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Hyper-Rayleigh Scattering

Hyper-Rayleigh Scattering

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  • 1. Dillon Walker, Guangyao Li, Ken Singer Hyper-Rayleigh Scattering NSF Grant DMR-0850037
  • 2. Introduction
    • Fiber-optic cables in data transmission (internet)
    • Need to switch light quickly
    • Nonlinear optical process
  • 3. Introduction to Nonlinear Optics
    • Nonlinear Effects in All Materials
    • Self-interaction of wave through matter
    • Need strong coherent light to observe
    • Laser is only good light source
    • Mode-locked Ti:Sa used in my experiment
  • 4. Hyper-Rayleigh Scattering
    • Technique for measuring second term in
    • Third Order Tensor
    • Requires non-centrosymmetric molecules
    • Frequency doubles
  • 5. Hyper-Rayleigh Scattering
    • Material dissolved in solution
    • Solutions are symmetric
    • Some incoherent scattering
    • Collected at 90 degrees
    • Very weak signal
  • 6. Multi-Photon Fluorescence
    • Photon energy may be absorbed by electron
    • Photons released as electron returns to ground state
    • May have same wavelength as Hyper-Rayleigh
  • 7. Fluorescence versus Hyper Rayleigh Hyper Rayleigh Signal Competing Multi-photon Fluorescence Instantaneous Non-Instantaneous
  • 8. Single Photon Counting Technique
    • Fluorescence is not instantaneous
    • Time-Resolved Single Photon Counting can be used to distinguish between the two
    • Requires thousands of pulses for accuracy
  • 9. Single-Photon Counting Technique
    • Single-Photon detectors have a dead time after each photon detection.
    • Can use sync to build a histogram of photon detections after each pulse
    • Only works for low detection probabilities
    2% Chromophore1 in Acetone
  • 10. Setup Photomultiplier PC Photo-detector Sample Beam-splitter Titanium: Sapphire Pump Laser