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in subjects: "Harmonic Generation"  
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Kinetics of the [beta]-[delta]phase transition in PBX9501.

Description: The initial step in the thermal decomposition of HMX is the solid state phase transition from the centrosymmetric beta form to the noncentrosymmetric delta form. The symmetry change makes the phase transition amenable to the application of second harmonic generation (SHG) as a probe of transition kinetics. We have used SHG to study the temperature dependence of the kinetics for unconfined PBX9501 and HMX. Spatially resolved SHG measurements have shown a nucleation and growth mechanism for the s… more
Date: January 1, 2001
Creator: Smilowitz, L. B. (Laura B.); Henson, B. F. (Bryan F.); Asay, B. W. (Blaine W.); Dickson, P. M. (Peter M.) & Robinson, J. M. (Jeanne M.)
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Partner: UNT Libraries Government Documents Department
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Control of visible harmonic generation using polarization in photonic crystal fibers

Description: The polarization state of the input pulses to a segment of microstructured fiber controls the harmonic generation yielding specific frequencies depending on of the input state.
Date: January 1, 2001
Creator: Omenetto, F. G. (Fiorenzo G.); Efimov, A. V. (Anatoly V.); Taylor, Antoinette J.,; Knight, J. C. (Jonathan C.); Wadsworth, W. J. (William J.) & Russell, P. S. J. (Philip St. J.)
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Partner: UNT Libraries Government Documents Department
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Measurement of the Second Order Non-linear Susceptibility of Collagen using Polarization Modulation and Phase-sensitive Detection

Description: The measurement of the second order nonlinear susceptibility of collagen in various biological tissues has potential applications in the detection of structural changes which are related to different pathological conditions. We investigate second harmonic generation in rat-tail tendon, a highly organized collagen structure consisting of parallel fibers. Using an electro-optic modulator and a quarter-wave plate, we modulate the linear polarization of an ultra-short pulse laser beam that is used … more
Date: March 3, 2001
Creator: Stoller, P.; Kim, B. M.; Rubenchik, A. M.; Reiser, K. M. & Da Silva, L. B.
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Partner: UNT Libraries Government Documents Department
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Second Order Optical Nonlinearities in Thermally Poled Phosphate Glasses

Description: Second order optical nonlinearities were induced in commercial phosphate glasses (Schott, IOG-1) by the thermal poling technique. The induced {chi}{sup (2)} was measured via second harmonic generation using a fundamental beam from a 1064 nm mode-locked Nd:YAG laser. The nonlinear regions were characterized using the Maker-Fringe technique, in which the second harmonic signals were observed as a function of incident angle of the fundamental beam. The results show that the {chi}{sup (2)} profile … more
Date: December 14, 2001
Creator: Thamboon, P & Krol, D
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Partner: UNT Libraries Government Documents Department
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High Gain Harmonic Generation X-Ray Free Electron Laser

Description: We present the calculation on the performance of a High Gain Harmonic Generation (HGHG) X-ray Free Electron Laser (FEL) based on the high quality electron beam from the proposed Photoinjected Energy Recovery Linac (PERL) at the NSLS. We consider several sets of e-beam parameters. The calculation indicates that it is possible to produce a fully coherent FEL with a wavelength around 10 Angstrom, with a peak power of several GW. The high order harmonics will also be produced with a significant amo… more
Date: June 18, 2001
Creator: Wu, J. & Yu, L. H.
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Partner: UNT Libraries Government Documents Department
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High Gain Harmonic Generation UV to DUV Free Electron Lasers at the NSLS.

Description: In this paper, we present the calculation on the performance of High Gain Harmonic Generation (HGHG) UV to DUV Free Electron Lasers (FELs) at the NSLS. Based on the beam quality and the available undulators at the NSLS, the calculation shows that it is possible to produce fully coherent DUV FEL down to 500 Angstrom, with a peak power of several hundred Mega Watts. One further attractive feature is the possibility to produce ultra short radiation pulse based on such HGHG scheme.
Date: June 18, 2001
Creator: Wu, J. & Yu, L. H.
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Partner: UNT Libraries Government Documents Department
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Optical spectroscopy of strongly correlated electron systems

Description: In this thesis, both time-resolved, nonlinear optical spectroscopy and linear spectroscopy are used to investigate the interactions and dynamics of elementary excitations in strongly correlated electron systems. In the first part, we investigate the renormalization of magnetic elementary excitations in the transition metal oxide Cr{sub 2}O{sub 3}. We have created a non-equilibrium population of antiferromagnetic spin waves and characterized its dynamics, using frequency- and time-resolved optic… more
Date: February 27, 2001
Creator: Schumacher, Andreas B.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
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The DUV-FEL Development Program

Description: We discuss the design and output radiation parameters for the Deep Ultra-violet Free Electron Laser at BNL, which will generate coherent output down to 100 nm using High Gain Harmonic Generation. The result of FEL calculation and the status of the experiment are presented.
Date: June 18, 2001
Creator: Yu, L. H.; Dimauro, L. F.; Doyuran, A.; Graves, W.; Johnson, E.; Krinsky, S. et al.
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Partner: UNT Libraries Government Documents Department
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Using Simultaneous SHG and XRD Capabilities to Examine Phase Transitions of HMX and TATB

Description: Simultaneous SHG (second harmonic generation) and XRD (x-ray diffraction) capabilities have been developed at SSRL (Stanford Synchrotron Radiation laboratory) to examine the phase behavior of energetic materials, for example, HMX (octahydro- 1,3,5,7-tetranitro- 1,3,5,7-tetrmcine) and TATB (1,3,5-triamino-2,4,6 trinitrobenzene). This unique capability provides information on the evolution at the molecular level (centro and non-centrosymmetric) on material stability, phase transformation or decom… more
Date: June 19, 2001
Creator: Saw, C. K.; Zaug, J.; Farber, D. & Ruddle, C.
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Partner: UNT Libraries Government Documents Department
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