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28 results on '"Bayramian, Andy"'

1. Fusion-Fission Blanket Options for the LIFE Engine

Author

Kramer, Kevin J, Fratoni, Massimiliano, Latkowski, Jeffery F, Abbott, Ryan P, Anklam, Thomas M, Beckett, Elizabeth M, Bayramian, Andy J, DeMuth, James A, Deri, Robert J, De La Rubia, Tomas Diaz, Dunne, A Mike, El-dasher, Bassem S, Farmer, Joseph C, Lafuente, Antonio, Meier, Wayne R, Moir, Ralph W, Morris, Kevin L, Moses, Edward I, Powers, Jeffrey J, Reyes, Susana, Sawicki, Richard H, Seifried, Jeffrey E, Storm, Erik, and Taylor, Janine M

Subjects
Affordable and Clean Energy, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Energy
Published
2011

2. Large area, multi-pulse laser lifetime of purified nematic liquid crystals at near infrared wavelengths

Author

Elhadj, Selim, primary, Garvin, Craig, additional, Bayramian, Andy, additional, Clauson, William, additional, Murachver, Matthew, additional, Jarboe, Jeff, additional, Kissinger, Drew, additional, LeBlanc, Cote, additional, Urban, Nathaniel D., additional, Wallace, Jason U., additional, Demos, Stavros G., additional, and Marshall, Kenneth L., additional

Published
2021
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3. Understanding fifth-harmonic generation in CLBO

Author

Patankar, Siddharth, primary, Yang, Steven T., primary, Ross, Steven J., primary, Moody, John D., primary, Swadling, George F., primary, Bayramian, Andy, primary, Barker, David, primary, Datte, Philip S., primary, Bromage, Jake, primary, Begishev, Ildar A., primary, Norton, Mary, primary, Carr, Christopher W., primary, and Mennerat, Gabriel, primary

Published
2018
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4. Scaling High Intensity Laser Systems from State-of-the-Art to MW Class Enabling Next Generation Light Sources

Author

Bayramian, Andy J., primary, Alessi, David, additional, Chen, Diana, additional, Chesnut, Kyle, additional, Erlandson, Alvin, additional, Galvin, Thomas, additional, Mason, Dan, additional, Nguyen, Hoang, additional, Rehak, Margareta, additional, Rosso, Paul, additional, Schaffers, Kathleen, additional, Siders, Craig, additional, Sistrunk, Emily F., additional, Spinka, Thomas, additional, and Haefner, Constantin L., additional

Published
2018
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5. Consideration of stimulated Raman scattering in Yb:[Sr.sub.5][([PO.sub.4]).sub.3]F laser amplifiers

Author

Bayramian, Andy J., Bibeau, Camille, Beach, Raymond J., Marshall, Christopher D., and Payne, Stephen A.

Subjects
Raman effect -- Measurement, Optics, Physical -- Analysis, Optoelectronics -- Research, Laser beams -- Diffraction, Astronomy, Physics
Abstract

The stimulated Raman-scattering (SRS) gain coefficient has been measured quantitatively for the first time to our knowledge in Yb:[Sr.sub.5][([PO.sub.4]).sub.3]F to be 1.23 [+ or -] 0.12 cm/GW at 1053 nm. These data, along with surface and bulk losses, feedback that is due to surface reflections, gain saturation, and bandwidth, have been applied to a quantitative model that predicts the effects of SRS within a laser amplifier system where the laser gain media show SRS gain. Limitations and impact to the laser amplifier performance are discussed, along with possible techniques to reduce SRS loss. [C] 2000 Optical Society of America OCIS codes: 290.5910, 140.4480, 190.5890, 160.3380, 190.5650.

Published
2000

6. Gain saturation measurements of ytterbium-doped [Sr.sub.5][([PO.sub.4]).sub.3]F

Author

Bayramian, Andy J., Bibeau, Camille, Schaffers, Kathleen I., Marshall, Christopher D., and Payne, Steve A.

