rayleigh scattering mapping system school of physics, university of western australia australia –...
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Rayleigh Scattering Mapping System
School of Physics, University of Western Australia
Australia – Italy Workshop on GW Detection 2005
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Contents:
1.Introduction of ARSMS2.Scattering mapping examples3.Comparisons between scattering and absorption4.Conclusion5.Acknowledgement
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Stepper-motor controller box
CCD camera controller box
CCD camera
Translation
Rotation Mount
Laser
Sample
Stepper-motor
PC
Experimental Set-up
The ARSMS contains two subsystems: •Optical imaging subsystem•Mechanical motion control subsystem
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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
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Measurement and Data Processing
Single beam images
2D images
3D image
13
2
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Single images and 2D images
Examples:
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Reconstructed 3D image
Examples:
Sample 2
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1.The optical absorption is measured using the photothermal deflection technique at Laboratoire des Matériaux Avancés, Lyon.
Typical scattering and absorption[1] maps
Comparisons between scattering and absorption
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Comparisons between scattering and absorption
•High scattering correlates with higher absorption. •Scattering structure is spatially displaced from a similar absorption structure.
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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.
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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.
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•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.
Conclusions:
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Acknowledgement
•LSC Optics Working Group•VIRGO Jean-Marie Mackowski’s Group•Australian Research Council•ACIGA•My Supervisors•My fellow students and colleagues