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Drilling with fiber-transmitted, visible lasers

Description: High power and radiance copper-vapor laser technology developed at Lawrence Livermore National Laboratory shows great promise for many materials processing tasks. The authors recently transmitted the visible light produced by these lasers through fiber optics to perform hole drilling experiments. They found the tolerances on the hole circulatory and cylindricity to be excellent when compared to that produced by conventional optics. This technique lends itself to many applications that are diffi… more
Date: February 17, 1994
Creator: Kautz, D. D.; Berzins, L. V.; Dragon, E. P.; Werve, M. E. & Warner, B. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Laser drilling of vertical vias in silicon

Description: Any advance beyond the density of standard 2D Multichip Modules (MCM) will require a vertical interconnect technology that can produce reliable area array interconnection with small feature sizes. Laser drilled vertical vias have been controllably produced in standard silicon (Si) wafers down to 0.035mm (0.0014 inches) in diameter. Several laser systems and their system parameters have been explored to determine the optimum parametric set for repeatable vias in Si. The vias produced have exhibi… more
Date: August 1, 1993
Creator: Miller, W. D.; Gassman, R. A. & Keicher, D. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Cutting and drilling studies using high power visible lasers

Description: High power and radiance laser technologies developed at Lawrence Livermore National Laboratory such as copper-vapor and dye lasers show great promise for material processing tasks. Evaluation of models suggests significant increases in welding, cutting, and drilling capabilities, as well as applications in emerging technologies such as micromachining, surface treatment, and stereolithography. Copper lasers currently operate at 1.8 kW output at approximately three times the diffraction limit and… more
Date: May 27, 1993
Creator: Kautz, D. D.; Dragon, E. P.; Werve, M. E.; Hargrove, R. S. & Warner, B. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Laser materials processing applications at Lawrence Livermore National Laboratory

Description: High power and high radiance laser technologies developed at Lawrence Livermore National Laboratory (LLNL) such as copper-vapor lasers, solid-state slab lasers, dye lasers, harmonic wavelength conversion of these lasers, and fiber optic delivery systems show great promise for material processing tasks. Evaluation of models suggests significant potential for tenfold increases in welding, cutting, and drilling performance, as well as capability for applications in emerging technologies such as mi… more
Date: February 25, 1993
Creator: Hargrove, R. S.; Dragon, E. P.; Hackel, R. P.; Kautz, D. D. & Warner, B. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Rapid prototyping of a micro pump with laser micromaching

Description: A micro electrohydrodynamic (EHD) injection pump has been developed using laser micromaching technology. Two designs have been fabricated, tested, and evaluated. The first design has two silicon pieces with KOH-etched wells which are stacked on the top of each other. The wells am etched on one side of the wafer and gold is deposited on the other side to serve as the pump electrodes. A ND:YAG laser is used to drill an array holes in the well region of both silicon die. This creates a grid distri… more
Date: August 1, 1995
Creator: Wong, C. C.; Chu, D.; Liu, S. L.; Tuck, M. R.; Mahmud, Z. & Amatucci, V.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Manufacturing technology

Description: The mission of the Manufacturing Technology thrust area at Lawrence Livermore National Laboratory (LLNL) has been to have an adequate base of manufacturing technology, not necessarily resident at LLNL, to conduct their future business. The specific goals were (1) to develop an understanding of fundamental fabrication processes; (2) to construct general purpose process models that have wide applicability; (3) to document their findings and models in journals; (4) to transfer technology to LLNL p… more
Date: January 1, 1998
Creator: Blaedel, Kenneth L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

New applications of copper vapor lasers in micromachining

Description: We have developed a copper vapor laser based micromachinig system using advanced beam quality control and precision wavefront tilting technologies. Precision microdrilling has been demonstrated through percussion drilling and trepanning using this system. With a 30-W copper vapor from running at multi-kHz pulse repetition frequency, straight parallel holes with size varying from 500 microns to less than 25 microns and with aspect ratio up to 1:40 have been consistently drilled with good surface… more
Date: November 9, 1994
Creator: Chang, J. J.; Martinez, M. W.; Warner, B. E.; Dragon, E. P.; Huete, G. & Solarski, M. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Computational electronics and electromagnetics

Description: The Computational Electronics and Electromagnetics thrust area at Lawrence Livermore National Laboratory serves as the focal point for engineering R&D activities for developing computer-based design, analysis, and tools for theory. Key representative applications include design of particle accelerator cells and beamline components; engineering analysis and design of high-power components, photonics, and optoelectronics circuit design; EMI susceptibility analysis; and antenna synthesis. The FY-9… more
Date: February 1, 1997
Creator: Shang, C. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Development of Advanced Photolytic Iodine Laser (PIL) Cutting and Joining Technologies for Manufacturing