Subjects
Mathematical models -- Analysis, Optics -- Research, Astronomy, Physics
Abstract

We report on the experimental measurement of the saturated gain of [Yb.sup.3+]:[Sr.sub.5] [([PO.sub.4]).sub.3]F at the 1047-nm laser line as a function of pump fluence and probe energy. The emission line was accurately modeled as a single homogeneous extraction, yielding values of 6.2 x [10.sup.-20] [cm.sup.2] for the emission cross section and 3.3 J/[cm.sup.2] for the saturation fluence. [C] 2000 Optical Society of America OCIS codes: 140.3380, 140.3280, 300.2140.

Published
2000

9. Overview of Mono-energetic Gamma-ray Sources Applications

Author

Hartemann, Fred, Albert, Felicie, Anderson, Scott, Barty, Christopher, Bayramian, Andy, Chu, Tak Sum, Cross, R., Ebbers, Christopher, Gibson, David, Jongewaard, Erik, Marsh, Roark, McNabb, Dennis, Messerly, Michael, Raubenheimer, Tor, Semenov, Vladimir, Shverdin, Miroslav, Siders, Craig, Tantawi, Sami, and Vlieks, Arnold

Subjects
Astrophysics::High Energy Astrophysical Phenomena, Physics::Accelerator Physics, 02 Synchrotron Light Sources and FELs, A14 Advanced Concepts, Accelerator Physics
Abstract

Recent progress in accelerator physics and laser technology have enabled the development of a new class of tunable gamma-ray light sources based on Compton scattering between a high-brightness, relativistic electron beam and a high intensity laser pulse produced via chirped-pulse amplification (CPA). A precision, tunable Mono-Energetic Gamma-ray (MEGa-ray) source driven by a compact, high-gradient X-band linac is currently under development and construction at LLNL. High-brightness, relativistic electron bunches produced by an X-band linac designed in collaboration with SLAC will interact with a Joule-class, 10 ps, diode-pumped CPA laser pulse to generate tunable γ-rays in the 0.5-2.5 MeV photon energy range via Compton scattering. This MEGa-ray source will be used to excite nuclear resonance fluorescence in various isotopes. Applications include homeland security, stockpile science and surveillance, nuclear fuel assay, and waste imaging and assay. The source design, key parameters, and current status are presented, along with important applications, including nuclear resonance fluorescence, photo-fission, and medical imaging., Proceedings of the 1st International Particle Accelerator Conference, IPAC2010, Kyoto, Japan

Published
2010
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10. Laser Technology for Precision Monoenergetic Gamma-ray Source R at LLNL

Author

Shverdin, Miroslav, Albert, Felicie, Anderson, Scott, Barty, Christopher, Bayramian, Andy, Betts, Shawn, Chu, Tak Sum, Ebbers, Christopher, Gibson, David, Hartemann, Fred, Marsh, Roark, McNabb, Dennis, Messerly, Michael, Phan, Henry, Prantil, Matthew, Siders, Craig, and Wu, Sheldon

Subjects
07 Accelerator Technology, Physics::Accelerator Physics, Physics::Optics, T24 Lasers, Physics::Atomic Physics, Accelerator Physics
Abstract

Generation of mono-energetic, high brightness gamma-rays requires state of the art lasers to both produce a low emittance electron beam in the linac and high intensity, narrow linewidth laser photons for scattering with the relativistic electrons. Here, we overview the laser systems for the 3rd generation Monoenergetic Gamma-ray Source (MEGa-ray) currently under construction at Lawrence Livermore National Lab. We also describe a method for increasing the efficiency of laser Compton scattering through laser pulse recirculation. The fiber-based photoinjector laser will produce 50 uJ temporally and spatially shaped UV pulses at 120 Hz to generate a low emmittance electron beam in the X-band RF photoinjector. The interaction laser generates high intensity photons that focus into the interaction region and scatter off the accelerated electrons. This system utilizes chirped pulse amplification and commercial diode pumped solid state Nd:YAG amplifiers to produce 0.5 J, 10 ps, 120 Hz pulses at 1064 nm and up to 0.2 J after frequency doubling. A single passively mode-locked Ytterbium fiber oscillator seeds both laser systems and provides a timing synch with the linac., Proceedings of the 1st International Particle Accelerator Conference, IPAC2010, Kyoto, Japan

