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Rayleigh Scattering Mapping System

AIGO. Rayleigh Scattering Mapping System. School of Physics, University of Western Australia. Australia – Italy Workshop on GW Detection 2005. AIGO. Contents:. Introduction of ARSMS Scattering mapping examples Comparisons between scattering and absorption Conclusion Acknowledgement.

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Rayleigh Scattering Mapping System

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  1. AIGO Rayleigh Scattering Mapping System School of Physics, University of Western Australia Australia – Italy Workshop on GW Detection 2005

  2. AIGO Contents: • Introduction of ARSMS • Scattering mapping examples • Comparisons between scattering and absorption • Conclusion • Acknowledgement

  3. CCD camera Sample AIGO RotationMount Laser Translation PC Stepper-motor CCD camera controller box Stepper-motor controller box Experimental Set-up • The ARSMS contains two subsystems: • Optical imaging subsystem • Mechanical motion control subsystem

  4. AIGO • Technique Parameters • Translation: • Resolution: 0.05 mm • Rotation: • Resolution: 0.3 degree (the diameter of sample is 150 mm) • Scattering sensitivity: • 0.5 ppm/cm (the laser power is 10 mw) Advantages • High resolution • 3D images • Rayleigh scattering intensity • Mapping large-size test masses

  5. AIGO Measurement and Data Processing 1 Single beam images 2 3 2D images 3D image

  6. AIGO Examples: Single images and 2D images

  7. AIGO Examples: Reconstructed 3D image Sample 2

  8. AIGO Comparisons between scattering and absorption Typical scattering and absorption[1]maps 1.The optical absorption is measured using the photothermal deflection technique at Laboratoire des Matériaux Avancés, Lyon.

  9. AIGO Comparisons between scattering and absorption • High scattering correlates with higher absorption. • Scattering structure is spatially displaced from a similar absorption structure.

  10. AIGO Correlations between scattering and absorption Absorption and scattering in sample 1: In detail there is not a clear point to point correlation between scattering and absorption.

  11. AIGO Correlations between scattering and absorption Absorption and scattering in sample 2: The spatial displacements indicate that absorption centres and scattering centres are laid down during crystal growth at different distances from the solid liquid interface.

  12. AIGO Conclusions: • 2D and 3D scattering mappings reveal different features—the inhomogeneities and the point defects. • Scattering and Absorption seem to be coming from different origins • The ARSMS can ensure that an adequate low level of scattering is achieved for gravitational wave detectors and other precision applications. • The ARSMS may provide data that can be utilized to improve the quality control of both single crystal and glass optical materials.

  13. AIGO Acknowledgement • LSC Optics Working Group • VIRGO Jean-Marie Mackowski’sGroup • Australian Research Council • ACIGA • My Supervisors • My fellow students and colleagues

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