Description: An evaluation was made of the Photolytic Iodine Laser (PIL) being developed by Advanced Optical Equipment and Services Corporation for metalworking applications. This laser operates in the infrared region of the spectrum and was anticipated to have a very small focal spot size and very low divergence. With these properties, it would be very effective at making small welds and narrow slots in metals. The program was of limited success due to low power output from the laser as well as power and p… more
Date: September 1, 1998
Creator: Mustaleski, T. & Richey, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Thin-film amorphous silicon alloy research partnership. Phase 2, Annual technical progress report, 2 February 1996--1 February 1997

Description: This is Phase II of a 3-phase, 3-year program. It is intended to expand, enhance, and accelerate knowledge and capabilities for developing high-performance, two-terminal multijunction amorphous Si alloy modules. We discuss investigations on back reflectors to improve cell performance and investigate uniformity in performance over a 1-sq.-ft. area. We present results on component cell performance, both in the initial and in the light-degraded states, deposited over a 1-sq.-ft. area. The uniformi… more
Date: June 1, 1997
Creator: Guha, S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Femtosecond laser materials processing

Description: The use femtosecond pulses for materials processing results in very precise cutting and drilling with high efficiency. Energy deposited in the electrons is not coupled into the bulk during the pulse, resulting in negligible shock or thermal loading to adjacent areas.
Date: February 1, 1997
Creator: Stuart, B. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Advanced packaging technology for high frequency photonic applications

Description: An advanced packaging concept has been developed for optical devices. This concept allows multiple fibers to be coupled to photonic integrated circuits, with no fiber penetration of the package walls. The principles used to accomplish this concept involves a second-order grating to couple light in or out of the photonic circuit, and a binary optic lens which receives this light and focuses it into a single-mode optical fiber. Design, fabrication and electrical/optical measurements of this packa… more
Date: March 1, 1996
Creator: Armendariz, M. G.; Hadley, G. R. & Warren, M. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Computational modeling of ultra-short-pulse ablation of enamel

Description: A computational model for the ablation of tooth enamel by ultra-short laser pulses is presented. The role of simulations using this model in designing and understanding laser drilling systems is discussed. Pulses of duration 300 sec and intensity greater than 10{sup 12} W/cm{sup 2} are considered. Laser absorption proceeds via multi-photon initiated plasma mechanism. The hydrodynamic response is calculated with a finite difference method, using an equation of state constructed from thermodynami… more
Date: February 29, 1996
Creator: London, R. A.; Bailey, D. S. & Young, D. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Laser processing analysis and research: tracking code 94-ERP-071. Final report

Description: This Exploratory Research Project addressed the coupling between short pulse, short wave length, high-radiance laser beams and a solid substrate. The motivation for conducting this research stems from the ever increasing application of high-radiance lasers in processing materials for science and industry. As a result of extensive research and development activities at Lawrence Livermore National Laboratory, there are now several lasers that can cut metals, ceramics, and composites rapidly with … more
Date: March 1, 1996
Creator: Chang, J. J.; Boley, C. D. & Ault, E. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Precision micro drilling with copper vapor lasers

Description: The authors have developed a copper vapor laser based micro machining system using advanced beam quality control and precision wavefront tilting technologies. Micro drilling has been demonstrated through percussion drilling and trepanning using this system. With a 30 W copper vapor laser running at multi-kHz pulse repetition frequency, straight parallel holes with size varying from 500 microns to less than 25 microns and with aspect ratio up to 1:40 have been consistently drilled on a variety o… more
Date: September 2, 1994
Creator: Chang, J. J.; Martinez, M. W.; Warner, B. E.; Dragon, E. P.; Huete, G. & Solarski, M. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Deflagration in Stainless Steel Storage Containers Containing Plutonium Dioxide

Description: Detonation of hydrogen and oxygen in stainless steel storage containers produces maximum pressures of 68.5 psia and 426.7 psia. The cylinders contain 3,000 g of PuO{sub 2} with 0.05 wt% and 0.5 wt% water respectively. The hydrogen and oxygen are produced by the alpha decomposition of the water. Work was performed for the Savannah River Site.
Date: February 1, 1996
Creator: Kleinschmidt, P. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Industrial applications of high-power copper vapor lasers

Description: A growing appreciation has developed in the last several years for the copper vapor laser because of its utility in ablating difficult materials at high rates. Laser ablation at high rates shows promise for numerous industrial applications such as thin film deposition, precision hole drilling, and machining of ceramics and other refractories.
Date: August 1, 1995
Creator: Warner, B. E.; Boley, C. D.; Chang, J. J.; Dragon, E. P.; Havstad, M. A.; Martinez, M. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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