced stress is significantly less than that experienced by other forms of surface stressing that involve significantly higher levels of cold work. We have developed a unique solid state laser technology employing Nd:glass amplifier s… more
Date: November 1, 1999
Creator: Dane, C. B.; Hackel, L. A.; Halpin, J.; Daly, J.; Harrisson, J. & Harris, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A diode-pumped channel waveguide laser fabricated in Nd: phosphate glass

Description: We report on the laser performance of a Nd:phosphate glass (Nd:IOG-1) channel waveguide laser fabricated by electric field assisted Ag{sup +} diffusion. Lasing was achieved in two different size channels, 29 x 9 {micro}m{sup 2} and 50 x 9 {micro}m{sup 2}, on a sample of length 8 mm. Slope efficiencies of {approximately} 15% with respect to incident pump power were measured. Losses in the 29 um wide channel were measured to be in the range 0.2--1.1 dB/cm and in the 50 mm channel, 0.2--0.4 dB/cm.… more
Date: January 29, 1999
Creator: Patel, F. D.; Honea, E. C.; Krol, D.; Payne, S. A. & Hayden, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Laser engineered net shaping (LENS) for the fabrication of metallic components

Description: Solid free form fabrication is a fast growing automated manufacturing technology that has reduced the time between initial concept and fabrication. Starting with CAD renditions of new components, techniques such as stereolithography and selective laser sintering are being used to fabricate highly accurate complex 3-D objects using polymers. Together with investment casting, sacrificial polymeric objects are used to minimize cost and time to fabricate tooling used to make complex metal casting. … more
Date: June 1, 1996
Creator: Griffith, M. L.; Keicher, D. L.; Romero, J. A.; Atwood, C. L.; Harwell, L. D.; Greene, D. L. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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>100 watt average power at 0.53 {mu}m with 25 ns, 2.5 kHz repetition rate pulses from a single power oscillator

Description: We have generated approximately 100 watts of frequency doubled light from the output of an electro-optically Q-switched, diode-pumped Nd:YAG slab laser oscillator operating at an average power of 200 watts (2.5 kHz repetition rate, 80 mJ/pulse, 25 ns pulsewidth). The Q-switch was a compensated z-axis propagation LiNbO{sub 3} electro-optic modulator, and the frequency conversion crystal was a thin slab of KTP. In addition, Q-switched operation at an average power of approximately 250 watts with … more
Date: March 1, 1994
Creator: Velsko, S. P.; Comaskey, B.; Albrecht, G. F. & Beach, R. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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