Download or read book Lasers with Nuclear Pumping written by S.P. Melnikov and published by Springer. This book was released on 2014-11-27 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers the history of lasers with nuclear pumping (Nuclear Pumped Lasers, NPLs). This book showcases the most important results and stages of NPL development in The Russian Federal Nuclear Center (VNIIEF) as well as other Russian and international laboratories, including laboratories in the United States. The basic science and technology behind NPLs along with potential applications are covered throughout the book. As the first comprehensive discussion of NPLs, students, researchers, and application engineers interested in high energy lasers will find this book to be an extremely valuable source of information about these unique lasers.
Download or read book Recent Nuclear Pumped Laser Results written by and published by . This book was released on 1976 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent direct nuclear pumped laser research at the University of Illinois has concentrated on experiments with three gas mixtures (Ne-N/sub 2/, He-Ne-O/sub 2/, and He-Hg). One mixture has been made to lase and gain has been achieved with the other two. All three of these mixtures are discussed with particular attention paid to He-Hg. Of interest for DNP work is the 6150-A ion transition in Hg/sup +/. The upper state of this transition is formed directly by charge transfer and by Penning ionization.
Download or read book Nuclear pumped Lasers written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Progress in Nuclear Pumped Lasers written by and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A brief review of the historical development of nuclear pumped lasers is given. The sources available for nuclear pumping of gas lasers are mentioned. Some experimental results are briefly described.
Download or read book Direct Nuclear pumped Lasers written by N. W. Jalufka and published by . This book was released on 1983 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transient Gas Motion in Nuclear reactor pumped Lasers written by and published by . This book was released on 1991 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: In some types of nuclear-reactor-pumped lasers, the fission fragments that are used to excite gaseous lasing species heat the gas in a spatially nonuniform manner. This heating nonuniformity induces transient gas motion, which results in density and refractive-index gradients that affect the laser's optical behavior. A model of the transient gas motion is developed using the acoustic filtering methodology, which neglects the spatial variation of the pressure. This model incorporates the effect of spatially varying gas density on fission-fragment heating. Gas motion out of the laser cell into small, rapidly cooled regions is treated as a volumetric mass loss distributed over the laser cell. Although these regions have a relatively small fraction of the total volume, a large amount of gas can flow into them during the heating because of the rapid cooling therein. This gas removal from the cell during pumping, neglected in previous analyses, is important because fission-fragment heating is strongly dependent on local gas density. To quantify the laser's optical behavior, experiments are performed in which a probe laser beam is passed through the laser cell. This probe beam acquires a wavefront distortion from the refractive-index gradients and is imaged onto a wavefront slope sensor, which yields temporally and spatially resolved measurements of the angular deflection (wavefront slope) of the probe laser beam. Experimental and model results for this quantity exhibit reasonably good agreement over a wide range of pressures and heating amplitudes. 14 refs., 12 figs.
Download or read book Nuclear pumped Lasers for Large scale Applications written by and published by . This book was released on 1989 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Analysis of the 3He Ar Direct Nuclear Pumped Laser written by Creighton M. Seaford and published by . This book was released on 1979 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Hydrogen on the 585 3 nm Helium neon Nuclear pumped Laser written by Yasser Ragab Shaban and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of hydrogen as an admixture gas in the ($\sp3$He)$\sp4$He-Ne laser at the 2P$\sb1$-1S$\sb2,$ 585.3-nm Ne transition has been found to be more effective in depopulating the lower excited laser state, 1S$\sb2,$ than the use of heavy inert (noble) gases. Experimental results using the U of Illinois TRIGA reactor to pump this laser mixture at 585.3 nm feature the lowest threshold power density ever reported for visible nuclear-pumped, e-pumped and heavy ion beam-pumped lasers. The threshold neutron flux for the above transition was $1.5 \times 10\sp{13}$ n/(cm$\sp2$-sec), corresponding to threshold pumping power density 43 $\pm$ 2 mW/cm$\sp3.$ This is the second-lowest threshold power density observed for NPLs over all wavelengths, second only to the Soviet results on Ar-Xe infrared lasers (2.05 and 2.65 $\mu$m) that have a threshold power of $\sim20$ mW/cm$\sp3.$ Preceding the actual laser experiments, a series of gain experiments were carried out with various $\sp3$He:Ne:H$\sb2$ gas mixtures to guide us to the appropriate mixture ratio needed for lasing. The laser cell, 100 cm long and 1.5 cm in diameter, was fitted with a chopper fan placed in front of the rear mirror. Lasing was observed for $\sp3$He:Ne:H$\sb2$ mixture ratios 5.3:2.7:2, 5.6:2.9:1.5, and 6:3:1 with total pressures 2023, 2140, and 1928 torr respectively. Lasing was also observed for $\sp4$He:Ne:H$\sb2$ mixture ratio 2.7:5.6:1.7 with total pressure 990 torr, where lasing was pumped by a $\sp{10}$B-coated tube. A unique internal energy transfer (IET) model was developed to explain qualitatively and quantitatively the energy transfer mechanisms from the neon excited atom to the quencher atom. The IET model favors the use of open-shell atoms for faster energy transfer (quenching). The IET model suggests that the quenching of the lower excited laser level with hydrogen and argon atoms occurs at thermal energy (0.1 eV), whereas the quenching of the upper excited laser level with hydrogen and argon atoms occurs at 1.4 eV and 0.3 eV, respectively. A general kinetic model was developed, and it estimates the threshold power density to be 40 mw/cm$\sp3$ and the laser efficiency to be 1.7%. In contrast, the measured laser efficiency was found to be only 0.013% which is in good agreement with the laser efficiencies of the He-Ne-Ar, 585.3 nm reported in the USSR and at Sandia National Lab, which are 0.1% and 0.01%, respectively.