Published
2010
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13. Nd:Glass Laser Design for Laser ICF Fission Energy (LIFE)

Author

Caird, John, primary, Agrawal, Vivek, additional, Bayramian, Andy, additional, Beach, Ray, additional, Britten, Jerry, additional, Chen, Diana, additional, Cross, Robert, additional, Ebbers, Christopher, additional, Erlandson, Alvin, additional, Feit, Michael, additional, Freitas, Barry, additional, Ghosh, Chuni, additional, Haefner, Constantin, additional, Homoelle, Doug, additional, Ladran, Tony, additional, Latkowski, Jeff, additional, Molander, William, additional, Murray, John, additional, Rubenchik, Sasha, additional, Schaffers, Kathleen, additional, Siders, Craig, additional, Stappaerts, Eddy, additional, Sutton, Steve, additional, Telford, Steve, additional, Trenholme, John, additional, and Barty, Christopher, additional

Published
2009
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14. High-average-power femto-petawatt laser pumped by the Mercury laser facility

Author

Bayramian, Andy, primary, Armstrong, James, additional, Beer, Glenn, additional, Campbell, Rob, additional, Chai, Bruce, additional, Cross, Robert, additional, Erlandson, Alvin, additional, Fei, Yting, additional, Freitas, Barry, additional, Kent, Robert, additional, Menapace, Joseph, additional, Molander, William, additional, Schaffers, Kathleen, additional, Siders, Craig, additional, Sutton, Steve, additional, Tassano, John, additional, Telford, Steve, additional, Ebbers, Christopher, additional, Caird, John, additional, and Barty, Christopher, additional

Published
2008
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15. Laser-induced bulk damage in Yb:S-FAP crystals

Author

Liao, Zhi M., primary, Adams, John J., additional, Jarboe, Jeff, additional, Menapace, Joe, additional, Nielsen, Norm, additional, Schrauth, Sam, additional, Wolfe, Justin, additional, Erlandson, Al, additional, Schaffers, Kathleen, additional, Stolz, Christopher, additional, Bayramian, Andy, additional, and Carid, John, additional

Published
2006
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18. Initial operation of the mercury laser: a gas-cooled 10-Hz Yb:S-FAP system.

Author

Bibeau, Camille M., Bayramian, Andy J., Beach, Raymond J., Campbell, Robert W., DeWald, Adrian, Davis, Wilburt H., Dawson, Jay W., DiMercurio, Larain E., Ebbers, Christopher A., Freitas, Barry L., Hill, Michael R., Hood, Kevin M., Kanz, V. Keith, Menapace, Joseph A., Payne, Stephen A., Randles, Mark H., Rankin, Jon E., Schaffers, Kathleen I., Stoltz, Christopher J., and Tassano, John B.

Published
2004
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21. Characterization of Yb3+:Sr(sub 5-x)Ba(sub x)(PO(sub 4))(sub 3)F crystals for diode-pumped lasers

Author

Bayramian, Andy J., Marshall, Christopher D., Schaffers, Kathleen I., and Payne, Stephen A.

Subjects
Diodes, Laser -- Research, Crystals -- Research, Lasers -- Research, Business, Computers, Electronics, Electronics and electrical industries
Abstract

A study was conducted to analyze the absorption and emission bands of ytterbium-doped Sr(sub 5-x)Ba(sub x)(PO4)3F crystals for diode-pumped lasers. The absorption feature's homogeneity was examined using a tunable pump source. The importance of emission bandwidth in considering materials for chirped pulse amplification was then discussed. Results indicated that broader absorption bandwidth improves the coupling of pump sources.

Published
1999

27. Characterization of Yb3+:Sr5-xBax(PO4)3F crystals for diode-pumped lasers.

Author

Bayramian, Andy J. and Marshall, Christopher D.

Subjects
*LASERS, *CRYSTAL growth, *YTTERBIUM
Abstract

Investigates the usefulness of ytterbium-doped crystals for diode-pumped lasers. Bandwidth increases for emission spectra with barium content; Enhancement of the ability to couple pump sources; Basic spectroscopic properties of the ytterbium-doped crystals.

Published
1999
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