Abstract

We have measured 527-nm absorption for induced spatial incoherence (ISI) and non-ISI illumination of high-Z targets over the 0.5–3.5 × 1014-W/cm2 laser intensity range using energy balance with a custom designed 30-cm diam light integrating sphere. Induced spatial incoherence of the laser beam was produced by inserting echelons in the beam path and operating the laser at wide bandwidth (0.2%). To produce ISI and non-ISI data for comparison, we irradiated a large number of 180-μm diam gold disks with 0.5–1.5-ns pulses with echelons in the beam path with and without wide laser bandwidths. Our data show an increase in absorption of 5–11% for the ISI illuminated targets and also suggest a weaker dependence of absorption on laser intensity for ISI illumination than for non-ISI.

© 1990 Optical Society of America

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  1. R. H. Lehmberg, S. P. Obenschain, “Use of Induced Spatial Incoherence for Uniform Illumination of Laser Fusion Targets,” Opt. Commun. 46, 27–31 (1983).
    [CrossRef]
  2. S. P. Obenschain et al., “Laser–Target Interaction with Induced Spatial Incoherence,” Phys. Rev. Lett. 56, 2807–2809 (1986).
    [CrossRef] [PubMed]
  3. A. N. Mostovych et al., “Brillouin-Scattering Measurements from Plasmas Irradiated with Spatially and Temporally Incoherent Laser Light,” Phys. Rev. Lett. 59, 1193–1196 (1987).
    [CrossRef] [PubMed]
  4. D. R. Kania, P. Bell, S. P. Obenschain, “Effects of ISI on the Interaction of 1.05 μm Light with High Z Plasmas,” Proc. Soc. Photo-Opt. Instrum. Eng. 913, 98 (1988).
  5. J. D. Simpson, D. J. Drake, T. Speziale, “Light-Integrating Cylinder for ICF Light Balance Measurements in Mirror Illumination Systems,” Rev. Sci. Instrum. 57, 2951–2956 (1986).
    [CrossRef]
  6. J. P. Anthes, M. A. Palmer, M. A. Gusinow, M. D. Matzen, “Absorption of Laser Radiation by Al, Fe, and Au Planar Metallic Targets,” Appl. Phys. Lett. 34, 841–843 (1979).
    [CrossRef]
  7. R. P. Godwin, R. Sachsenmaier, R. Sigel, “Angle-Dependent Reflectance of Laser-Produced Plasmas,” Phys. Rev. Lett. 39, 1198–1201 (1977).
    [CrossRef]
  8. R. Kristal, “Surface Plasma Absorption in an Integrating Sphere at High Optical Flux Levels,” Appl. Opt. 21, 1885–1887 (1982).
    [CrossRef] [PubMed]
  9. Catalog LBS-004, Labsphere, Inc., P.O. Box 70, North Sutton, NH 03260.

1988 (1)

D. R. Kania, P. Bell, S. P. Obenschain, “Effects of ISI on the Interaction of 1.05 μm Light with High Z Plasmas,” Proc. Soc. Photo-Opt. Instrum. Eng. 913, 98 (1988).

1987 (1)

A. N. Mostovych et al., “Brillouin-Scattering Measurements from Plasmas Irradiated with Spatially and Temporally Incoherent Laser Light,” Phys. Rev. Lett. 59, 1193–1196 (1987).
[CrossRef] [PubMed]

1986 (2)

S. P. Obenschain et al., “Laser–Target Interaction with Induced Spatial Incoherence,” Phys. Rev. Lett. 56, 2807–2809 (1986).
[CrossRef] [PubMed]

J. D. Simpson, D. J. Drake, T. Speziale, “Light-Integrating Cylinder for ICF Light Balance Measurements in Mirror Illumination Systems,” Rev. Sci. Instrum. 57, 2951–2956 (1986).
[CrossRef]

1983 (1)

R. H. Lehmberg, S. P. Obenschain, “Use of Induced Spatial Incoherence for Uniform Illumination of Laser Fusion Targets,” Opt. Commun. 46, 27–31 (1983).
[CrossRef]

1982 (1)

1979 (1)

J. P. Anthes, M. A. Palmer, M. A. Gusinow, M. D. Matzen, “Absorption of Laser Radiation by Al, Fe, and Au Planar Metallic Targets,” Appl. Phys. Lett. 34, 841–843 (1979).
[CrossRef]

1977 (1)

R. P. Godwin, R. Sachsenmaier, R. Sigel, “Angle-Dependent Reflectance of Laser-Produced Plasmas,” Phys. Rev. Lett. 39, 1198–1201 (1977).
[CrossRef]

Anthes, J. P.

J. P. Anthes, M. A. Palmer, M. A. Gusinow, M. D. Matzen, “Absorption of Laser Radiation by Al, Fe, and Au Planar Metallic Targets,” Appl. Phys. Lett. 34, 841–843 (1979).
[CrossRef]

Bell, P.

D. R. Kania, P. Bell, S. P. Obenschain, “Effects of ISI on the Interaction of 1.05 μm Light with High Z Plasmas,” Proc. Soc. Photo-Opt. Instrum. Eng. 913, 98 (1988).

Drake, D. J.

J. D. Simpson, D. J. Drake, T. Speziale, “Light-Integrating Cylinder for ICF Light Balance Measurements in Mirror Illumination Systems,” Rev. Sci. Instrum. 57, 2951–2956 (1986).
[CrossRef]

Godwin, R. P.