Download or read book LASL Program in Nuclear Pumped Liquid Lasers written by and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Lasers based on the lanthanide rare earths in solution show potential for production of efficient, very high energy nuclear pumped laser output. Four of the rare earth ions which appear to be highly suited for nuclear pumped lasers are Eu/sup + + +/, Tb/sup + + +/, Nd/sup + + +/, and Pm/sup + + +/. In general, these systems must be excited by external flashlamps, however, one of the results of research on optical pumping of liquid lanthanide lasers is that in some cases the addition of uranyl ions (UO2/sup + + +/) can increase the pumping efficiency. Sixty fold enhancement of the output has been observed with a mixture of UO2/sup + + +/ and Nd/sup + + +/ at 1.06 microns. Direct nuclear excitation by fission fragments in large volumes of liquids, potentially self-critical reactors, appears to be quite feasible. A brief review of the history of liquid based lanthanide ion lasers is given and future research planned at LASL is discussed.
Download or read book Direct Nuclear powered Lasers written by N. W. Jalufka and published by . This book was released on 1983 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Development of Nuclear Pumped Laser Candidate for Inertial Confinement Fusion Driver Technical Progress Report Phase 2 1989 1990 written by and published by . This book was released on 1990 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: A report is given on progress made during the second year of a three year contract studying the feasibility of nuclear pumping the atomic iodine laser. Experimental results are presented showing efficiencies of 25--38% at converting neutron-induced nuclear reaction energy in the excimer XeBr into UV photons which can be used to pump the laser. Parametric studies were done utilizing the 1°B(n, [alpha])7Li reaction, with three bromine donor chemicals, over a range of pressures and mix ratios, to optimize the fluorescence efficiency.
Download or read book Experimental Development of Nuclear Pumped Laser Candidate for Inertial Confinement Fusion Driver written by and published by . This book was released on 1990 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: A report is given on progress made during the second year of a three year contract studying the feasibility of nuclear pumping the atomic iodine laser. Experimental results are presented showing efficiencies of 25--38% at converting neutron-induced nuclear reaction energy in the excimer XeBr into UV photons which can be used to pump the laser. Parametric studies were done utilizing the 1°B(n,?)7Li reaction, with three bromine donor chemicals, over a range of pressures and mix ratios, to optimize the fluorescence efficiency.
Download or read book Analysis of High Power energy Nuclear Pumped Laser reactor Concepts written by Guoxiang Gu and published by . This book was released on 1987 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fundamental Study of Nuclear Pumped Laser Plasmas written by L. W. Downes and published by . This book was released on 1980 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although there have been many activities during the preceding report periods, this interim report will restrict itself to the theoretical prediction of a new laser amplifier process and experimental evidence for the existence of the process. This special report is being generated because this new laser processor may have significant impact on nuclear pumped lasers, as well as high power (and high energy) laser systems in general.
Download or read book Proposed Nuclear Pumped Laser Experiments Utilizing Gamma Rays written by Dennis R. Womack and published by . This book was released on 1980 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two experiments are described which use a different approach to nuclear pumped lasers. Gamma-rays will be used to attempt lasing on the C yields A transition in the XeF excimer. One experiment will use the gamma-rays to directly pump a high pressure laser mixture, and the other experiment will use gamma-rays to create photons which will in turn photolytically pump a XeF2 laser mixture. Cell design is described and first-order energy deposition calculations are presented. Predicted energy outputs from half-liter laser cells are 17.0 J for the photolytic experiment, and 1.0 J for the direct gamma experiment.
Download or read book Studies Relative to Possible Laser Pumped by Nuclear Beta Rays I Optical Spectra of LiTmF4 Doped with a Rare Earth Ion written by Clyde A. Morrison and published by . This book was released on 1973 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study has been made of the optical spectra of single-crystal LiTmF4 doped with a rare earth ion with the objective of determining the feasibility of using this material as a nuclear pumped laser. The rare earth dopant would be pumped by the beta radiation in the nuclear decay of Tm170 artifically created by bombarding the non-radioactive crystal with thermal neutrons. The optical spectra were therefore recorded before and after the crystals were irradiated by nuclear energy. The principal results of the study are as given below. (Modified author abstract).
