Fiber Laser for ERL Zach Ulibarri Mentor: Zhi Zhao.

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Presentation transcript:

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 Light emits and repeats process

Mode Locked Lasers Saturable absorber Intensity Transmission

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

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

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

Artificial Saturable Absorber Wave plates create phase shift induced intensity modulation

Experimental Setup

Top View

Mode Locked Lasers 19.8ns

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

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

Intensity Autocorrelation

FWHM suggests pulse width = 8ps. Very large!

Chirp Index of refraction depends on wavelength Compensate with diffraction grating

Chirp

Intensity Autocorrelation

Dechirped Autocorrelation

FWHM = 330 fs = 1.5*220

Interferometric Autocorrelation FWHM suggests pulse width = 220fs

Spectrum

Simulated Results 200fs Agrees with estimates

Pulse Energy

Peak Power ChirpedDechirped

Questions?