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Development of a High-Sensitivity Pump-Probe Fast Scanning Delay Line

Development of a High-Sensitivity Pump-Probe Fast Scanning Delay Line. Stephanie Majewski University of Illinois @ Urbana-Champaign University of Florida Faculty Mentor: Professor David Reitze. Introduction. Femtosecond “LASER”s Pump-Probe Spectroscopy Lock-in Method Fast-Scan System.

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Development of a High-Sensitivity Pump-Probe Fast Scanning Delay Line

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  1. Development of a High-Sensitivity Pump-Probe Fast Scanning Delay Line Stephanie Majewski University of Illinois @ Urbana-Champaign University of Florida Faculty Mentor: Professor David Reitze

  2. Introduction • Femtosecond “LASER”s • Pump-Probe Spectroscopy • Lock-in Method • Fast-Scan System

  3. Femtosecond Lasers 1 fs = 0.000 000 000 000 001 s

  4. What Happens in 100 Femtoseconds? • Light Travels 30 μm • Electrons Collide With Electrons • Solids Begin to Melt Under Laser Irradiation • Chemicals Dissociate There are about as many femtoseconds in a minute as there are minutes in the age of the universe.

  5. Project Objectives • Characterize Motion of Shaker • Design Mirror Mount • Optimize Performance of Shaker- Mount System • Implement System in Pump-Probe Experiment

  6. The “Shaker”

  7. Mirror Mount

  8. Obstacles ... • Elliptical Beam Shape • Unstable Mirror Mount • Wobble in Drive Arm of Shaker

  9. Solutions! • Uniform Bolt Force on Mirror Yielded Circular Beam Shape, Mirror Rattle Minimized • Extra Screw Added Stability to Mount • Beam Jitter Corrected Optically

  10. Time-Resolved Nanotube Transmission Measurement • Achieved successful fast-scan system implementation in pump-probe experiment • Measurement itself unsuccessful due to intrinsic scattering of sample • In future, can try using cross-polarization and other methods to reduce scattering.

  11. Conclusion • Developed Shaker Design for Fast Scanning System • Characterized Shaker Motion and Corrected Beam Jitter to Within Acceptable Limits • Implemented Shaker in Time-Resolved Carbon Nanotube Transmission Measurement

  12. Acknowledgements Professor David Reitze Mark Moores and Anatoly Efimov Drs. Kevin Ingersent and Alan Dorsey NSF Research Experience for Undergraduates

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