Browsing by Author "Martin, William Eugene"

Now showing items 1-20 of 24

    • Correction for Sparks et al., Detection of circular polarization in light scattered from photosynthetic microbes [fig 1] 

      Sparks, W.B.; Hough, J.; Germer, T.A.; Chen, F.; DasSarma, S.; DasSarma, P.; Robb, F.T.; Manset, N.; Kolokolova, L.; Reid, N.; Macchetto, F.D.; Martin, William Eugene (2009-06-30)

    • Detection of circular polarization in light scattered from photosynthetic microbes 

      Sparks, W.; Hough, J.; Germer, T.A.; Chen, F.; DasSarma, S.; DasSarma, P.; Robb, F.T.; Manset, N.; Kolokolova, L.; Reid, N.; Macchetto, F.D.; Martin, William Eugene (2009-05)
      The identification of a universal biosignature that could be sensed remotely is critical to the prospects for success in the search for life elsewhere in the universe. A candidate universal biosignature is homochirality, ...

    • Direct measurement of gain recovery in a saturated Nd-glass amplifier 

      Martin, William Eugene; Milam, D. (1978)
      The temporal dependence of the gain recovery in a Nd-silicate glass amplifier has been directly observed after the passage of a short intense saturating laser pulse. The gain recovery time constant measured for ED-2 glass ...

    • Electron-beam guiding and phase-mix damping by a laser-ionized channel 

      Martin, William Eugene; Caporaso, G.J.; Fawley, W.M.; Prosnitz, D.; Cole, A.G. (1985-02)
      An ultraviolet-laser-ionized channel in low-pressure benzene has been successfully used to guide and focus a 7-kA relativistic electron beam over distances up to 4 m. In addition, phase-mix damping of coherent, transverse ...

    • Fabrication of single-crystal semiconductor optical waveguides by solid-state diffusion 

      Taylor, H.F.; Martin, William Eugene; Hall, D.B.; Smiley, V.N. (1972)
      Optical surface waveguides have been fabricated by diffusing selenium into single-crystal CdS substrates to produce graded-composition CdS Se crystals. Planar guides which confine a beam in one dimension and guides produced ...

    • Fluorescence of graded-band-gap CdSxSe1-x crystals produced by diffusion 

      Taylor, H.F.; Smiley, V.N.; Martin, William Eugene; Pawka, S.S. (1972)
      The fluorescence of CdSxSe1-x mixed crystals with band-gap gradients as large as 1200 eV/cm has been investigated at 77°K. The graded samples were produced by heating CdSe or CdSxSe1-x platelets in a sulfur-selenium ...

    • Gain saturation in Nd:doped laser materials 

      Martin, William Eugene; Milam, David (1982-07)
      Saturation of gain in Nd:doped silicate, phosphate, and fluorophosphate glasses, and in doped crystals of YAG and YLF was observed during amplification of 1064 and 1053 nm pulses with durations of 1. 0, 9. 0, and 50 ns. ...

    • Interpulse interference and passive laser pulse shapers 

      Martin, William Eugene; Milam, D. (1976-12-01)
      Passive pulse shapers including Fabry-Perot etalons, double-etalons, and classical beam splitters are examined both theoretically and experimentally for their temporal behavior. For temporally and spatially overlapped ...

    • Large aperture harmonic conversion experiments at Lawrence Livermore National Lanoratory 

      Linford, G.J.; Johnson, B.C.; Hildum, J.S.; Martin, William Eugene; Snyder, K.; Boyd, R.D.; Smith, W.L.; Vercimak, C.L.; Eimerl, D.; Hunt, J.T. (1982-10)
      Large aperture harmonic conversion experiments to 2 omega (532 nm), 3 omega (355 nm), 4 omega (266 nm) on the Argus laser at the Lawrence Livermore National Laboratory are described. Harmonically converted energies of up ...

    • Laser guiding of electron beams in the advanced test acceleration 

      Caporaso, G.J.; Rainer, F.; Martin, William Eugene; Prono, D.S.; Cole, A.G. (1986)
      The recently demonstrated technique of laser guiding has been used to propagate successfully a 10-kA relativistic electron beam 95 m through the Advanced Test Accelerator and postaccelerator beamline. The maximum transverse ...

    • A new waveguide switch/modulator for integrated optics 

      Martin, William Eugene (1975)
      A waveguide optical switch and/or modulator device is described that uses a single-mode waveguide version of the Mach-Zehnder interferometer. A mode selective branching waveguide is used for switching, and modulation can ...

    • Optical and lasing properties of fluorophosphate glass 

      Stokowski, S.E.; Martin, William Eugene; Yarema, S.M. (1980-07)
      Neodymium-doped fluorophosphate glass is a laser material newly-developed for use in high power laser fusion systems. The low refractive index (n ∼ 1.45) and low dispersion (Abbe number ∼90) of fluorophosphate glasses give ...

    • Optical rise-time measurements on KD*P transmission-line Pockels cells 

      Johnson, B.C.; Guinn, K.R.; Martin, William Eugene; Fountain, Wm.D. (1978)
      A technique has been developed for determining the optical-transmission rise times of subnanosecond switching KD*P electro-optic modulators. Optical streak-camera data with 15-psec overall resolution and 30-psec resolution ...

    • Optical waveguides by diffusion in II-VI compounds 

      Martin, William Eugene; Hall, D.B. (1972)
      Planar optical waveguides have been made by sealed ampoule diffusion of Cd and Se into ZnS and Cd into ZnSe. Three-dimensional diffused guides of Cd-diffused ZnSe have been made by using a masking layer of evaporated ...

    • Photoluminescence determinations of Cd diffusion in ZnSe 

      Martin, William Eugene (1973)
      The diffusion constant D(T) of cadmium into single-crystal zinc selenide was measured using a photoluminescence/etch technique. Diffusions were performed in sealed ampoules using cadmium metal and cadmium selenide powder ...

    • Polarized optical scattering signatures from biological materials 

      Martin, William Eugene; Hesse, E.; Hough, J.H.; Sparks, W.B.; Cockell, C.S.; Ulanowski, Z.; Germer, T.A.; Kaye, Paul H. (2010-11)
      The polarization of laser light backscattered from biological samples has been measured over the wavelength range 350-850. nm. Incident circular, linearly polarized, and unpolarized light produces significant spectral ...

    • Pulse shaping for laser fusion 

      Martin, William Eugene; Johnson, B.C.; Guinn, K.R. (1977)

    • Pulse stretching and spectroscopy of subnanosecond optical pulses using a Fabry-Perot interferometer 

      Martin, William Eugene (1977-04)
      A Fabry-Perot interferometer has been used to produce optical pulses of variable width from a short gaussian input pulse. Pulse stretching of two to five or more times the original pulse width is possible provided a longer ...

    • Refractive index profile measurements of diffused optical waveguides 

      Martin, William Eugene (1974-09-01)
      Refractive index profiles resulting from the fabrication of optical waveguides by diffusion techniques are measured using a reflection interferometric technique. In Cd-diffused ZnSe waveguides, the index variations are ...

    • Refractive index profile optimization in diffused graded index lenses 

      Martin, William Eugene (1975-10)
      Refractive index profiles resulting from simple diffusion processes in glass are calculated, and optimum choices of diffusion parameters are chosen from minimum error in approximating focusing refractive index profiles. ...