Mode-locked Fiber Lasers for Ultrafast Electron Diffraction Experiments

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Description
"This thesis documents the design and construction of two pulsed fiber lasers that could be used in ultrafast electron diffraction experiments. A mode-locked stretched-pulse fiber oscillator using erbium-doped fiber produces approximately 100 pJ pulses with transform-limited pulse durations of less than 100 fs at a repetition rate of 35.0 MHz. Preliminary pulse characterizations in the time-domain are enabled by a recently assembled frequency-resolved optical gating setup, and we predict that positively chirped pulses are coupled out of the cavity with durations of about 920 fs. We also present the simulation and construction of a dissipative soliton fiber oscillator made with ytterbium-doped fiber. We demonstrate mode-locking at a repetition rate 42.7 MHz and measure pulses with 3.5 nJ pulse energies and transform-limited pulse durations of 180 fs. The pulses are expected to be positively chirped and to have durations on the order of a few ps. Finally, we present the design and simulation of a fiber laser amplifier that can be seeded by the dissipative soliton oscillator for the production of 2 µJ pulses that are compressible to sub-200 fs durations for future pump-probe electron diffraction experiments."

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