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Fiber Laser for ERL

Fiber Laser for ERL. Zach Ulibarri Mentor: Zhi Zhao. Introduction. Goal: Mode locked laser oscillator 50 MHz repetition rate Designed for emittance measurement. Laser Basics. Population inversion in gain medium. Laser Basics. Stimulated photon emission. Laser Basics.

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Fiber Laser for ERL

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  1. Fiber Laser for ERL Zach Ulibarri Mentor: Zhi Zhao

  2. Introduction • Goal: • Mode locked laser oscillator • 50 MHz repetition rate • Designed for emittance measurement

  3. Laser Basics • Population inversion in gain medium

  4. Laser Basics • Stimulated photon emission

  5. Laser Basics • Light emits and repeats process

  6. Mode Locked Lasers • Saturable absorber Transmission Intensity

  7. Mode Locked Lasers • With saturable absorber in place, random noise can create pulses

  8. Mode Locked Lasers • How do we add sufficient noise to the cavity?

  9. Mode Locked Lasers • How do we add sufficient noise to the cavity?

  10. Artificial Saturable Absorber • Wave plates create phase shift induced intensity modulation

  11. Experimental Setup

  12. Top View

  13. Mode Locked Lasers 19.8ns

  14. Mode Locked Lasers • Detector is too slow FWHM suggests Pulse width = 1.22 ns

  15. Autocorrelator Measurement • Michelson interferometer creates small delay • Aligned pulses create second harmonic generation

  16. Intensity Autocorrelation

  17. Intensity Autocorrelation FWHM suggests pulse width = 8ps. Very large!

  18. Chirp • Index of refraction depends on wavelength • Compensate with diffraction grating

  19. Chirp

  20. Intensity Autocorrelation

  21. Dechirped Autocorrelation

  22. Dechirped Autocorrelation FWHM = 330 fs = 1.5*220

  23. Interferometric Autocorrelation FWHM suggests pulse width = 220fs

  24. Spectrum

  25. Simulated Results Agrees with estimates 200fs

  26. Pulse Energy • Peak power estimated from pulse energy and characteristics Chirped Dechirped

  27. Peak Power Dechirped Chirped

  28. Questions?

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