R. P. Godwin, R. Sachsenmaier, R. Sigel, “Angle-Dependent Reflectance of Laser-Produced Plasmas,” Phys. Rev. Lett. 39, 1198–1201 (1977).
[CrossRef]

Gusinow, M. A.

J. P. Anthes, M. A. Palmer, M. A. Gusinow, M. D. Matzen, “Absorption of Laser Radiation by Al, Fe, and Au Planar Metallic Targets,” Appl. Phys. Lett. 34, 841–843 (1979).
[CrossRef]

Kania, D. R.

D. R. Kania, P. Bell, S. P. Obenschain, “Effects of ISI on the Interaction of 1.05 μm Light with High Z Plasmas,” Proc. Soc. Photo-Opt. Instrum. Eng. 913, 98 (1988).

Kristal, R.

Lehmberg, R. H.

R. H. Lehmberg, S. P. Obenschain, “Use of Induced Spatial Incoherence for Uniform Illumination of Laser Fusion Targets,” Opt. Commun. 46, 27–31 (1983).
[CrossRef]

Matzen, M. D.

J. P. Anthes, M. A. Palmer, M. A. Gusinow, M. D. Matzen, “Absorption of Laser Radiation by Al, Fe, and Au Planar Metallic Targets,” Appl. Phys. Lett. 34, 841–843 (1979).
[CrossRef]

Mostovych, A. N.

A. N. Mostovych et al., “Brillouin-Scattering Measurements from Plasmas Irradiated with Spatially and Temporally Incoherent Laser Light,” Phys. Rev. Lett. 59, 1193–1196 (1987).
[CrossRef] [PubMed]

Obenschain, S. P.

D. R. Kania, P. Bell, S. P. Obenschain, “Effects of ISI on the Interaction of 1.05 μm Light with High Z Plasmas,” Proc. Soc. Photo-Opt. Instrum. Eng. 913, 98 (1988).

S. P. Obenschain et al., “Laser–Target Interaction with Induced Spatial Incoherence,” Phys. Rev. Lett. 56, 2807–2809 (1986).
[CrossRef] [PubMed]

R. H. Lehmberg, S. P. Obenschain, “Use of Induced Spatial Incoherence for Uniform Illumination of Laser Fusion Targets,” Opt. Commun. 46, 27–31 (1983).
[CrossRef]

Palmer, M. A.

J. P. Anthes, M. A. Palmer, M. A. Gusinow, M. D. Matzen, “Absorption of Laser Radiation by Al, Fe, and Au Planar Metallic Targets,” Appl. Phys. Lett. 34, 841–843 (1979).
[CrossRef]

Sachsenmaier, R.

R. P. Godwin, R. Sachsenmaier, R. Sigel, “Angle-Dependent Reflectance of Laser-Produced Plasmas,” Phys. Rev. Lett. 39, 1198–1201 (1977).
[CrossRef]

Sigel, R.

R. P. Godwin, R. Sachsenmaier, R. Sigel, “Angle-Dependent Reflectance of Laser-Produced Plasmas,” Phys. Rev. Lett. 39, 1198–1201 (1977).
[CrossRef]

Simpson, J. D.

J. D. Simpson, D. J. Drake, T. Speziale, “Light-Integrating Cylinder for ICF Light Balance Measurements in Mirror Illumination Systems,” Rev. Sci. Instrum. 57, 2951–2956 (1986).
[CrossRef]

Speziale, T.

J. D. Simpson, D. J. Drake, T. Speziale, “Light-Integrating Cylinder for ICF Light Balance Measurements in Mirror Illumination Systems,” Rev. Sci. Instrum. 57, 2951–2956 (1986).
[CrossRef]

Appl. Opt. (1)

Appl. Phys. Lett. (1)

J. P. Anthes, M. A. Palmer, M. A. Gusinow, M. D. Matzen, “Absorption of Laser Radiation by Al, Fe, and Au Planar Metallic Targets,” Appl. Phys. Lett. 34, 841–843 (1979).
[CrossRef]

Opt. Commun. (1)

R. H. Lehmberg, S. P. Obenschain, “Use of Induced Spatial Incoherence for Uniform Illumination of Laser Fusion Targets,” Opt. Commun. 46, 27–31 (1983).
[CrossRef]

Phys. Rev. Lett. (3)

S. P. Obenschain et al., “Laser–Target Interaction with Induced Spatial Incoherence,” Phys. Rev. Lett. 56, 2807–2809 (1986).
[CrossRef] [PubMed]

A. N. Mostovych et al., “Brillouin-Scattering Measurements from Plasmas Irradiated with Spatially and Temporally Incoherent Laser Light,” Phys. Rev. Lett. 59, 1193–1196 (1987).
[CrossRef] [PubMed]

R. P. Godwin, R. Sachsenmaier, R. Sigel, “Angle-Dependent Reflectance of Laser-Produced Plasmas,” Phys. Rev. Lett. 39, 1198–1201 (1977).
[CrossRef]

Proc. Soc. Photo-Opt. Instrum. Eng. (1)

D. R. Kania, P. Bell, S. P. Obenschain, “Effects of ISI on the Interaction of 1.05 μm Light with High Z Plasmas,” Proc. Soc. Photo-Opt. Instrum. Eng. 913, 98 (1988).

Rev. Sci. Instrum. (1)

J. D. Simpson, D. J. Drake, T. Speziale, “Light-Integrating Cylinder for ICF Light Balance Measurements in Mirror Illumination Systems,” Rev. Sci. Instrum. 57, 2951–2956 (1986).
[CrossRef]

Other (1)

Catalog LBS-004, Labsphere, Inc., P.O. Box 70, North Sutton, NH 03260.

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